507 lines
13 KiB
C++
507 lines
13 KiB
C++
// unique_ptr implementation -*- C++ -*-
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// Copyright (C) 2008, 2009, 2010 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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/** @file bits/unique_ptr.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{memory}
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*/
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#ifndef _UNIQUE_PTR_H
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#define _UNIQUE_PTR_H 1
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#include <bits/c++config.h>
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#include <debug/debug.h>
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#include <type_traits>
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#include <utility>
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#include <tuple>
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_GLIBCXX_BEGIN_NAMESPACE(std)
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/**
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* @addtogroup pointer_abstractions
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* @{
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*/
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/// Primary template, default_delete.
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template<typename _Tp>
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struct default_delete
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{
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constexpr default_delete() { }
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template<typename _Up, typename = typename
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std::enable_if<std::is_convertible<_Up*, _Tp*>::value>::type>
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default_delete(const default_delete<_Up>&) { }
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void
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operator()(_Tp* __ptr) const
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{
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static_assert(sizeof(_Tp)>0,
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"can't delete pointer to incomplete type");
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delete __ptr;
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}
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};
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 740 - omit specialization for array objects with a compile time length
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/// Specialization, default_delete.
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template<typename _Tp>
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struct default_delete<_Tp[]>
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{
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constexpr default_delete() { }
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void
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operator()(_Tp* __ptr) const
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{
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static_assert(sizeof(_Tp)>0,
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"can't delete pointer to incomplete type");
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delete [] __ptr;
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}
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};
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/// 20.7.12.2 unique_ptr for single objects.
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template <typename _Tp, typename _Dp = default_delete<_Tp> >
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class unique_ptr
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{
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// use SFINAE to determine whether _Del::pointer exists
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class _Pointer
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{
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template<typename _Up>
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static typename _Up::pointer __test(typename _Up::pointer*);
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template<typename _Up>
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static _Tp* __test(...);
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typedef typename remove_reference<_Dp>::type _Del;
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public:
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typedef decltype( __test<_Del>(0)) type;
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};
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typedef std::tuple<_Tp*, _Dp> __tuple_type;
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__tuple_type _M_t;
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public:
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typedef typename _Pointer::type pointer;
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typedef _Tp element_type;
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typedef _Dp deleter_type;
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// Constructors.
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constexpr unique_ptr()
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: _M_t()
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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explicit
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unique_ptr(pointer __p)
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: _M_t(__p, deleter_type())
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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unique_ptr(pointer __p,
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typename std::conditional<std::is_reference<deleter_type>::value,
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deleter_type, const deleter_type&>::type __d)
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: _M_t(__p, __d) { }
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unique_ptr(pointer __p,
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typename std::remove_reference<deleter_type>::type&& __d)
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: _M_t(std::move(__p), std::move(__d))
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{ static_assert(!std::is_reference<deleter_type>::value,
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"rvalue deleter bound to reference"); }
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constexpr unique_ptr(nullptr_t)
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: _M_t()
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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// Move constructors.
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unique_ptr(unique_ptr&& __u)
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: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
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template<typename _Up, typename _Ep, typename = typename
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std::enable_if
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<std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
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pointer>::value
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&& !std::is_array<_Up>::value
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&& ((std::is_reference<_Dp>::value
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&& std::is_same<_Ep, _Dp>::value)
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|| (!std::is_reference<_Dp>::value
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&& std::is_convertible<_Ep, _Dp>::value))>
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::type>
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unique_ptr(unique_ptr<_Up, _Ep>&& __u)
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: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
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{ }
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#if _GLIBCXX_DEPRECATED
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template<typename _Up, typename = typename
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std::enable_if<std::is_convertible<_Up*, _Tp*>::value
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&& std::is_same<_Dp,
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default_delete<_Tp>>::value>::type>
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unique_ptr(auto_ptr<_Up>&& __u)
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: _M_t(__u.release(), deleter_type()) { }
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#endif
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// Destructor.
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~unique_ptr() { reset(); }
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// Assignment.
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unique_ptr&
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operator=(unique_ptr&& __u)
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{
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reset(__u.release());
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get_deleter() = std::move(__u.get_deleter());
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return *this;
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}
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template<typename _Up, typename _Ep, typename = typename
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std::enable_if
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<std::is_convertible<typename unique_ptr<_Up, _Ep>::pointer,
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pointer>::value
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&& !std::is_array<_Up>::value>::type>
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unique_ptr&
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operator=(unique_ptr<_Up, _Ep>&& __u)
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{
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reset(__u.release());
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get_deleter() = std::move(__u.get_deleter());
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return *this;
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}
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unique_ptr&
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operator=(nullptr_t)
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{
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reset();
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return *this;
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}
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// Observers.
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typename std::add_lvalue_reference<element_type>::type
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operator*() const
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{
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_GLIBCXX_DEBUG_ASSERT(get() != pointer());
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return *get();
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}
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pointer
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operator->() const
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{
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_GLIBCXX_DEBUG_ASSERT(get() != pointer());
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return get();
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}
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pointer
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get() const
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{ return std::get<0>(_M_t); }
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deleter_type&
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get_deleter()
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{ return std::get<1>(_M_t); }
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const deleter_type&
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get_deleter() const
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{ return std::get<1>(_M_t); }
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explicit operator bool() const
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{ return get() == pointer() ? false : true; }
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// Modifiers.
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pointer
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release()
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{
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pointer __p = get();
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std::get<0>(_M_t) = pointer();
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return __p;
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}
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void
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reset(pointer __p = pointer())
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{
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using std::swap;
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swap(std::get<0>(_M_t), __p);
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if (__p != pointer())
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get_deleter()(__p);
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}
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void
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swap(unique_ptr& __u)
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{
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using std::swap;
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swap(_M_t, __u._M_t);
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}
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// Disable copy from lvalue.
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unique_ptr(const unique_ptr&) = delete;
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unique_ptr& operator=(const unique_ptr&) = delete;
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};
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/// 20.7.12.3 unique_ptr for array objects with a runtime length
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// [unique.ptr.runtime]
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 740 - omit specialization for array objects with a compile time length
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template<typename _Tp, typename _Dp>
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class unique_ptr<_Tp[], _Dp>
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{
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typedef std::tuple<_Tp*, _Dp> __tuple_type;
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__tuple_type _M_t;
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public:
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typedef _Tp* pointer;
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typedef _Tp element_type;
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typedef _Dp deleter_type;
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// Constructors.
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constexpr unique_ptr()
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: _M_t()
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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explicit
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unique_ptr(pointer __p)
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: _M_t(__p, deleter_type())
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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unique_ptr(pointer __p,
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typename std::conditional<std::is_reference<deleter_type>::value,
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deleter_type, const deleter_type&>::type __d)
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: _M_t(__p, __d) { }
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unique_ptr(pointer __p,
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typename std::remove_reference<deleter_type>::type && __d)
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: _M_t(std::move(__p), std::move(__d))
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{ static_assert(!std::is_reference<deleter_type>::value,
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"rvalue deleter bound to reference"); }
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constexpr unique_ptr(nullptr_t)
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: _M_t()
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{ static_assert(!std::is_pointer<deleter_type>::value,
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"constructed with null function pointer deleter"); }
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// Move constructors.
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unique_ptr(unique_ptr&& __u)
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: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
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template<typename _Up, typename _Ep>
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unique_ptr(unique_ptr<_Up, _Ep>&& __u)
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: _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter()))
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{ }
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// Destructor.
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~unique_ptr() { reset(); }
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// Assignment.
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unique_ptr&
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operator=(unique_ptr&& __u)
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{
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reset(__u.release());
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get_deleter() = std::move(__u.get_deleter());
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return *this;
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}
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template<typename _Up, typename _Ep>
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unique_ptr&
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operator=(unique_ptr<_Up, _Ep>&& __u)
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{
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reset(__u.release());
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get_deleter() = std::move(__u.get_deleter());
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return *this;
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}
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unique_ptr&
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operator=(nullptr_t)
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{
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reset();
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return *this;
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}
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// Observers.
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typename std::add_lvalue_reference<element_type>::type
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operator[](size_t __i) const
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{
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_GLIBCXX_DEBUG_ASSERT(get() != pointer());
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return get()[__i];
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}
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pointer
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get() const
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{ return std::get<0>(_M_t); }
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deleter_type&
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get_deleter()
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{ return std::get<1>(_M_t); }
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const deleter_type&
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get_deleter() const
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{ return std::get<1>(_M_t); }
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explicit operator bool() const
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{ return get() == pointer() ? false : true; }
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// Modifiers.
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pointer
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release()
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{
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pointer __p = get();
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std::get<0>(_M_t) = pointer();
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return __p;
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}
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void
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reset(pointer __p = pointer())
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{
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using std::swap;
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swap(std::get<0>(_M_t), __p);
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if (__p != nullptr)
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get_deleter()(__p);
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}
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void
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reset(nullptr_t)
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{
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pointer __p = get();
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std::get<0>(_M_t) = pointer();
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if (__p != nullptr)
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get_deleter()(__p);
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}
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// DR 821.
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template<typename _Up>
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void reset(_Up) = delete;
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void
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swap(unique_ptr& __u)
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{
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using std::swap;
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swap(_M_t, __u._M_t);
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}
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// Disable copy from lvalue.
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unique_ptr(const unique_ptr&) = delete;
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unique_ptr& operator=(const unique_ptr&) = delete;
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// Disable construction from convertible pointer types.
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// (N2315 - 20.6.5.3.1)
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template<typename _Up>
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unique_ptr(_Up*, typename
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std::conditional<std::is_reference<deleter_type>::value,
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deleter_type, const deleter_type&>::type,
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typename std::enable_if<std::is_convertible<_Up*,
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pointer>::value>::type* = 0) = delete;
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template<typename _Up>
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unique_ptr(_Up*, typename std::remove_reference<deleter_type>::type&&,
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typename std::enable_if<std::is_convertible<_Up*,
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pointer>::value>::type* = 0) = delete;
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template<typename _Up>
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explicit
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unique_ptr(_Up*, typename std::enable_if<std::is_convertible<_Up*,
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pointer>::value>::type* = 0) = delete;
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};
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template<typename _Tp, typename _Dp>
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inline void
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swap(unique_ptr<_Tp, _Dp>& __x,
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unique_ptr<_Tp, _Dp>& __y)
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{ __x.swap(__y); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator==(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return __x.get() == __y.get(); }
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template<typename _Tp, typename _Dp>
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inline bool
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operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
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{ return __x.get() == nullptr; }
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template<typename _Tp, typename _Dp>
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inline bool
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operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
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{ return nullptr == __y.get(); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator!=(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return !(__x.get() == __y.get()); }
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template<typename _Tp, typename _Dp>
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inline bool
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operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
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{ return __x.get() != nullptr; }
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template<typename _Tp, typename _Dp>
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inline bool
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operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __y)
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{ return nullptr != __y.get(); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator<(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return __x.get() < __y.get(); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator<=(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return !(__y.get() < __x.get()); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator>(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return __y.get() < __x.get(); }
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template<typename _Tp, typename _Dp,
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typename _Up, typename _Ep>
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inline bool
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operator>=(const unique_ptr<_Tp, _Dp>& __x,
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const unique_ptr<_Up, _Ep>& __y)
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{ return !(__x.get() < __y.get()); }
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/// std::hash specialization for unique_ptr.
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template<typename _Tp, typename _Dp>
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struct hash<unique_ptr<_Tp, _Dp>>
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: public std::unary_function<unique_ptr<_Tp, _Dp>, size_t>
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{
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size_t
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operator()(const unique_ptr<_Tp, _Dp>& __u) const
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{
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typedef unique_ptr<_Tp, _Dp> _UP;
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return std::hash<typename _UP::pointer>()(__u.get());
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}
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};
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// @} group pointer_abstractions
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_GLIBCXX_END_NAMESPACE
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#endif /* _UNIQUE_PTR_H */
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