105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
// Uses-allocator Construction -*- C++ -*-
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// Copyright (C) 2010-2015 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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#ifndef _USES_ALLOCATOR_H
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#define _USES_ALLOCATOR_H 1
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
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#else
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#include <type_traits>
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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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/// [allocator.tag]
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struct allocator_arg_t { };
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constexpr allocator_arg_t allocator_arg = allocator_arg_t();
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template<typename _Tp, typename _Alloc, typename = __void_t<>>
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struct __uses_allocator_helper
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: false_type { };
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template<typename _Tp, typename _Alloc>
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struct __uses_allocator_helper<_Tp, _Alloc,
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__void_t<typename _Tp::allocator_type>>
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: is_convertible<_Alloc, typename _Tp::allocator_type>::type
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{ };
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/// [allocator.uses.trait]
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template<typename _Tp, typename _Alloc>
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struct uses_allocator
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: __uses_allocator_helper<_Tp, _Alloc>::type
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{ };
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struct __uses_alloc_base { };
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struct __uses_alloc0 : __uses_alloc_base
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{
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struct _Sink { void operator=(const void*) { } } _M_a;
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};
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template<typename _Alloc>
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struct __uses_alloc1 : __uses_alloc_base { const _Alloc* _M_a; };
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template<typename _Alloc>
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struct __uses_alloc2 : __uses_alloc_base { const _Alloc* _M_a; };
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template<bool, typename _Tp, typename _Alloc, typename... _Args>
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struct __uses_alloc;
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template<typename _Tp, typename _Alloc, typename... _Args>
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struct __uses_alloc<true, _Tp, _Alloc, _Args...>
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: conditional<
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is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value,
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__uses_alloc1<_Alloc>,
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__uses_alloc2<_Alloc>>::type
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{ };
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template<typename _Tp, typename _Alloc, typename... _Args>
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struct __uses_alloc<false, _Tp, _Alloc, _Args...>
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: __uses_alloc0 { };
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template<typename _Tp, typename _Alloc, typename... _Args>
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using __uses_alloc_t =
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__uses_alloc<uses_allocator<_Tp, _Alloc>::value, _Tp, _Alloc, _Args...>;
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template<typename _Tp, typename _Alloc, typename... _Args>
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inline __uses_alloc_t<_Tp, _Alloc, _Args...>
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__use_alloc(const _Alloc& __a)
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{
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__uses_alloc_t<_Tp, _Alloc, _Args...> __ret;
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__ret._M_a = &__a;
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return __ret;
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif
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#endif
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