9c5ad80efd
PR libstdc++/69293 * include/std/functional (_Function_base::_M_not_empty_function): Change overloads for pointers to take arguments by value. * testsuite/20_util/function/cons/57465.cc: Add tests for pointer-to-member cases. From-SVN: r232504
2247 lines
69 KiB
C++
2247 lines
69 KiB
C++
// <functional> -*- C++ -*-
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// Copyright (C) 2001-2016 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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* Copyright (c) 1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*/
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/** @file include/functional
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_FUNCTIONAL
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#define _GLIBCXX_FUNCTIONAL 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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#include <bits/stl_function.h>
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#if __cplusplus >= 201103L
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#include <typeinfo>
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#include <new>
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#include <tuple>
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#include <type_traits>
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#include <bits/functexcept.h>
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#include <bits/functional_hash.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename _MemberPointer>
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class _Mem_fn;
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template<typename _Tp, typename _Class>
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_Mem_fn<_Tp _Class::*>
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mem_fn(_Tp _Class::*) noexcept;
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/// If we have found a result_type, extract it.
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template<typename _Functor, typename = __void_t<>>
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struct _Maybe_get_result_type
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{ };
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template<typename _Functor>
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struct _Maybe_get_result_type<_Functor,
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__void_t<typename _Functor::result_type>>
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{ typedef typename _Functor::result_type result_type; };
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/**
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* Base class for any function object that has a weak result type, as
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* defined in 20.8.2 [func.require] of C++11.
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*/
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template<typename _Functor>
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struct _Weak_result_type_impl
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: _Maybe_get_result_type<_Functor>
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{ };
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/// Retrieve the result type for a function type.
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes...)>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes......)>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes...) const>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes......) const>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>
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{ typedef _Res result_type; };
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/// Retrieve the result type for a function reference.
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>
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{ typedef _Res result_type; };
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/// Retrieve the result type for a function pointer.
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
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{ typedef _Res result_type; };
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template<typename _Res, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>
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{ typedef _Res result_type; };
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/// Retrieve result type for a member function pointer.
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
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{ typedef _Res result_type; };
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>
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{ typedef _Res result_type; };
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/// Retrieve result type for a const member function pointer.
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
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{ typedef _Res result_type; };
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>
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{ typedef _Res result_type; };
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/// Retrieve result type for a volatile member function pointer.
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
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{ typedef _Res result_type; };
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>
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{ typedef _Res result_type; };
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/// Retrieve result type for a const volatile member function pointer.
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)
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const volatile>
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{ typedef _Res result_type; };
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template<typename _Res, typename _Class, typename... _ArgTypes>
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struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)
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const volatile>
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{ typedef _Res result_type; };
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/**
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* Strip top-level cv-qualifiers from the function object and let
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* _Weak_result_type_impl perform the real work.
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*/
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template<typename _Functor>
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struct _Weak_result_type
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: _Weak_result_type_impl<typename remove_cv<_Functor>::type>
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{ };
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template<typename _Tp, typename _Up = typename decay<_Tp>::type>
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struct _Unwrap
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{
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using type = _Tp&&;
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// Equivalent to std::forward<_Tp>
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static constexpr _Tp&&
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_S_fwd(_Tp& __t) noexcept { return static_cast<_Tp&&>(__t); }
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};
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template<typename _Tp, typename _Up>
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struct _Unwrap<_Tp, reference_wrapper<_Up>>
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{
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using type = _Up&;
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// Get an lvalue-reference from a reference_wrapper.
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static _Up&
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_S_fwd(const _Tp& __t) noexcept { __t.get(); }
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};
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// Used by __invoke_impl instead of std::forward<_Tp> so that a
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// reference_wrapper is converted to an lvalue-reference.
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template<typename _Tp>
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inline typename _Unwrap<_Tp>::type
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__invfwd(typename remove_reference<_Tp>::type& __t) noexcept
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{ return _Unwrap<_Tp>::_S_fwd(__t); }
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template<typename _Res, typename _Fn, typename... _Args>
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inline _Res
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__invoke_impl(__invoke_other, _Fn&& __f, _Args&&... __args)
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noexcept(noexcept(std::forward<_Fn>(__f)(std::forward<_Args>(__args)...)))
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{ return std::forward<_Fn>(__f)(std::forward<_Args>(__args)...); }
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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inline _Res
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__invoke_impl(__invoke_memfun_ref, _MemFun&& __f, _Tp&& __t,
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_Args&&... __args)
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noexcept(noexcept(
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(__invfwd<_Tp>(__t).*__f)(std::forward<_Args>(__args)...)))
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{ return (__invfwd<_Tp>(__t).*__f)(std::forward<_Args>(__args)...); }
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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inline _Res
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__invoke_impl(__invoke_memfun_deref, _MemFun&& __f, _Tp&& __t,
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_Args&&... __args)
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noexcept(noexcept(
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((*std::forward<_Tp>(__t)).*__f)(std::forward<_Args>(__args)...)))
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{
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return ((*std::forward<_Tp>(__t)).*__f)(std::forward<_Args>(__args)...);
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}
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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inline _Res
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__invoke_impl(__invoke_memobj_ref, _MemFun&& __f, _Tp&& __t)
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noexcept(noexcept(__invfwd<_Tp>(__t).*__f))
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{ return __invfwd<_Tp>(__t).*__f; }
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template<typename _Res, typename _MemFun, typename _Tp, typename... _Args>
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inline _Res
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__invoke_impl(__invoke_memobj_deref, _MemFun&& __f, _Tp&& __t,
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_Args&&... __args)
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noexcept(noexcept((*std::forward<_Tp>(__t)).*__f))
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{ return (*std::forward<_Tp>(__t)).*__f; }
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/// Invoke a callable object.
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template<typename _Callable, typename... _Args>
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inline typename result_of<_Callable&&(_Args&&...)>::type
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__invoke(_Callable&& __fn, _Args&&... __args)
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{
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using __result_of = result_of<_Callable&&(_Args&&...)>;
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using __type = typename __result_of::type;
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using __tag = typename __result_of::__invoke_type;
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return std::__invoke_impl<__type>(__tag{}, std::forward<_Callable>(__fn),
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std::forward<_Args>(__args)...);
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}
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#if __cplusplus > 201402L
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# define __cpp_lib_invoke 201411
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/// Invoke a callable object.
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template<typename _Callable, typename... _Args>
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inline result_of_t<_Callable&&(_Args&&...)>
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invoke(_Callable&& __fn, _Args&&... __args)
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{
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return std::__invoke(std::forward<_Callable>(__fn),
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std::forward<_Args>(__args)...);
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}
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#endif
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/**
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* Knowing which of unary_function and binary_function _Tp derives
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* from, derives from the same and ensures that reference_wrapper
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* will have a weak result type. See cases below.
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*/
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template<bool _Unary, bool _Binary, typename _Tp>
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struct _Reference_wrapper_base_impl;
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// None of the nested argument types.
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template<typename _Tp>
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struct _Reference_wrapper_base_impl<false, false, _Tp>
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: _Weak_result_type<_Tp>
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{ };
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// Nested argument_type only.
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template<typename _Tp>
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struct _Reference_wrapper_base_impl<true, false, _Tp>
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: _Weak_result_type<_Tp>
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{
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typedef typename _Tp::argument_type argument_type;
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};
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// Nested first_argument_type and second_argument_type only.
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template<typename _Tp>
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struct _Reference_wrapper_base_impl<false, true, _Tp>
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: _Weak_result_type<_Tp>
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{
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typedef typename _Tp::first_argument_type first_argument_type;
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typedef typename _Tp::second_argument_type second_argument_type;
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};
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// All the nested argument types.
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template<typename _Tp>
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struct _Reference_wrapper_base_impl<true, true, _Tp>
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: _Weak_result_type<_Tp>
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{
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typedef typename _Tp::argument_type argument_type;
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typedef typename _Tp::first_argument_type first_argument_type;
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typedef typename _Tp::second_argument_type second_argument_type;
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};
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_GLIBCXX_HAS_NESTED_TYPE(argument_type)
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_GLIBCXX_HAS_NESTED_TYPE(first_argument_type)
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_GLIBCXX_HAS_NESTED_TYPE(second_argument_type)
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/**
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* Derives from unary_function or binary_function when it
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* can. Specializations handle all of the easy cases. The primary
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* template determines what to do with a class type, which may
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* derive from both unary_function and binary_function.
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*/
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template<typename _Tp>
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struct _Reference_wrapper_base
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: _Reference_wrapper_base_impl<
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__has_argument_type<_Tp>::value,
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__has_first_argument_type<_Tp>::value
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&& __has_second_argument_type<_Tp>::value,
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_Tp>
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{ };
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// - a function type (unary)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res(_T1)>
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: unary_function<_T1, _Res>
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{ };
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res(_T1) const>
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: unary_function<_T1, _Res>
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{ };
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res(_T1) volatile>
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: unary_function<_T1, _Res>
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{ };
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res(_T1) const volatile>
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: unary_function<_T1, _Res>
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{ };
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// - a function type (binary)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res(_T1, _T2)>
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: binary_function<_T1, _T2, _Res>
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{ };
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res(_T1, _T2) const>
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: binary_function<_T1, _T2, _Res>
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{ };
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>
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: binary_function<_T1, _T2, _Res>
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{ };
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>
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: binary_function<_T1, _T2, _Res>
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{ };
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// - a function pointer type (unary)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res(*)(_T1)>
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: unary_function<_T1, _Res>
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{ };
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// - a function pointer type (binary)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
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: binary_function<_T1, _T2, _Res>
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{ };
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// - a pointer to member function type (unary, no qualifiers)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res (_T1::*)()>
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: unary_function<_T1*, _Res>
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{ };
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// - a pointer to member function type (binary, no qualifiers)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
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: binary_function<_T1*, _T2, _Res>
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{ };
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// - a pointer to member function type (unary, const)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res (_T1::*)() const>
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: unary_function<const _T1*, _Res>
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{ };
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// - a pointer to member function type (binary, const)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
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: binary_function<const _T1*, _T2, _Res>
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{ };
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// - a pointer to member function type (unary, volatile)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
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: unary_function<volatile _T1*, _Res>
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{ };
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// - a pointer to member function type (binary, volatile)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
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: binary_function<volatile _T1*, _T2, _Res>
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{ };
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// - a pointer to member function type (unary, const volatile)
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template<typename _Res, typename _T1>
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struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
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: unary_function<const volatile _T1*, _Res>
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{ };
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// - a pointer to member function type (binary, const volatile)
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template<typename _Res, typename _T1, typename _T2>
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struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
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: binary_function<const volatile _T1*, _T2, _Res>
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{ };
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/**
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* @brief Primary class template for reference_wrapper.
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* @ingroup functors
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* @{
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*/
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template<typename _Tp>
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class reference_wrapper
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: public _Reference_wrapper_base<typename remove_cv<_Tp>::type>
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{
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_Tp* _M_data;
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public:
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typedef _Tp type;
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reference_wrapper(_Tp& __indata) noexcept
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: _M_data(std::__addressof(__indata))
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{ }
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reference_wrapper(_Tp&&) = delete;
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reference_wrapper(const reference_wrapper&) = default;
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reference_wrapper&
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operator=(const reference_wrapper&) = default;
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operator _Tp&() const noexcept
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{ return this->get(); }
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_Tp&
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get() const noexcept
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{ return *_M_data; }
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template<typename... _Args>
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typename result_of<_Tp&(_Args&&...)>::type
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operator()(_Args&&... __args) const
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{
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return std::__invoke(get(), std::forward<_Args>(__args)...);
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}
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};
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/// Denotes a reference should be taken to a variable.
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template<typename _Tp>
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inline reference_wrapper<_Tp>
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ref(_Tp& __t) noexcept
|
|
{ return reference_wrapper<_Tp>(__t); }
|
|
|
|
/// Denotes a const reference should be taken to a variable.
|
|
template<typename _Tp>
|
|
inline reference_wrapper<const _Tp>
|
|
cref(const _Tp& __t) noexcept
|
|
{ return reference_wrapper<const _Tp>(__t); }
|
|
|
|
template<typename _Tp>
|
|
void ref(const _Tp&&) = delete;
|
|
|
|
template<typename _Tp>
|
|
void cref(const _Tp&&) = delete;
|
|
|
|
/// Partial specialization.
|
|
template<typename _Tp>
|
|
inline reference_wrapper<_Tp>
|
|
ref(reference_wrapper<_Tp> __t) noexcept
|
|
{ return ref(__t.get()); }
|
|
|
|
/// Partial specialization.
|
|
template<typename _Tp>
|
|
inline reference_wrapper<const _Tp>
|
|
cref(reference_wrapper<_Tp> __t) noexcept
|
|
{ return cref(__t.get()); }
|
|
|
|
// @} group functors
|
|
|
|
template<typename... _Types>
|
|
struct _Pack : integral_constant<size_t, sizeof...(_Types)>
|
|
{ };
|
|
|
|
template<typename _From, typename _To, bool = _From::value == _To::value>
|
|
struct _AllConvertible : false_type
|
|
{ };
|
|
|
|
template<typename... _From, typename... _To>
|
|
struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true>
|
|
: __and_<is_convertible<_From, _To>...>
|
|
{ };
|
|
|
|
template<typename _Tp1, typename _Tp2>
|
|
using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type,
|
|
typename std::decay<_Tp2>::type>>;
|
|
|
|
/**
|
|
* Derives from @c unary_function or @c binary_function, or perhaps
|
|
* nothing, depending on the number of arguments provided. The
|
|
* primary template is the basis case, which derives nothing.
|
|
*/
|
|
template<typename _Res, typename... _ArgTypes>
|
|
struct _Maybe_unary_or_binary_function { };
|
|
|
|
/// Derives from @c unary_function, as appropriate.
|
|
template<typename _Res, typename _T1>
|
|
struct _Maybe_unary_or_binary_function<_Res, _T1>
|
|
: std::unary_function<_T1, _Res> { };
|
|
|
|
/// Derives from @c binary_function, as appropriate.
|
|
template<typename _Res, typename _T1, typename _T2>
|
|
struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
|
|
: std::binary_function<_T1, _T2, _Res> { };
|
|
|
|
template<typename _Signature>
|
|
struct _Mem_fn_traits;
|
|
|
|
template<typename _Res, typename _Class, typename... _ArgTypes>
|
|
struct _Mem_fn_traits_base
|
|
{
|
|
using __result_type = _Res;
|
|
using __maybe_type
|
|
= _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>;
|
|
using __arity = integral_constant<size_t, sizeof...(_ArgTypes)>;
|
|
};
|
|
|
|
#define _GLIBCXX_MEM_FN_TRAITS2(_CV, _REF, _LVAL, _RVAL) \
|
|
template<typename _Res, typename _Class, typename... _ArgTypes> \
|
|
struct _Mem_fn_traits<_Res (_Class::*)(_ArgTypes...) _CV _REF> \
|
|
: _Mem_fn_traits_base<_Res, _CV _Class, _ArgTypes...> \
|
|
{ \
|
|
using __vararg = false_type; \
|
|
}; \
|
|
template<typename _Res, typename _Class, typename... _ArgTypes> \
|
|
struct _Mem_fn_traits<_Res (_Class::*)(_ArgTypes... ...) _CV _REF> \
|
|
: _Mem_fn_traits_base<_Res, _CV _Class, _ArgTypes...> \
|
|
{ \
|
|
using __vararg = true_type; \
|
|
};
|
|
|
|
#define _GLIBCXX_MEM_FN_TRAITS(_REF, _LVAL, _RVAL) \
|
|
_GLIBCXX_MEM_FN_TRAITS2( , _REF, _LVAL, _RVAL) \
|
|
_GLIBCXX_MEM_FN_TRAITS2(const , _REF, _LVAL, _RVAL) \
|
|
_GLIBCXX_MEM_FN_TRAITS2(volatile , _REF, _LVAL, _RVAL) \
|
|
_GLIBCXX_MEM_FN_TRAITS2(const volatile, _REF, _LVAL, _RVAL)
|
|
|
|
_GLIBCXX_MEM_FN_TRAITS( , true_type, true_type)
|
|
_GLIBCXX_MEM_FN_TRAITS(&, true_type, false_type)
|
|
_GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
|
|
|
|
#undef _GLIBCXX_MEM_FN_TRAITS
|
|
#undef _GLIBCXX_MEM_FN_TRAITS2
|
|
|
|
template<typename _MemFunPtr,
|
|
bool __is_mem_fn = is_member_function_pointer<_MemFunPtr>::value>
|
|
class _Mem_fn_base
|
|
: public _Mem_fn_traits<_MemFunPtr>::__maybe_type
|
|
{
|
|
using _Traits = _Mem_fn_traits<_MemFunPtr>;
|
|
|
|
using _Arity = typename _Traits::__arity;
|
|
using _Varargs = typename _Traits::__vararg;
|
|
|
|
template<typename _Func, typename... _BoundArgs>
|
|
friend struct _Bind_check_arity;
|
|
|
|
_MemFunPtr _M_pmf;
|
|
|
|
public:
|
|
|
|
using result_type = typename _Traits::__result_type;
|
|
|
|
explicit constexpr
|
|
_Mem_fn_base(_MemFunPtr __pmf) noexcept : _M_pmf(__pmf) { }
|
|
|
|
template<typename... _Args>
|
|
auto
|
|
operator()(_Args&&... __args) const
|
|
noexcept(noexcept(
|
|
std::__invoke(_M_pmf, std::forward<_Args>(__args)...)))
|
|
-> decltype(std::__invoke(_M_pmf, std::forward<_Args>(__args)...))
|
|
{ return std::__invoke(_M_pmf, std::forward<_Args>(__args)...); }
|
|
};
|
|
|
|
// Partial specialization for member object pointers.
|
|
template<typename _MemObjPtr>
|
|
class _Mem_fn_base<_MemObjPtr, false>
|
|
{
|
|
using _Arity = integral_constant<size_t, 0>;
|
|
using _Varargs = false_type;
|
|
|
|
template<typename _Func, typename... _BoundArgs>
|
|
friend struct _Bind_check_arity;
|
|
|
|
_MemObjPtr _M_pm;
|
|
|
|
public:
|
|
explicit constexpr
|
|
_Mem_fn_base(_MemObjPtr __pm) noexcept : _M_pm(__pm) { }
|
|
|
|
template<typename _Tp>
|
|
auto
|
|
operator()(_Tp&& __obj) const
|
|
noexcept(noexcept(std::__invoke(_M_pm, std::forward<_Tp>(__obj))))
|
|
-> decltype(std::__invoke(_M_pm, std::forward<_Tp>(__obj)))
|
|
{ return std::__invoke(_M_pm, std::forward<_Tp>(__obj)); }
|
|
};
|
|
|
|
template<typename _Res, typename _Class>
|
|
struct _Mem_fn<_Res _Class::*>
|
|
: _Mem_fn_base<_Res _Class::*>
|
|
{
|
|
using _Mem_fn_base<_Res _Class::*>::_Mem_fn_base;
|
|
};
|
|
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// 2048. Unnecessary mem_fn overloads
|
|
/**
|
|
* @brief Returns a function object that forwards to the member
|
|
* pointer @a pm.
|
|
* @ingroup functors
|
|
*/
|
|
template<typename _Tp, typename _Class>
|
|
inline _Mem_fn<_Tp _Class::*>
|
|
mem_fn(_Tp _Class::* __pm) noexcept
|
|
{
|
|
return _Mem_fn<_Tp _Class::*>(__pm);
|
|
}
|
|
|
|
/**
|
|
* @brief Determines if the given type _Tp is a function object that
|
|
* should be treated as a subexpression when evaluating calls to
|
|
* function objects returned by bind().
|
|
*
|
|
* C++11 [func.bind.isbind].
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Tp>
|
|
struct is_bind_expression
|
|
: public false_type { };
|
|
|
|
/**
|
|
* @brief Determines if the given type _Tp is a placeholder in a
|
|
* bind() expression and, if so, which placeholder it is.
|
|
*
|
|
* C++11 [func.bind.isplace].
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Tp>
|
|
struct is_placeholder
|
|
: public integral_constant<int, 0>
|
|
{ };
|
|
|
|
/** @brief The type of placeholder objects defined by libstdc++.
|
|
* @ingroup binders
|
|
*/
|
|
template<int _Num> struct _Placeholder { };
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
|
|
/** @namespace std::placeholders
|
|
* @brief ISO C++11 entities sub-namespace for functional.
|
|
* @ingroup binders
|
|
*/
|
|
namespace placeholders
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
/* Define a large number of placeholders. There is no way to
|
|
* simplify this with variadic templates, because we're introducing
|
|
* unique names for each.
|
|
*/
|
|
extern const _Placeholder<1> _1;
|
|
extern const _Placeholder<2> _2;
|
|
extern const _Placeholder<3> _3;
|
|
extern const _Placeholder<4> _4;
|
|
extern const _Placeholder<5> _5;
|
|
extern const _Placeholder<6> _6;
|
|
extern const _Placeholder<7> _7;
|
|
extern const _Placeholder<8> _8;
|
|
extern const _Placeholder<9> _9;
|
|
extern const _Placeholder<10> _10;
|
|
extern const _Placeholder<11> _11;
|
|
extern const _Placeholder<12> _12;
|
|
extern const _Placeholder<13> _13;
|
|
extern const _Placeholder<14> _14;
|
|
extern const _Placeholder<15> _15;
|
|
extern const _Placeholder<16> _16;
|
|
extern const _Placeholder<17> _17;
|
|
extern const _Placeholder<18> _18;
|
|
extern const _Placeholder<19> _19;
|
|
extern const _Placeholder<20> _20;
|
|
extern const _Placeholder<21> _21;
|
|
extern const _Placeholder<22> _22;
|
|
extern const _Placeholder<23> _23;
|
|
extern const _Placeholder<24> _24;
|
|
extern const _Placeholder<25> _25;
|
|
extern const _Placeholder<26> _26;
|
|
extern const _Placeholder<27> _27;
|
|
extern const _Placeholder<28> _28;
|
|
extern const _Placeholder<29> _29;
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
}
|
|
|
|
_GLIBCXX_BEGIN_NAMESPACE_VERSION
|
|
|
|
/**
|
|
* Partial specialization of is_placeholder that provides the placeholder
|
|
* number for the placeholder objects defined by libstdc++.
|
|
* @ingroup binders
|
|
*/
|
|
template<int _Num>
|
|
struct is_placeholder<_Placeholder<_Num> >
|
|
: public integral_constant<int, _Num>
|
|
{ };
|
|
|
|
template<int _Num>
|
|
struct is_placeholder<const _Placeholder<_Num> >
|
|
: public integral_constant<int, _Num>
|
|
{ };
|
|
|
|
|
|
// Like tuple_element_t but SFINAE-friendly.
|
|
template<std::size_t __i, typename _Tuple>
|
|
using _Safe_tuple_element_t
|
|
= typename enable_if<(__i < tuple_size<_Tuple>::value),
|
|
tuple_element<__i, _Tuple>>::type::type;
|
|
|
|
/**
|
|
* Maps an argument to bind() into an actual argument to the bound
|
|
* function object [func.bind.bind]/10. Only the first parameter should
|
|
* be specified: the rest are used to determine among the various
|
|
* implementations. Note that, although this class is a function
|
|
* object, it isn't entirely normal because it takes only two
|
|
* parameters regardless of the number of parameters passed to the
|
|
* bind expression. The first parameter is the bound argument and
|
|
* the second parameter is a tuple containing references to the
|
|
* rest of the arguments.
|
|
*/
|
|
template<typename _Arg,
|
|
bool _IsBindExp = is_bind_expression<_Arg>::value,
|
|
bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>
|
|
class _Mu;
|
|
|
|
/**
|
|
* If the argument is reference_wrapper<_Tp>, returns the
|
|
* underlying reference.
|
|
* C++11 [func.bind.bind] p10 bullet 1.
|
|
*/
|
|
template<typename _Tp>
|
|
class _Mu<reference_wrapper<_Tp>, false, false>
|
|
{
|
|
public:
|
|
/* Note: This won't actually work for const volatile
|
|
* reference_wrappers, because reference_wrapper::get() is const
|
|
* but not volatile-qualified. This might be a defect in the TR.
|
|
*/
|
|
template<typename _CVRef, typename _Tuple>
|
|
_Tp&
|
|
operator()(_CVRef& __arg, _Tuple&) const volatile
|
|
{ return __arg.get(); }
|
|
};
|
|
|
|
/**
|
|
* If the argument is a bind expression, we invoke the underlying
|
|
* function object with the same cv-qualifiers as we are given and
|
|
* pass along all of our arguments (unwrapped).
|
|
* C++11 [func.bind.bind] p10 bullet 2.
|
|
*/
|
|
template<typename _Arg>
|
|
class _Mu<_Arg, true, false>
|
|
{
|
|
public:
|
|
template<typename _CVArg, typename... _Args>
|
|
auto
|
|
operator()(_CVArg& __arg,
|
|
tuple<_Args...>& __tuple) const volatile
|
|
-> decltype(__arg(declval<_Args>()...))
|
|
{
|
|
// Construct an index tuple and forward to __call
|
|
typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
|
|
_Indexes;
|
|
return this->__call(__arg, __tuple, _Indexes());
|
|
}
|
|
|
|
private:
|
|
// Invokes the underlying function object __arg by unpacking all
|
|
// of the arguments in the tuple.
|
|
template<typename _CVArg, typename... _Args, std::size_t... _Indexes>
|
|
auto
|
|
__call(_CVArg& __arg, tuple<_Args...>& __tuple,
|
|
const _Index_tuple<_Indexes...>&) const volatile
|
|
-> decltype(__arg(declval<_Args>()...))
|
|
{
|
|
return __arg(std::forward<_Args>(std::get<_Indexes>(__tuple))...);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* If the argument is a placeholder for the Nth argument, returns
|
|
* a reference to the Nth argument to the bind function object.
|
|
* C++11 [func.bind.bind] p10 bullet 3.
|
|
*/
|
|
template<typename _Arg>
|
|
class _Mu<_Arg, false, true>
|
|
{
|
|
public:
|
|
template<typename _Tuple>
|
|
_Safe_tuple_element_t<(is_placeholder<_Arg>::value - 1), _Tuple>&&
|
|
operator()(const volatile _Arg&, _Tuple& __tuple) const volatile
|
|
{
|
|
using __type
|
|
= __tuple_element_t<(is_placeholder<_Arg>::value - 1), _Tuple>;
|
|
return std::forward<__type>(
|
|
::std::get<(is_placeholder<_Arg>::value - 1)>(__tuple));
|
|
}
|
|
};
|
|
|
|
/**
|
|
* If the argument is just a value, returns a reference to that
|
|
* value. The cv-qualifiers on the reference are determined by the caller.
|
|
* C++11 [func.bind.bind] p10 bullet 4.
|
|
*/
|
|
template<typename _Arg>
|
|
class _Mu<_Arg, false, false>
|
|
{
|
|
public:
|
|
template<typename _CVArg, typename _Tuple>
|
|
_CVArg&&
|
|
operator()(_CVArg&& __arg, _Tuple&) const volatile
|
|
{ return std::forward<_CVArg>(__arg); }
|
|
};
|
|
|
|
/**
|
|
* Maps member pointers into instances of _Mem_fn but leaves all
|
|
* other function objects untouched. Used by std::bind(). The
|
|
* primary template handles the non-member-pointer case.
|
|
*/
|
|
template<typename _Tp>
|
|
struct _Maybe_wrap_member_pointer
|
|
{
|
|
typedef _Tp type;
|
|
|
|
static constexpr const _Tp&
|
|
__do_wrap(const _Tp& __x)
|
|
{ return __x; }
|
|
|
|
static constexpr _Tp&&
|
|
__do_wrap(_Tp&& __x)
|
|
{ return static_cast<_Tp&&>(__x); }
|
|
};
|
|
|
|
/**
|
|
* Maps member pointers into instances of _Mem_fn but leaves all
|
|
* other function objects untouched. Used by std::bind(). This
|
|
* partial specialization handles the member pointer case.
|
|
*/
|
|
template<typename _Tp, typename _Class>
|
|
struct _Maybe_wrap_member_pointer<_Tp _Class::*>
|
|
{
|
|
typedef _Mem_fn<_Tp _Class::*> type;
|
|
|
|
static constexpr type
|
|
__do_wrap(_Tp _Class::* __pm)
|
|
{ return type(__pm); }
|
|
};
|
|
|
|
// Specialization needed to prevent "forming reference to void" errors when
|
|
// bind<void>() is called, because argument deduction instantiates
|
|
// _Maybe_wrap_member_pointer<void> outside the immediate context where
|
|
// SFINAE applies.
|
|
template<>
|
|
struct _Maybe_wrap_member_pointer<void>
|
|
{
|
|
typedef void type;
|
|
};
|
|
|
|
// std::get<I> for volatile-qualified tuples
|
|
template<std::size_t _Ind, typename... _Tp>
|
|
inline auto
|
|
__volget(volatile tuple<_Tp...>& __tuple)
|
|
-> __tuple_element_t<_Ind, tuple<_Tp...>> volatile&
|
|
{ return std::get<_Ind>(const_cast<tuple<_Tp...>&>(__tuple)); }
|
|
|
|
// std::get<I> for const-volatile-qualified tuples
|
|
template<std::size_t _Ind, typename... _Tp>
|
|
inline auto
|
|
__volget(const volatile tuple<_Tp...>& __tuple)
|
|
-> __tuple_element_t<_Ind, tuple<_Tp...>> const volatile&
|
|
{ return std::get<_Ind>(const_cast<const tuple<_Tp...>&>(__tuple)); }
|
|
|
|
/// Type of the function object returned from bind().
|
|
template<typename _Signature>
|
|
struct _Bind;
|
|
|
|
template<typename _Functor, typename... _Bound_args>
|
|
class _Bind<_Functor(_Bound_args...)>
|
|
: public _Weak_result_type<_Functor>
|
|
{
|
|
typedef _Bind __self_type;
|
|
typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
|
|
_Bound_indexes;
|
|
|
|
_Functor _M_f;
|
|
tuple<_Bound_args...> _M_bound_args;
|
|
|
|
// Call unqualified
|
|
template<typename _Result, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const
|
|
template<typename _Result, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as volatile
|
|
template<typename _Result, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call_v(tuple<_Args...>&& __args,
|
|
_Index_tuple<_Indexes...>) volatile
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const volatile
|
|
template<typename _Result, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call_c_v(tuple<_Args...>&& __args,
|
|
_Index_tuple<_Indexes...>) const volatile
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
public:
|
|
template<typename... _Args>
|
|
explicit _Bind(const _Functor& __f, _Args&&... __args)
|
|
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
|
|
{ }
|
|
|
|
template<typename... _Args>
|
|
explicit _Bind(_Functor&& __f, _Args&&... __args)
|
|
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
|
|
{ }
|
|
|
|
_Bind(const _Bind&) = default;
|
|
|
|
_Bind(_Bind&& __b)
|
|
: _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
|
|
{ }
|
|
|
|
// Call unqualified
|
|
template<typename... _Args, typename _Result
|
|
= decltype( std::declval<_Functor&>()(
|
|
_Mu<_Bound_args>()( std::declval<_Bound_args&>(),
|
|
std::declval<tuple<_Args...>&>() )... ) )>
|
|
_Result
|
|
operator()(_Args&&... __args)
|
|
{
|
|
return this->__call<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as const
|
|
template<typename... _Args, typename _Result
|
|
= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
|
|
typename add_const<_Functor>::type&>::type>()(
|
|
_Mu<_Bound_args>()( std::declval<const _Bound_args&>(),
|
|
std::declval<tuple<_Args...>&>() )... ) )>
|
|
_Result
|
|
operator()(_Args&&... __args) const
|
|
{
|
|
return this->__call_c<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as volatile
|
|
template<typename... _Args, typename _Result
|
|
= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
|
|
typename add_volatile<_Functor>::type&>::type>()(
|
|
_Mu<_Bound_args>()( std::declval<volatile _Bound_args&>(),
|
|
std::declval<tuple<_Args...>&>() )... ) )>
|
|
_Result
|
|
operator()(_Args&&... __args) volatile
|
|
{
|
|
return this->__call_v<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as const volatile
|
|
template<typename... _Args, typename _Result
|
|
= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),
|
|
typename add_cv<_Functor>::type&>::type>()(
|
|
_Mu<_Bound_args>()( std::declval<const volatile _Bound_args&>(),
|
|
std::declval<tuple<_Args...>&>() )... ) )>
|
|
_Result
|
|
operator()(_Args&&... __args) const volatile
|
|
{
|
|
return this->__call_c_v<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
};
|
|
|
|
/// Type of the function object returned from bind<R>().
|
|
template<typename _Result, typename _Signature>
|
|
struct _Bind_result;
|
|
|
|
template<typename _Result, typename _Functor, typename... _Bound_args>
|
|
class _Bind_result<_Result, _Functor(_Bound_args...)>
|
|
{
|
|
typedef _Bind_result __self_type;
|
|
typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type
|
|
_Bound_indexes;
|
|
|
|
_Functor _M_f;
|
|
tuple<_Bound_args...> _M_bound_args;
|
|
|
|
// sfinae types
|
|
template<typename _Res>
|
|
struct __enable_if_void : enable_if<is_void<_Res>::value, int> { };
|
|
template<typename _Res>
|
|
struct __disable_if_void : enable_if<!is_void<_Res>::value, int> { };
|
|
|
|
// Call unqualified
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __disable_if_void<_Res>::type = 0)
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call unqualified, return void
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
void
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __enable_if_void<_Res>::type = 0)
|
|
{
|
|
_M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __disable_if_void<_Res>::type = 0) const
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const, return void
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
void
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __enable_if_void<_Res>::type = 0) const
|
|
{
|
|
_M_f(_Mu<_Bound_args>()
|
|
(std::get<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as volatile
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __disable_if_void<_Res>::type = 0) volatile
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as volatile, return void
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
void
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __enable_if_void<_Res>::type = 0) volatile
|
|
{
|
|
_M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const volatile
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
_Result
|
|
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
|
|
typename __disable_if_void<_Res>::type = 0) const volatile
|
|
{
|
|
return _M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
// Call as const volatile, return void
|
|
template<typename _Res, typename... _Args, std::size_t... _Indexes>
|
|
void
|
|
__call(tuple<_Args...>&& __args,
|
|
_Index_tuple<_Indexes...>,
|
|
typename __enable_if_void<_Res>::type = 0) const volatile
|
|
{
|
|
_M_f(_Mu<_Bound_args>()
|
|
(__volget<_Indexes>(_M_bound_args), __args)...);
|
|
}
|
|
|
|
public:
|
|
typedef _Result result_type;
|
|
|
|
template<typename... _Args>
|
|
explicit _Bind_result(const _Functor& __f, _Args&&... __args)
|
|
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
|
|
{ }
|
|
|
|
template<typename... _Args>
|
|
explicit _Bind_result(_Functor&& __f, _Args&&... __args)
|
|
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
|
|
{ }
|
|
|
|
_Bind_result(const _Bind_result&) = default;
|
|
|
|
_Bind_result(_Bind_result&& __b)
|
|
: _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
|
|
{ }
|
|
|
|
// Call unqualified
|
|
template<typename... _Args>
|
|
result_type
|
|
operator()(_Args&&... __args)
|
|
{
|
|
return this->__call<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as const
|
|
template<typename... _Args>
|
|
result_type
|
|
operator()(_Args&&... __args) const
|
|
{
|
|
return this->__call<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as volatile
|
|
template<typename... _Args>
|
|
result_type
|
|
operator()(_Args&&... __args) volatile
|
|
{
|
|
return this->__call<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
|
|
// Call as const volatile
|
|
template<typename... _Args>
|
|
result_type
|
|
operator()(_Args&&... __args) const volatile
|
|
{
|
|
return this->__call<_Result>(
|
|
std::forward_as_tuple(std::forward<_Args>(__args)...),
|
|
_Bound_indexes());
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief Class template _Bind is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Signature>
|
|
struct is_bind_expression<_Bind<_Signature> >
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Signature>
|
|
struct is_bind_expression<const _Bind<_Signature> >
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Signature>
|
|
struct is_bind_expression<volatile _Bind<_Signature> >
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Signature>
|
|
struct is_bind_expression<const volatile _Bind<_Signature>>
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind_result is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Result, typename _Signature>
|
|
struct is_bind_expression<_Bind_result<_Result, _Signature>>
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind_result is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Result, typename _Signature>
|
|
struct is_bind_expression<const _Bind_result<_Result, _Signature>>
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind_result is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Result, typename _Signature>
|
|
struct is_bind_expression<volatile _Bind_result<_Result, _Signature>>
|
|
: public true_type { };
|
|
|
|
/**
|
|
* @brief Class template _Bind_result is always a bind expression.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Result, typename _Signature>
|
|
struct is_bind_expression<const volatile _Bind_result<_Result, _Signature>>
|
|
: public true_type { };
|
|
|
|
template<typename _Func, typename... _BoundArgs>
|
|
struct _Bind_check_arity { };
|
|
|
|
template<typename _Ret, typename... _Args, typename... _BoundArgs>
|
|
struct _Bind_check_arity<_Ret (*)(_Args...), _BoundArgs...>
|
|
{
|
|
static_assert(sizeof...(_BoundArgs) == sizeof...(_Args),
|
|
"Wrong number of arguments for function");
|
|
};
|
|
|
|
template<typename _Ret, typename... _Args, typename... _BoundArgs>
|
|
struct _Bind_check_arity<_Ret (*)(_Args......), _BoundArgs...>
|
|
{
|
|
static_assert(sizeof...(_BoundArgs) >= sizeof...(_Args),
|
|
"Wrong number of arguments for function");
|
|
};
|
|
|
|
template<typename _Tp, typename _Class, typename... _BoundArgs>
|
|
struct _Bind_check_arity<_Tp _Class::*, _BoundArgs...>
|
|
{
|
|
using _Arity = typename _Mem_fn<_Tp _Class::*>::_Arity;
|
|
using _Varargs = typename _Mem_fn<_Tp _Class::*>::_Varargs;
|
|
static_assert(_Varargs::value
|
|
? sizeof...(_BoundArgs) >= _Arity::value + 1
|
|
: sizeof...(_BoundArgs) == _Arity::value + 1,
|
|
"Wrong number of arguments for pointer-to-member");
|
|
};
|
|
|
|
// Trait type used to remove std::bind() from overload set via SFINAE
|
|
// when first argument has integer type, so that std::bind() will
|
|
// not be a better match than ::bind() from the BSD Sockets API.
|
|
template<typename _Tp, typename _Tp2 = typename decay<_Tp>::type>
|
|
using __is_socketlike = __or_<is_integral<_Tp2>, is_enum<_Tp2>>;
|
|
|
|
template<bool _SocketLike, typename _Func, typename... _BoundArgs>
|
|
struct _Bind_helper
|
|
: _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...>
|
|
{
|
|
typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>
|
|
__maybe_type;
|
|
typedef typename __maybe_type::type __func_type;
|
|
typedef _Bind<__func_type(typename decay<_BoundArgs>::type...)> type;
|
|
};
|
|
|
|
// Partial specialization for is_socketlike == true, does not define
|
|
// nested type so std::bind() will not participate in overload resolution
|
|
// when the first argument might be a socket file descriptor.
|
|
template<typename _Func, typename... _BoundArgs>
|
|
struct _Bind_helper<true, _Func, _BoundArgs...>
|
|
{ };
|
|
|
|
/**
|
|
* @brief Function template for std::bind.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Func, typename... _BoundArgs>
|
|
inline typename
|
|
_Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::type
|
|
bind(_Func&& __f, _BoundArgs&&... __args)
|
|
{
|
|
typedef _Bind_helper<false, _Func, _BoundArgs...> __helper_type;
|
|
typedef typename __helper_type::__maybe_type __maybe_type;
|
|
typedef typename __helper_type::type __result_type;
|
|
return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)),
|
|
std::forward<_BoundArgs>(__args)...);
|
|
}
|
|
|
|
template<typename _Result, typename _Func, typename... _BoundArgs>
|
|
struct _Bindres_helper
|
|
: _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...>
|
|
{
|
|
typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>
|
|
__maybe_type;
|
|
typedef typename __maybe_type::type __functor_type;
|
|
typedef _Bind_result<_Result,
|
|
__functor_type(typename decay<_BoundArgs>::type...)>
|
|
type;
|
|
};
|
|
|
|
/**
|
|
* @brief Function template for std::bind<R>.
|
|
* @ingroup binders
|
|
*/
|
|
template<typename _Result, typename _Func, typename... _BoundArgs>
|
|
inline
|
|
typename _Bindres_helper<_Result, _Func, _BoundArgs...>::type
|
|
bind(_Func&& __f, _BoundArgs&&... __args)
|
|
{
|
|
typedef _Bindres_helper<_Result, _Func, _BoundArgs...> __helper_type;
|
|
typedef typename __helper_type::__maybe_type __maybe_type;
|
|
typedef typename __helper_type::type __result_type;
|
|
return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)),
|
|
std::forward<_BoundArgs>(__args)...);
|
|
}
|
|
|
|
template<typename _Signature>
|
|
struct _Bind_simple;
|
|
|
|
template<typename _Callable, typename... _Args>
|
|
struct _Bind_simple<_Callable(_Args...)>
|
|
{
|
|
typedef typename result_of<_Callable(_Args...)>::type result_type;
|
|
|
|
template<typename _Tp, typename... _Up>
|
|
explicit
|
|
_Bind_simple(_Tp&& __f, _Up&&... __args)
|
|
: _M_bound(std::forward<_Tp>(__f), std::forward<_Up>(__args)...)
|
|
{ }
|
|
|
|
_Bind_simple(const _Bind_simple&) = default;
|
|
_Bind_simple(_Bind_simple&&) = default;
|
|
|
|
result_type
|
|
operator()()
|
|
{
|
|
typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indices;
|
|
return _M_invoke(_Indices());
|
|
}
|
|
|
|
private:
|
|
template<std::size_t... _Indices>
|
|
typename result_of<_Callable(_Args...)>::type
|
|
_M_invoke(_Index_tuple<_Indices...>)
|
|
{
|
|
// std::bind always forwards bound arguments as lvalues,
|
|
// but this type can call functions which only accept rvalues.
|
|
return std::forward<_Callable>(std::get<0>(_M_bound))(
|
|
std::forward<_Args>(std::get<_Indices+1>(_M_bound))...);
|
|
}
|
|
|
|
std::tuple<_Callable, _Args...> _M_bound;
|
|
};
|
|
|
|
template<typename _Func, typename... _BoundArgs>
|
|
struct _Bind_simple_helper
|
|
: _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...>
|
|
{
|
|
typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>
|
|
__maybe_type;
|
|
typedef typename __maybe_type::type __func_type;
|
|
typedef _Bind_simple<__func_type(typename decay<_BoundArgs>::type...)>
|
|
__type;
|
|
};
|
|
|
|
// Simplified version of std::bind for internal use, without support for
|
|
// unbound arguments, placeholders or nested bind expressions.
|
|
template<typename _Callable, typename... _Args>
|
|
typename _Bind_simple_helper<_Callable, _Args...>::__type
|
|
__bind_simple(_Callable&& __callable, _Args&&... __args)
|
|
{
|
|
typedef _Bind_simple_helper<_Callable, _Args...> __helper_type;
|
|
typedef typename __helper_type::__maybe_type __maybe_type;
|
|
typedef typename __helper_type::__type __result_type;
|
|
return __result_type(
|
|
__maybe_type::__do_wrap( std::forward<_Callable>(__callable)),
|
|
std::forward<_Args>(__args)...);
|
|
}
|
|
|
|
/**
|
|
* @brief Exception class thrown when class template function's
|
|
* operator() is called with an empty target.
|
|
* @ingroup exceptions
|
|
*/
|
|
class bad_function_call : public std::exception
|
|
{
|
|
public:
|
|
virtual ~bad_function_call() noexcept;
|
|
|
|
const char* what() const noexcept;
|
|
};
|
|
|
|
/**
|
|
* Trait identifying "location-invariant" types, meaning that the
|
|
* address of the object (or any of its members) will not escape.
|
|
* Trivially copyable types are location-invariant and users can
|
|
* specialize this trait for other types.
|
|
*/
|
|
template<typename _Tp>
|
|
struct __is_location_invariant
|
|
: is_trivially_copyable<_Tp>::type
|
|
{ };
|
|
|
|
class _Undefined_class;
|
|
|
|
union _Nocopy_types
|
|
{
|
|
void* _M_object;
|
|
const void* _M_const_object;
|
|
void (*_M_function_pointer)();
|
|
void (_Undefined_class::*_M_member_pointer)();
|
|
};
|
|
|
|
union _Any_data
|
|
{
|
|
void* _M_access() { return &_M_pod_data[0]; }
|
|
const void* _M_access() const { return &_M_pod_data[0]; }
|
|
|
|
template<typename _Tp>
|
|
_Tp&
|
|
_M_access()
|
|
{ return *static_cast<_Tp*>(_M_access()); }
|
|
|
|
template<typename _Tp>
|
|
const _Tp&
|
|
_M_access() const
|
|
{ return *static_cast<const _Tp*>(_M_access()); }
|
|
|
|
_Nocopy_types _M_unused;
|
|
char _M_pod_data[sizeof(_Nocopy_types)];
|
|
};
|
|
|
|
enum _Manager_operation
|
|
{
|
|
__get_type_info,
|
|
__get_functor_ptr,
|
|
__clone_functor,
|
|
__destroy_functor
|
|
};
|
|
|
|
// Simple type wrapper that helps avoid annoying const problems
|
|
// when casting between void pointers and pointers-to-pointers.
|
|
template<typename _Tp>
|
|
struct _Simple_type_wrapper
|
|
{
|
|
_Simple_type_wrapper(_Tp __value) : __value(__value) { }
|
|
|
|
_Tp __value;
|
|
};
|
|
|
|
template<typename _Tp>
|
|
struct __is_location_invariant<_Simple_type_wrapper<_Tp> >
|
|
: __is_location_invariant<_Tp>
|
|
{ };
|
|
|
|
// Converts a reference to a function object into a callable
|
|
// function object.
|
|
template<typename _Functor>
|
|
inline _Functor&
|
|
__callable_functor(_Functor& __f)
|
|
{ return __f; }
|
|
|
|
template<typename _Member, typename _Class>
|
|
inline _Mem_fn<_Member _Class::*>
|
|
__callable_functor(_Member _Class::* &__p)
|
|
{ return std::mem_fn(__p); }
|
|
|
|
template<typename _Member, typename _Class>
|
|
inline _Mem_fn<_Member _Class::*>
|
|
__callable_functor(_Member _Class::* const &__p)
|
|
{ return std::mem_fn(__p); }
|
|
|
|
template<typename _Member, typename _Class>
|
|
inline _Mem_fn<_Member _Class::*>
|
|
__callable_functor(_Member _Class::* volatile &__p)
|
|
{ return std::mem_fn(__p); }
|
|
|
|
template<typename _Member, typename _Class>
|
|
inline _Mem_fn<_Member _Class::*>
|
|
__callable_functor(_Member _Class::* const volatile &__p)
|
|
{ return std::mem_fn(__p); }
|
|
|
|
template<typename _Signature>
|
|
class function;
|
|
|
|
/// Base class of all polymorphic function object wrappers.
|
|
class _Function_base
|
|
{
|
|
public:
|
|
static const std::size_t _M_max_size = sizeof(_Nocopy_types);
|
|
static const std::size_t _M_max_align = __alignof__(_Nocopy_types);
|
|
|
|
template<typename _Functor>
|
|
class _Base_manager
|
|
{
|
|
protected:
|
|
static const bool __stored_locally =
|
|
(__is_location_invariant<_Functor>::value
|
|
&& sizeof(_Functor) <= _M_max_size
|
|
&& __alignof__(_Functor) <= _M_max_align
|
|
&& (_M_max_align % __alignof__(_Functor) == 0));
|
|
|
|
typedef integral_constant<bool, __stored_locally> _Local_storage;
|
|
|
|
// Retrieve a pointer to the function object
|
|
static _Functor*
|
|
_M_get_pointer(const _Any_data& __source)
|
|
{
|
|
const _Functor* __ptr =
|
|
__stored_locally? std::__addressof(__source._M_access<_Functor>())
|
|
/* have stored a pointer */ : __source._M_access<_Functor*>();
|
|
return const_cast<_Functor*>(__ptr);
|
|
}
|
|
|
|
// Clone a location-invariant function object that fits within
|
|
// an _Any_data structure.
|
|
static void
|
|
_M_clone(_Any_data& __dest, const _Any_data& __source, true_type)
|
|
{
|
|
new (__dest._M_access()) _Functor(__source._M_access<_Functor>());
|
|
}
|
|
|
|
// Clone a function object that is not location-invariant or
|
|
// that cannot fit into an _Any_data structure.
|
|
static void
|
|
_M_clone(_Any_data& __dest, const _Any_data& __source, false_type)
|
|
{
|
|
__dest._M_access<_Functor*>() =
|
|
new _Functor(*__source._M_access<_Functor*>());
|
|
}
|
|
|
|
// Destroying a location-invariant object may still require
|
|
// destruction.
|
|
static void
|
|
_M_destroy(_Any_data& __victim, true_type)
|
|
{
|
|
__victim._M_access<_Functor>().~_Functor();
|
|
}
|
|
|
|
// Destroying an object located on the heap.
|
|
static void
|
|
_M_destroy(_Any_data& __victim, false_type)
|
|
{
|
|
delete __victim._M_access<_Functor*>();
|
|
}
|
|
|
|
public:
|
|
static bool
|
|
_M_manager(_Any_data& __dest, const _Any_data& __source,
|
|
_Manager_operation __op)
|
|
{
|
|
switch (__op)
|
|
{
|
|
#if __cpp_rtti
|
|
case __get_type_info:
|
|
__dest._M_access<const type_info*>() = &typeid(_Functor);
|
|
break;
|
|
#endif
|
|
case __get_functor_ptr:
|
|
__dest._M_access<_Functor*>() = _M_get_pointer(__source);
|
|
break;
|
|
|
|
case __clone_functor:
|
|
_M_clone(__dest, __source, _Local_storage());
|
|
break;
|
|
|
|
case __destroy_functor:
|
|
_M_destroy(__dest, _Local_storage());
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
_M_init_functor(_Any_data& __functor, _Functor&& __f)
|
|
{ _M_init_functor(__functor, std::move(__f), _Local_storage()); }
|
|
|
|
template<typename _Signature>
|
|
static bool
|
|
_M_not_empty_function(const function<_Signature>& __f)
|
|
{ return static_cast<bool>(__f); }
|
|
|
|
template<typename _Tp>
|
|
static bool
|
|
_M_not_empty_function(_Tp* __fp)
|
|
{ return __fp != nullptr; }
|
|
|
|
template<typename _Class, typename _Tp>
|
|
static bool
|
|
_M_not_empty_function(_Tp _Class::* __mp)
|
|
{ return __mp != nullptr; }
|
|
|
|
template<typename _Tp>
|
|
static bool
|
|
_M_not_empty_function(const _Tp&)
|
|
{ return true; }
|
|
|
|
private:
|
|
static void
|
|
_M_init_functor(_Any_data& __functor, _Functor&& __f, true_type)
|
|
{ new (__functor._M_access()) _Functor(std::move(__f)); }
|
|
|
|
static void
|
|
_M_init_functor(_Any_data& __functor, _Functor&& __f, false_type)
|
|
{ __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); }
|
|
};
|
|
|
|
template<typename _Functor>
|
|
class _Ref_manager : public _Base_manager<_Functor*>
|
|
{
|
|
typedef _Function_base::_Base_manager<_Functor*> _Base;
|
|
|
|
public:
|
|
static bool
|
|
_M_manager(_Any_data& __dest, const _Any_data& __source,
|
|
_Manager_operation __op)
|
|
{
|
|
switch (__op)
|
|
{
|
|
#if __cpp_rtti
|
|
case __get_type_info:
|
|
__dest._M_access<const type_info*>() = &typeid(_Functor);
|
|
break;
|
|
#endif
|
|
case __get_functor_ptr:
|
|
__dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);
|
|
return is_const<_Functor>::value;
|
|
break;
|
|
|
|
default:
|
|
_Base::_M_manager(__dest, __source, __op);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
_M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f)
|
|
{
|
|
_Base::_M_init_functor(__functor, std::__addressof(__f.get()));
|
|
}
|
|
};
|
|
|
|
_Function_base() : _M_manager(nullptr) { }
|
|
|
|
~_Function_base()
|
|
{
|
|
if (_M_manager)
|
|
_M_manager(_M_functor, _M_functor, __destroy_functor);
|
|
}
|
|
|
|
|
|
bool _M_empty() const { return !_M_manager; }
|
|
|
|
typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,
|
|
_Manager_operation);
|
|
|
|
_Any_data _M_functor;
|
|
_Manager_type _M_manager;
|
|
};
|
|
|
|
template<typename _Signature, typename _Functor>
|
|
class _Function_handler;
|
|
|
|
template<typename _Res, typename _Functor, typename... _ArgTypes>
|
|
class _Function_handler<_Res(_ArgTypes...), _Functor>
|
|
: public _Function_base::_Base_manager<_Functor>
|
|
{
|
|
typedef _Function_base::_Base_manager<_Functor> _Base;
|
|
|
|
public:
|
|
static _Res
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
return (*_Base::_M_get_pointer(__functor))(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _Functor, typename... _ArgTypes>
|
|
class _Function_handler<void(_ArgTypes...), _Functor>
|
|
: public _Function_base::_Base_manager<_Functor>
|
|
{
|
|
typedef _Function_base::_Base_manager<_Functor> _Base;
|
|
|
|
public:
|
|
static void
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
(*_Base::_M_get_pointer(__functor))(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _Res, typename _Functor, typename... _ArgTypes>
|
|
class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >
|
|
: public _Function_base::_Ref_manager<_Functor>
|
|
{
|
|
typedef _Function_base::_Ref_manager<_Functor> _Base;
|
|
|
|
public:
|
|
static _Res
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
return std::__callable_functor(**_Base::_M_get_pointer(__functor))(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _Functor, typename... _ArgTypes>
|
|
class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >
|
|
: public _Function_base::_Ref_manager<_Functor>
|
|
{
|
|
typedef _Function_base::_Ref_manager<_Functor> _Base;
|
|
|
|
public:
|
|
static void
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
std::__callable_functor(**_Base::_M_get_pointer(__functor))(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _Class, typename _Member, typename _Res,
|
|
typename... _ArgTypes>
|
|
class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>
|
|
: public _Function_handler<void(_ArgTypes...), _Member _Class::*>
|
|
{
|
|
typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>
|
|
_Base;
|
|
|
|
public:
|
|
static _Res
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
return std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _Class, typename _Member, typename... _ArgTypes>
|
|
class _Function_handler<void(_ArgTypes...), _Member _Class::*>
|
|
: public _Function_base::_Base_manager<
|
|
_Simple_type_wrapper< _Member _Class::* > >
|
|
{
|
|
typedef _Member _Class::* _Functor;
|
|
typedef _Simple_type_wrapper<_Functor> _Wrapper;
|
|
typedef _Function_base::_Base_manager<_Wrapper> _Base;
|
|
|
|
public:
|
|
static bool
|
|
_M_manager(_Any_data& __dest, const _Any_data& __source,
|
|
_Manager_operation __op)
|
|
{
|
|
switch (__op)
|
|
{
|
|
#if __cpp_rtti
|
|
case __get_type_info:
|
|
__dest._M_access<const type_info*>() = &typeid(_Functor);
|
|
break;
|
|
#endif
|
|
case __get_functor_ptr:
|
|
__dest._M_access<_Functor*>() =
|
|
&_Base::_M_get_pointer(__source)->__value;
|
|
break;
|
|
|
|
default:
|
|
_Base::_M_manager(__dest, __source, __op);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
_M_invoke(const _Any_data& __functor, _ArgTypes&&... __args)
|
|
{
|
|
std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(
|
|
std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
};
|
|
|
|
template<typename _From, typename _To>
|
|
using __check_func_return_type
|
|
= __or_<is_void<_To>, is_same<_From, _To>, is_convertible<_From, _To>>;
|
|
|
|
/**
|
|
* @brief Primary class template for std::function.
|
|
* @ingroup functors
|
|
*
|
|
* Polymorphic function wrapper.
|
|
*/
|
|
template<typename _Res, typename... _ArgTypes>
|
|
class function<_Res(_ArgTypes...)>
|
|
: public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,
|
|
private _Function_base
|
|
{
|
|
typedef _Res _Signature_type(_ArgTypes...);
|
|
|
|
template<typename _Func,
|
|
typename _Res2 = typename result_of<_Func(_ArgTypes...)>::type>
|
|
struct _Callable : __check_func_return_type<_Res2, _Res> { };
|
|
|
|
// Used so the return type convertibility checks aren't done when
|
|
// performing overload resolution for copy construction/assignment.
|
|
template<typename _Tp>
|
|
struct _Callable<function, _Tp> : false_type { };
|
|
|
|
template<typename _Cond, typename _Tp>
|
|
using _Requires = typename enable_if<_Cond::value, _Tp>::type;
|
|
|
|
public:
|
|
typedef _Res result_type;
|
|
|
|
// [3.7.2.1] construct/copy/destroy
|
|
|
|
/**
|
|
* @brief Default construct creates an empty function call wrapper.
|
|
* @post @c !(bool)*this
|
|
*/
|
|
function() noexcept
|
|
: _Function_base() { }
|
|
|
|
/**
|
|
* @brief Creates an empty function call wrapper.
|
|
* @post @c !(bool)*this
|
|
*/
|
|
function(nullptr_t) noexcept
|
|
: _Function_base() { }
|
|
|
|
/**
|
|
* @brief %Function copy constructor.
|
|
* @param __x A %function object with identical call signature.
|
|
* @post @c bool(*this) == bool(__x)
|
|
*
|
|
* The newly-created %function contains a copy of the target of @a
|
|
* __x (if it has one).
|
|
*/
|
|
function(const function& __x);
|
|
|
|
/**
|
|
* @brief %Function move constructor.
|
|
* @param __x A %function object rvalue with identical call signature.
|
|
*
|
|
* The newly-created %function contains the target of @a __x
|
|
* (if it has one).
|
|
*/
|
|
function(function&& __x) : _Function_base()
|
|
{
|
|
__x.swap(*this);
|
|
}
|
|
|
|
// TODO: needs allocator_arg_t
|
|
|
|
/**
|
|
* @brief Builds a %function that targets a copy of the incoming
|
|
* function object.
|
|
* @param __f A %function object that is callable with parameters of
|
|
* type @c T1, @c T2, ..., @c TN and returns a value convertible
|
|
* to @c Res.
|
|
*
|
|
* The newly-created %function object will target a copy of
|
|
* @a __f. If @a __f is @c reference_wrapper<F>, then this function
|
|
* object will contain a reference to the function object @c
|
|
* __f.get(). If @a __f is a NULL function pointer or NULL
|
|
* pointer-to-member, the newly-created object will be empty.
|
|
*
|
|
* If @a __f is a non-NULL function pointer or an object of type @c
|
|
* reference_wrapper<F>, this function will not throw.
|
|
*/
|
|
template<typename _Functor,
|
|
typename = _Requires<__not_<is_same<_Functor, function>>, void>,
|
|
typename = _Requires<_Callable<_Functor>, void>>
|
|
function(_Functor);
|
|
|
|
/**
|
|
* @brief %Function assignment operator.
|
|
* @param __x A %function with identical call signature.
|
|
* @post @c (bool)*this == (bool)x
|
|
* @returns @c *this
|
|
*
|
|
* The target of @a __x is copied to @c *this. If @a __x has no
|
|
* target, then @c *this will be empty.
|
|
*
|
|
* If @a __x targets a function pointer or a reference to a function
|
|
* object, then this operation will not throw an %exception.
|
|
*/
|
|
function&
|
|
operator=(const function& __x)
|
|
{
|
|
function(__x).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief %Function move-assignment operator.
|
|
* @param __x A %function rvalue with identical call signature.
|
|
* @returns @c *this
|
|
*
|
|
* The target of @a __x is moved to @c *this. If @a __x has no
|
|
* target, then @c *this will be empty.
|
|
*
|
|
* If @a __x targets a function pointer or a reference to a function
|
|
* object, then this operation will not throw an %exception.
|
|
*/
|
|
function&
|
|
operator=(function&& __x)
|
|
{
|
|
function(std::move(__x)).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief %Function assignment to zero.
|
|
* @post @c !(bool)*this
|
|
* @returns @c *this
|
|
*
|
|
* The target of @c *this is deallocated, leaving it empty.
|
|
*/
|
|
function&
|
|
operator=(nullptr_t) noexcept
|
|
{
|
|
if (_M_manager)
|
|
{
|
|
_M_manager(_M_functor, _M_functor, __destroy_functor);
|
|
_M_manager = nullptr;
|
|
_M_invoker = nullptr;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* @brief %Function assignment to a new target.
|
|
* @param __f A %function object that is callable with parameters of
|
|
* type @c T1, @c T2, ..., @c TN and returns a value convertible
|
|
* to @c Res.
|
|
* @return @c *this
|
|
*
|
|
* This %function object wrapper will target a copy of @a
|
|
* __f. If @a __f is @c reference_wrapper<F>, then this function
|
|
* object will contain a reference to the function object @c
|
|
* __f.get(). If @a __f is a NULL function pointer or NULL
|
|
* pointer-to-member, @c this object will be empty.
|
|
*
|
|
* If @a __f is a non-NULL function pointer or an object of type @c
|
|
* reference_wrapper<F>, this function will not throw.
|
|
*/
|
|
template<typename _Functor>
|
|
_Requires<_Callable<typename decay<_Functor>::type>, function&>
|
|
operator=(_Functor&& __f)
|
|
{
|
|
function(std::forward<_Functor>(__f)).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
/// @overload
|
|
template<typename _Functor>
|
|
function&
|
|
operator=(reference_wrapper<_Functor> __f) noexcept
|
|
{
|
|
function(__f).swap(*this);
|
|
return *this;
|
|
}
|
|
|
|
// [3.7.2.2] function modifiers
|
|
|
|
/**
|
|
* @brief Swap the targets of two %function objects.
|
|
* @param __x A %function with identical call signature.
|
|
*
|
|
* Swap the targets of @c this function object and @a __f. This
|
|
* function will not throw an %exception.
|
|
*/
|
|
void swap(function& __x)
|
|
{
|
|
std::swap(_M_functor, __x._M_functor);
|
|
std::swap(_M_manager, __x._M_manager);
|
|
std::swap(_M_invoker, __x._M_invoker);
|
|
}
|
|
|
|
// TODO: needs allocator_arg_t
|
|
/*
|
|
template<typename _Functor, typename _Alloc>
|
|
void
|
|
assign(_Functor&& __f, const _Alloc& __a)
|
|
{
|
|
function(allocator_arg, __a,
|
|
std::forward<_Functor>(__f)).swap(*this);
|
|
}
|
|
*/
|
|
|
|
// [3.7.2.3] function capacity
|
|
|
|
/**
|
|
* @brief Determine if the %function wrapper has a target.
|
|
*
|
|
* @return @c true when this %function object contains a target,
|
|
* or @c false when it is empty.
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
explicit operator bool() const noexcept
|
|
{ return !_M_empty(); }
|
|
|
|
// [3.7.2.4] function invocation
|
|
|
|
/**
|
|
* @brief Invokes the function targeted by @c *this.
|
|
* @returns the result of the target.
|
|
* @throws bad_function_call when @c !(bool)*this
|
|
*
|
|
* The function call operator invokes the target function object
|
|
* stored by @c this.
|
|
*/
|
|
_Res operator()(_ArgTypes... __args) const;
|
|
|
|
#if __cpp_rtti
|
|
// [3.7.2.5] function target access
|
|
/**
|
|
* @brief Determine the type of the target of this function object
|
|
* wrapper.
|
|
*
|
|
* @returns the type identifier of the target function object, or
|
|
* @c typeid(void) if @c !(bool)*this.
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
const type_info& target_type() const noexcept;
|
|
|
|
/**
|
|
* @brief Access the stored target function object.
|
|
*
|
|
* @return Returns a pointer to the stored target function object,
|
|
* if @c typeid(Functor).equals(target_type()); otherwise, a NULL
|
|
* pointer.
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
template<typename _Functor> _Functor* target() noexcept;
|
|
|
|
/// @overload
|
|
template<typename _Functor> const _Functor* target() const noexcept;
|
|
#endif
|
|
|
|
private:
|
|
using _Invoker_type = _Res (*)(const _Any_data&, _ArgTypes&&...);
|
|
_Invoker_type _M_invoker;
|
|
};
|
|
|
|
// Out-of-line member definitions.
|
|
template<typename _Res, typename... _ArgTypes>
|
|
function<_Res(_ArgTypes...)>::
|
|
function(const function& __x)
|
|
: _Function_base()
|
|
{
|
|
if (static_cast<bool>(__x))
|
|
{
|
|
__x._M_manager(_M_functor, __x._M_functor, __clone_functor);
|
|
_M_invoker = __x._M_invoker;
|
|
_M_manager = __x._M_manager;
|
|
}
|
|
}
|
|
|
|
template<typename _Res, typename... _ArgTypes>
|
|
template<typename _Functor, typename, typename>
|
|
function<_Res(_ArgTypes...)>::
|
|
function(_Functor __f)
|
|
: _Function_base()
|
|
{
|
|
typedef _Function_handler<_Signature_type, _Functor> _My_handler;
|
|
|
|
if (_My_handler::_M_not_empty_function(__f))
|
|
{
|
|
_My_handler::_M_init_functor(_M_functor, std::move(__f));
|
|
_M_invoker = &_My_handler::_M_invoke;
|
|
_M_manager = &_My_handler::_M_manager;
|
|
}
|
|
}
|
|
|
|
template<typename _Res, typename... _ArgTypes>
|
|
_Res
|
|
function<_Res(_ArgTypes...)>::
|
|
operator()(_ArgTypes... __args) const
|
|
{
|
|
if (_M_empty())
|
|
__throw_bad_function_call();
|
|
return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);
|
|
}
|
|
|
|
#if __cpp_rtti
|
|
template<typename _Res, typename... _ArgTypes>
|
|
const type_info&
|
|
function<_Res(_ArgTypes...)>::
|
|
target_type() const noexcept
|
|
{
|
|
if (_M_manager)
|
|
{
|
|
_Any_data __typeinfo_result;
|
|
_M_manager(__typeinfo_result, _M_functor, __get_type_info);
|
|
return *__typeinfo_result._M_access<const type_info*>();
|
|
}
|
|
else
|
|
return typeid(void);
|
|
}
|
|
|
|
template<typename _Res, typename... _ArgTypes>
|
|
template<typename _Functor>
|
|
_Functor*
|
|
function<_Res(_ArgTypes...)>::
|
|
target() noexcept
|
|
{
|
|
if (typeid(_Functor) == target_type() && _M_manager)
|
|
{
|
|
_Any_data __ptr;
|
|
if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
|
|
&& !is_const<_Functor>::value)
|
|
return 0;
|
|
else
|
|
return __ptr._M_access<_Functor*>();
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
template<typename _Res, typename... _ArgTypes>
|
|
template<typename _Functor>
|
|
const _Functor*
|
|
function<_Res(_ArgTypes...)>::
|
|
target() const noexcept
|
|
{
|
|
if (typeid(_Functor) == target_type() && _M_manager)
|
|
{
|
|
_Any_data __ptr;
|
|
_M_manager(__ptr, _M_functor, __get_functor_ptr);
|
|
return __ptr._M_access<const _Functor*>();
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// [20.7.15.2.6] null pointer comparisons
|
|
|
|
/**
|
|
* @brief Compares a polymorphic function object wrapper against 0
|
|
* (the NULL pointer).
|
|
* @returns @c true if the wrapper has no target, @c false otherwise
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
template<typename _Res, typename... _Args>
|
|
inline bool
|
|
operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
|
|
{ return !static_cast<bool>(__f); }
|
|
|
|
/// @overload
|
|
template<typename _Res, typename... _Args>
|
|
inline bool
|
|
operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
|
|
{ return !static_cast<bool>(__f); }
|
|
|
|
/**
|
|
* @brief Compares a polymorphic function object wrapper against 0
|
|
* (the NULL pointer).
|
|
* @returns @c false if the wrapper has no target, @c true otherwise
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
template<typename _Res, typename... _Args>
|
|
inline bool
|
|
operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
|
|
{ return static_cast<bool>(__f); }
|
|
|
|
/// @overload
|
|
template<typename _Res, typename... _Args>
|
|
inline bool
|
|
operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
|
|
{ return static_cast<bool>(__f); }
|
|
|
|
// [20.7.15.2.7] specialized algorithms
|
|
|
|
/**
|
|
* @brief Swap the targets of two polymorphic function object wrappers.
|
|
*
|
|
* This function will not throw an %exception.
|
|
*/
|
|
template<typename _Res, typename... _Args>
|
|
inline void
|
|
swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // C++11
|
|
|
|
#endif // _GLIBCXX_FUNCTIONAL
|