cadd2a9cb3
2009-10-05 John Bytheway <jbytheway@gmail.com> PR libstdc++/41530 * include/std/tuple (_Tuple_impl<>::_Tuple_impl(_Tuple_impl<>&&)): Fix to just move. * testsuite/20_util/tuple/cons/41530.cc: New. From-SVN: r152461
686 lines
20 KiB
C++
686 lines
20 KiB
C++
// <tuple> -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009 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 include/tuple
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_TUPLE
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#define _GLIBCXX_TUPLE 1
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#pragma GCC system_header
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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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# include <c++0x_warning.h>
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#else
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#include <utility>
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namespace std
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{
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// Adds a const reference to a non-reference type.
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template<typename _Tp>
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struct __add_c_ref
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{ typedef const _Tp& type; };
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template<typename _Tp>
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struct __add_c_ref<_Tp&>
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{ typedef _Tp& type; };
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// Adds a reference to a non-reference type.
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template<typename _Tp>
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struct __add_ref
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{ typedef _Tp& type; };
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template<typename _Tp>
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struct __add_ref<_Tp&>
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{ typedef _Tp& type; };
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template<std::size_t _Idx, typename _Head, bool _IsEmpty>
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struct _Head_base;
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template<std::size_t _Idx, typename _Head>
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struct _Head_base<_Idx, _Head, true>
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: public _Head
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{
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_Head_base()
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: _Head() { }
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_Head_base(const _Head& __h)
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: _Head(__h) { }
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template<typename _UHead>
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_Head_base(_UHead&& __h)
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: _Head(std::forward<_UHead>(__h)) { }
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_Head& _M_head() { return *this; }
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const _Head& _M_head() const { return *this; }
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void _M_swap_impl(_Head&) { /* no-op */ }
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};
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template<std::size_t _Idx, typename _Head>
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struct _Head_base<_Idx, _Head, false>
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{
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_Head_base()
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: _M_head_impl() { }
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_Head_base(const _Head& __h)
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: _M_head_impl(__h) { }
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template<typename _UHead>
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_Head_base(_UHead&& __h)
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: _M_head_impl(std::forward<_UHead>(__h)) { }
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_Head& _M_head() { return _M_head_impl; }
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const _Head& _M_head() const { return _M_head_impl; }
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void
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_M_swap_impl(_Head& __h)
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{
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using std::swap;
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swap(__h, _M_head_impl);
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}
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_Head _M_head_impl;
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};
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/**
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* Contains the actual implementation of the @c tuple template, stored
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* as a recursive inheritance hierarchy from the first element (most
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* derived class) to the last (least derived class). The @c Idx
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* parameter gives the 0-based index of the element stored at this
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* point in the hierarchy; we use it to implement a constant-time
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* get() operation.
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*/
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template<std::size_t _Idx, typename... _Elements>
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struct _Tuple_impl;
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/**
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* Zero-element tuple implementation. This is the basis case for the
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* inheritance recursion.
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*/
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template<std::size_t _Idx>
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struct _Tuple_impl<_Idx>
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{
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protected:
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void _M_swap_impl(_Tuple_impl&) { /* no-op */ }
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};
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/**
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* Recursive tuple implementation. Here we store the @c Head element
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* and derive from a @c Tuple_impl containing the remaining elements
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* (which contains the @c Tail).
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*/
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template<std::size_t _Idx, typename _Head, typename... _Tail>
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struct _Tuple_impl<_Idx, _Head, _Tail...>
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: public _Tuple_impl<_Idx + 1, _Tail...>,
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private _Head_base<_Idx, _Head, std::is_empty<_Head>::value>
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{
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typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
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typedef _Head_base<_Idx, _Head, std::is_empty<_Head>::value> _Base;
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_Head& _M_head() { return _Base::_M_head(); }
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const _Head& _M_head() const { return _Base::_M_head(); }
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_Inherited& _M_tail() { return *this; }
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const _Inherited& _M_tail() const { return *this; }
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_Tuple_impl()
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: _Inherited(), _Base() { }
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explicit
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_Tuple_impl(const _Head& __head, const _Tail&... __tail)
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: _Inherited(__tail...), _Base(__head) { }
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template<typename _UHead, typename... _UTail>
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explicit
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_Tuple_impl(_UHead&& __head, _UTail&&... __tail)
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: _Inherited(std::forward<_UTail>(__tail)...),
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_Base(std::forward<_UHead>(__head)) { }
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_Tuple_impl(const _Tuple_impl& __in)
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: _Inherited(__in._M_tail()), _Base(__in._M_head()) { }
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_Tuple_impl(_Tuple_impl&& __in)
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: _Inherited(std::move(__in._M_tail())),
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_Base(std::forward<_Head>(__in._M_head())) { }
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template<typename... _UElements>
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_Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
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: _Inherited(__in._M_tail()), _Base(__in._M_head()) { }
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template<typename... _UElements>
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_Tuple_impl(_Tuple_impl<_Idx, _UElements...>&& __in)
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: _Inherited(std::move(__in._M_tail())),
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_Base(std::move(__in._M_head())) { }
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_Tuple_impl&
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operator=(const _Tuple_impl& __in)
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{
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_M_head() = __in._M_head();
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_M_tail() = __in._M_tail();
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return *this;
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}
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_Tuple_impl&
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operator=(_Tuple_impl&& __in)
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{
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_M_head() = std::move(__in._M_head());
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_M_tail() = std::move(__in._M_tail());
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return *this;
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}
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template<typename... _UElements>
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_Tuple_impl&
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operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
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{
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_M_head() = __in._M_head();
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_M_tail() = __in._M_tail();
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return *this;
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}
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template<typename... _UElements>
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_Tuple_impl&
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operator=(_Tuple_impl<_Idx, _UElements...>&& __in)
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{
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_M_head() = std::move(__in._M_head());
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_M_tail() = std::move(__in._M_tail());
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return *this;
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}
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protected:
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void
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_M_swap_impl(_Tuple_impl& __in)
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{
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_Base::_M_swap_impl(__in._M_head());
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_Inherited::_M_swap_impl(__in._M_tail());
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}
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};
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/// tuple
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template<typename... _Elements>
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class tuple : public _Tuple_impl<0, _Elements...>
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{
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typedef _Tuple_impl<0, _Elements...> _Inherited;
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public:
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tuple()
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: _Inherited() { }
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explicit
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tuple(const _Elements&... __elements)
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: _Inherited(__elements...) { }
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template<typename... _UElements>
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explicit
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tuple(_UElements&&... __elements)
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: _Inherited(std::forward<_UElements>(__elements)...) { }
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tuple(const tuple& __in)
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: _Inherited(static_cast<const _Inherited&>(__in)) { }
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tuple(tuple&& __in)
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: _Inherited(static_cast<_Inherited&&>(__in)) { }
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template<typename... _UElements>
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tuple(const tuple<_UElements...>& __in)
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: _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
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{ }
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template<typename... _UElements>
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tuple(tuple<_UElements...>&& __in)
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: _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
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// XXX http://gcc.gnu.org/ml/libstdc++/2008-02/msg00047.html
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template<typename... _UElements>
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tuple(tuple<_UElements...>& __in)
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: _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
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{ }
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tuple&
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operator=(const tuple& __in)
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{
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static_cast<_Inherited&>(*this) = __in;
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return *this;
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}
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tuple&
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operator=(tuple&& __in)
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{
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static_cast<_Inherited&>(*this) = std::move(__in);
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return *this;
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}
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template<typename... _UElements>
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tuple&
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operator=(const tuple<_UElements...>& __in)
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{
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static_cast<_Inherited&>(*this) = __in;
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return *this;
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}
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template<typename... _UElements>
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tuple&
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operator=(tuple<_UElements...>&& __in)
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{
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static_cast<_Inherited&>(*this) = std::move(__in);
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return *this;
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}
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void
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swap(tuple& __in)
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{ _Inherited::_M_swap_impl(__in); }
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};
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template<>
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class tuple<>
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{
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public:
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void swap(tuple&) { /* no-op */ }
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};
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/// tuple (2-element), with construction and assignment from a pair.
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template<typename _T1, typename _T2>
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class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2>
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{
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typedef _Tuple_impl<0, _T1, _T2> _Inherited;
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public:
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tuple()
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: _Inherited() { }
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explicit
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tuple(const _T1& __a1, const _T2& __a2)
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: _Inherited(__a1, __a2) { }
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template<typename _U1, typename _U2>
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explicit
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tuple(_U1&& __a1, _U2&& __a2)
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: _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { }
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tuple(const tuple& __in)
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: _Inherited(static_cast<const _Inherited&>(__in)) { }
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tuple(tuple&& __in)
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: _Inherited(static_cast<_Inherited&&>(__in)) { }
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template<typename _U1, typename _U2>
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tuple(const tuple<_U1, _U2>& __in)
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: _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { }
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template<typename _U1, typename _U2>
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tuple(tuple<_U1, _U2>&& __in)
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: _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { }
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template<typename _U1, typename _U2>
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tuple(const pair<_U1, _U2>& __in)
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: _Inherited(__in.first, __in.second) { }
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template<typename _U1, typename _U2>
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tuple(pair<_U1, _U2>&& __in)
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: _Inherited(std::move(__in.first), std::move(__in.second)) { }
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tuple&
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operator=(const tuple& __in)
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{
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static_cast<_Inherited&>(*this) = __in;
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return *this;
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}
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tuple&
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operator=(tuple&& __in)
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{
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static_cast<_Inherited&>(*this) = std::move(__in);
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return *this;
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}
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template<typename _U1, typename _U2>
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tuple&
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operator=(const tuple<_U1, _U2>& __in)
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{
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static_cast<_Inherited&>(*this) = __in;
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return *this;
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}
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template<typename _U1, typename _U2>
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tuple&
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operator=(tuple<_U1, _U2>&& __in)
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{
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static_cast<_Inherited&>(*this) = std::move(__in);
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return *this;
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}
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template<typename _U1, typename _U2>
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tuple&
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operator=(const pair<_U1, _U2>& __in)
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{
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this->_M_head() = __in.first;
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this->_M_tail()._M_head() = __in.second;
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return *this;
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}
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template<typename _U1, typename _U2>
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tuple&
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operator=(pair<_U1, _U2>&& __in)
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{
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this->_M_head() = std::move(__in.first);
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this->_M_tail()._M_head() = std::move(__in.second);
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return *this;
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}
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void
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swap(tuple& __in)
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{
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using std::swap;
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swap(this->_M_head(), __in._M_head());
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swap(this->_M_tail()._M_head(), __in._M_tail()._M_head());
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}
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};
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/// Gives the type of the ith element of a given tuple type.
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template<std::size_t __i, typename _Tp>
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struct tuple_element;
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/**
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* Recursive case for tuple_element: strip off the first element in
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* the tuple and retrieve the (i-1)th element of the remaining tuple.
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*/
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template<std::size_t __i, typename _Head, typename... _Tail>
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struct tuple_element<__i, tuple<_Head, _Tail...> >
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: tuple_element<__i - 1, tuple<_Tail...> > { };
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/**
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* Basis case for tuple_element: The first element is the one we're seeking.
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*/
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template<typename _Head, typename... _Tail>
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struct tuple_element<0, tuple<_Head, _Tail...> >
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{
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typedef _Head type;
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};
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/// Finds the size of a given tuple type.
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template<typename _Tp>
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struct tuple_size;
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/// class tuple_size
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template<typename... _Elements>
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struct tuple_size<tuple<_Elements...> >
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{
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static const std::size_t value = sizeof...(_Elements);
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};
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template<typename... _Elements>
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const std::size_t tuple_size<tuple<_Elements...> >::value;
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template<std::size_t __i, typename _Head, typename... _Tail>
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inline typename __add_ref<_Head>::type
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__get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t)
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{ return __t._M_head(); }
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template<std::size_t __i, typename _Head, typename... _Tail>
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inline typename __add_c_ref<_Head>::type
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__get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t)
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{ return __t._M_head(); }
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// Return a reference (const reference) to the ith element of a tuple.
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// Any const or non-const ref elements are returned with their original type.
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template<std::size_t __i, typename... _Elements>
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inline typename __add_ref<
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typename tuple_element<__i, tuple<_Elements...> >::type
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>::type
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get(tuple<_Elements...>& __t)
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{ return __get_helper<__i>(__t); }
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template<std::size_t __i, typename... _Elements>
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inline typename __add_c_ref<
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typename tuple_element<__i, tuple<_Elements...> >::type
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>::type
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get(const tuple<_Elements...>& __t)
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{ return __get_helper<__i>(__t); }
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// This class helps construct the various comparison operations on tuples
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template<std::size_t __check_equal_size, std::size_t __i, std::size_t __j,
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typename _Tp, typename _Up>
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struct __tuple_compare;
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template<std::size_t __i, std::size_t __j, typename _Tp, typename _Up>
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struct __tuple_compare<0, __i, __j, _Tp, _Up>
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{
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static bool __eq(const _Tp& __t, const _Up& __u)
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{
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return (get<__i>(__t) == get<__i>(__u) &&
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__tuple_compare<0, __i + 1, __j, _Tp, _Up>::__eq(__t, __u));
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}
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static bool __less(const _Tp& __t, const _Up& __u)
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{
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return ((get<__i>(__t) < get<__i>(__u))
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|| !(get<__i>(__u) < get<__i>(__t)) &&
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__tuple_compare<0, __i + 1, __j, _Tp, _Up>::__less(__t, __u));
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}
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};
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template<std::size_t __i, typename _Tp, typename _Up>
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struct __tuple_compare<0, __i, __i, _Tp, _Up>
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{
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static bool __eq(const _Tp&, const _Up&)
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{ return true; }
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static bool __less(const _Tp&, const _Up&)
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{ return false; }
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};
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template<typename... _TElements, typename... _UElements>
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bool
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operator==(const tuple<_TElements...>& __t,
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const tuple<_UElements...>& __u)
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{
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typedef tuple<_TElements...> _Tp;
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typedef tuple<_UElements...> _Up;
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return (__tuple_compare<tuple_size<_Tp>::value - tuple_size<_Up>::value,
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0, tuple_size<_Tp>::value, _Tp, _Up>::__eq(__t, __u));
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}
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template<typename... _TElements, typename... _UElements>
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bool
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operator<(const tuple<_TElements...>& __t,
|
|
const tuple<_UElements...>& __u)
|
|
{
|
|
typedef tuple<_TElements...> _Tp;
|
|
typedef tuple<_UElements...> _Up;
|
|
return (__tuple_compare<tuple_size<_Tp>::value - tuple_size<_Up>::value,
|
|
0, tuple_size<_Tp>::value, _Tp, _Up>::__less(__t, __u));
|
|
}
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline bool
|
|
operator!=(const tuple<_TElements...>& __t,
|
|
const tuple<_UElements...>& __u)
|
|
{ return !(__t == __u); }
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline bool
|
|
operator>(const tuple<_TElements...>& __t,
|
|
const tuple<_UElements...>& __u)
|
|
{ return __u < __t; }
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline bool
|
|
operator<=(const tuple<_TElements...>& __t,
|
|
const tuple<_UElements...>& __u)
|
|
{ return !(__u < __t); }
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline bool
|
|
operator>=(const tuple<_TElements...>& __t,
|
|
const tuple<_UElements...>& __u)
|
|
{ return !(__t < __u); }
|
|
|
|
// NB: DR 705.
|
|
template<typename... _Elements>
|
|
inline tuple<typename __decay_and_strip<_Elements>::__type...>
|
|
make_tuple(_Elements&&... __args)
|
|
{
|
|
typedef tuple<typename __decay_and_strip<_Elements>::__type...>
|
|
__result_type;
|
|
return __result_type(std::forward<_Elements>(__args)...);
|
|
}
|
|
|
|
template<std::size_t...> struct __index_holder { };
|
|
|
|
template<std::size_t __i, typename _IdxHolder, typename... _Elements>
|
|
struct __index_holder_impl;
|
|
|
|
template<std::size_t __i, std::size_t... _Indexes, typename _IdxHolder,
|
|
typename... _Elements>
|
|
struct __index_holder_impl<__i, __index_holder<_Indexes...>,
|
|
_IdxHolder, _Elements...>
|
|
{
|
|
typedef typename __index_holder_impl<__i + 1,
|
|
__index_holder<_Indexes..., __i>,
|
|
_Elements...>::type type;
|
|
};
|
|
|
|
template<std::size_t __i, std::size_t... _Indexes>
|
|
struct __index_holder_impl<__i, __index_holder<_Indexes...> >
|
|
{ typedef __index_holder<_Indexes...> type; };
|
|
|
|
template<typename... _Elements>
|
|
struct __make_index_holder
|
|
: __index_holder_impl<0, __index_holder<>, _Elements...> { };
|
|
|
|
template<typename... _TElements, std::size_t... _TIdx,
|
|
typename... _UElements, std::size_t... _UIdx>
|
|
inline tuple<_TElements..., _UElements...>
|
|
__tuple_cat_helper(const tuple<_TElements...>& __t,
|
|
const __index_holder<_TIdx...>&,
|
|
const tuple<_UElements...>& __u,
|
|
const __index_holder<_UIdx...>&)
|
|
{ return tuple<_TElements..., _UElements...>(get<_TIdx>(__t)...,
|
|
get<_UIdx>(__u)...); }
|
|
|
|
template<typename... _TElements, std::size_t... _TIdx,
|
|
typename... _UElements, std::size_t... _UIdx>
|
|
inline tuple<_TElements..., _UElements...>
|
|
__tuple_cat_helper(tuple<_TElements...>&& __t,
|
|
const __index_holder<_TIdx...>&,
|
|
const tuple<_UElements...>& __u,
|
|
const __index_holder<_UIdx...>&)
|
|
{ return tuple<_TElements..., _UElements...>
|
|
(std::move(get<_TIdx>(__t))..., get<_UIdx>(__u)...); }
|
|
|
|
template<typename... _TElements, std::size_t... _TIdx,
|
|
typename... _UElements, std::size_t... _UIdx>
|
|
inline tuple<_TElements..., _UElements...>
|
|
__tuple_cat_helper(const tuple<_TElements...>& __t,
|
|
const __index_holder<_TIdx...>&,
|
|
tuple<_UElements...>&& __u,
|
|
const __index_holder<_UIdx...>&)
|
|
{ return tuple<_TElements..., _UElements...>
|
|
(get<_TIdx>(__t)..., std::move(get<_UIdx>(__u))...); }
|
|
|
|
template<typename... _TElements, std::size_t... _TIdx,
|
|
typename... _UElements, std::size_t... _UIdx>
|
|
inline tuple<_TElements..., _UElements...>
|
|
__tuple_cat_helper(tuple<_TElements...>&& __t,
|
|
const __index_holder<_TIdx...>&,
|
|
tuple<_UElements...>&& __u,
|
|
const __index_holder<_UIdx...>&)
|
|
{ return tuple<_TElements..., _UElements...>
|
|
(std::move(get<_TIdx>(__t))..., std::move(get<_UIdx>(__u))...); }
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline tuple<_TElements..., _UElements...>
|
|
tuple_cat(const tuple<_TElements...>& __t, const tuple<_UElements...>& __u)
|
|
{
|
|
return __tuple_cat_helper(__t, typename
|
|
__make_index_holder<_TElements...>::type(),
|
|
__u, typename
|
|
__make_index_holder<_UElements...>::type());
|
|
}
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline tuple<_TElements..., _UElements...>
|
|
tuple_cat(tuple<_TElements...>&& __t, const tuple<_UElements...>& __u)
|
|
{
|
|
return __tuple_cat_helper(std::move(__t), typename
|
|
__make_index_holder<_TElements...>::type(),
|
|
__u, typename
|
|
__make_index_holder<_UElements...>::type());
|
|
}
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline tuple<_TElements..., _UElements...>
|
|
tuple_cat(const tuple<_TElements...>& __t, tuple<_UElements...>&& __u)
|
|
{
|
|
return __tuple_cat_helper(__t, typename
|
|
__make_index_holder<_TElements...>::type(),
|
|
std::move(__u), typename
|
|
__make_index_holder<_UElements...>::type());
|
|
}
|
|
|
|
template<typename... _TElements, typename... _UElements>
|
|
inline tuple<_TElements..., _UElements...>
|
|
tuple_cat(tuple<_TElements...>&& __t, tuple<_UElements...>&& __u)
|
|
{
|
|
return __tuple_cat_helper(std::move(__t), typename
|
|
__make_index_holder<_TElements...>::type(),
|
|
std::move(__u), typename
|
|
__make_index_holder<_UElements...>::type());
|
|
}
|
|
|
|
template<typename... _Elements>
|
|
inline tuple<_Elements&...>
|
|
tie(_Elements&... __args)
|
|
{ return tuple<_Elements&...>(__args...); }
|
|
|
|
template<typename... _Elements>
|
|
inline void
|
|
swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y)
|
|
{ __x.swap(__y); }
|
|
|
|
// A class (and instance) which can be used in 'tie' when an element
|
|
// of a tuple is not required
|
|
struct _Swallow_assign
|
|
{
|
|
template<class _Tp>
|
|
_Swallow_assign&
|
|
operator=(const _Tp&)
|
|
{ return *this; }
|
|
};
|
|
|
|
// TODO: Put this in some kind of shared file.
|
|
namespace
|
|
{
|
|
_Swallow_assign ignore;
|
|
}; // anonymous namespace
|
|
}
|
|
|
|
#endif // __GXX_EXPERIMENTAL_CXX0X__
|
|
|
|
#endif // _GLIBCXX_TUPLE
|