ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / include / c++ / 11 / bits

// Utility functions for uses-allocator construction -*- C++ -*-

// Copyright (C) 2019-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file include/bits/uses_allocator_args.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{memory}
 */

#ifndef _USES_ALLOCATOR_ARGS
#define _USES_ALLOCATOR_ARGS 1

#pragma GCC system_header

#if __cplusplus > 201703L && __cpp_concepts

#include <new>			// for placement operator new
#include <tuple>		// for tuple, make_tuple, make_from_tuple
#include <bits/stl_construct.h> // construct_at
#include <bits/stl_pair.h>      // pair

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
  template<typename _Tp>
    inline constexpr bool __is_pair = false;
  template<typename _Tp, typename _Up>
    inline constexpr bool __is_pair<pair<_Tp, _Up>> = true;
  template<typename _Tp, typename _Up>
    inline constexpr bool __is_pair<const pair<_Tp, _Up>> = true;

template<typename _Tp>
    concept _Std_pair = __is_pair<_Tp>;

/** @addtogroup allocators
 *  @{
 */

// Not specified by C++20, used internally
#define __cpp_lib_make_obj_using_allocator 201811L

template<typename _Tp, typename _Alloc, typename... _Args>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a,
				     _Args&&... __args) noexcept
    requires (! _Std_pair<_Tp>)
    {
      if constexpr (uses_allocator_v<remove_cv_t<_Tp>, _Alloc>)
	{
	  if constexpr (is_constructible_v<_Tp, allocator_arg_t,
					   const _Alloc&, _Args...>)
	    {
	      return tuple<allocator_arg_t, const _Alloc&, _Args&&...>(
		  allocator_arg, __a, std::forward<_Args>(__args)...);
	    }
	  else
	    {
	      static_assert(is_constructible_v<_Tp, _Args..., const _Alloc&>,
		  "construction with an allocator must be possible"
		  " if uses_allocator is true");

return tuple<_Args&&..., const _Alloc&>(
		  std::forward<_Args>(__args)..., __a);
	    }
	}
      else
	{
	  static_assert(is_constructible_v<_Tp, _Args...>);

return tuple<_Args&&...>(std::forward<_Args>(__args)...);
	}
    }

template<_Std_pair _Tp, typename _Alloc>
    constexpr auto
    uses_allocator_construction_args(const _Alloc&) noexcept;

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc&, _Up&&, _Vp&&) noexcept;

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc&,
				     const pair<_Up, _Vp>&) noexcept;

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc&, pair<_Up, _Vp>&&) noexcept;

template<_Std_pair _Tp, typename _Alloc, typename _Tuple1, typename _Tuple2>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a, piecewise_construct_t,
				     _Tuple1&& __x, _Tuple2&& __y) noexcept
    {
      using _Tp1 = typename _Tp::first_type;
      using _Tp2 = typename _Tp::second_type;

return std::make_tuple(piecewise_construct,
	  std::apply([&__a](auto&&... __args1) {
	      return std::uses_allocator_construction_args<_Tp1>(
		  __a, std::forward<decltype(__args1)>(__args1)...);
	  }, std::forward<_Tuple1>(__x)),
	  std::apply([&__a](auto&&... __args2) {
	      return std::uses_allocator_construction_args<_Tp2>(
		  __a, std::forward<decltype(__args2)>(__args2)...);
	  }, std::forward<_Tuple2>(__y)));
    }

template<_Std_pair _Tp, typename _Alloc>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a) noexcept
    {
      using _Tp1 = typename _Tp::first_type;
      using _Tp2 = typename _Tp::second_type;

return std::make_tuple(piecewise_construct,
	  std::uses_allocator_construction_args<_Tp1>(__a),
	  std::uses_allocator_construction_args<_Tp2>(__a));
    }

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a, _Up&& __u, _Vp&& __v)
      noexcept
    {
      using _Tp1 = typename _Tp::first_type;
      using _Tp2 = typename _Tp::second_type;

return std::make_tuple(piecewise_construct,
	  std::uses_allocator_construction_args<_Tp1>(__a,
	    std::forward<_Up>(__u)),
	  std::uses_allocator_construction_args<_Tp2>(__a,
	    std::forward<_Vp>(__v)));
    }

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a,
				     const pair<_Up, _Vp>& __pr) noexcept
    {
      using _Tp1 = typename _Tp::first_type;
      using _Tp2 = typename _Tp::second_type;

return std::make_tuple(piecewise_construct,
	  std::uses_allocator_construction_args<_Tp1>(__a, __pr.first),
	  std::uses_allocator_construction_args<_Tp2>(__a, __pr.second));
    }

template<_Std_pair _Tp, typename _Alloc, typename _Up, typename _Vp>
    constexpr auto
    uses_allocator_construction_args(const _Alloc& __a,
				     pair<_Up, _Vp>&& __pr) noexcept
    {
      using _Tp1 = typename _Tp::first_type;
      using _Tp2 = typename _Tp::second_type;

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 3527. uses_allocator_construction_args handles rvalue pairs
      // of rvalue references incorrectly
      return std::make_tuple(piecewise_construct,
	  std::uses_allocator_construction_args<_Tp1>(__a,
	    std::get<0>(std::move(__pr))),
	  std::uses_allocator_construction_args<_Tp2>(__a,
	    std::get<1>(std::move(__pr))));
    }

template<typename _Tp, typename _Alloc, typename... _Args>
    constexpr _Tp
    make_obj_using_allocator(const _Alloc& __a, _Args&&... __args)
    {
      return std::make_from_tuple<_Tp>(
	  std::uses_allocator_construction_args<_Tp>(__a,
	    std::forward<_Args>(__args)...));
    }

template<typename _Tp, typename _Alloc, typename... _Args>
    constexpr _Tp*
    uninitialized_construct_using_allocator(_Tp* __p, const _Alloc& __a,
					    _Args&&... __args)
    {
      return std::apply([&](auto&&... __xs) {
	return std::construct_at(__p, std::forward<decltype(__xs)>(__xs)...);
      }, std::uses_allocator_construction_args<_Tp>(__a,
	std::forward<_Args>(__args)...));
    }
/// @}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // C++20
#endif // _USES_ALLOCATOR_ARGS

[+] ..
[-] atomic_futex.h [edit]
[-] random.h [edit]
[-] functexcept.h [edit]
[-] exception.h [edit]
[-] regex.tcc [edit]
[-] char_traits.h [edit]
[-] uses_allocator.h [edit]
[-] specfun.h [edit]
[-] regex_automaton.tcc [edit]
[-] stl_stack.h [edit]
[-] node_handle.h [edit]
[-] regex_error.h [edit]
[-] stl_list.h [edit]
[-] vector.tcc [edit]
[-] stl_algobase.h [edit]
[-] regex_automaton.h [edit]
[-] cxxabi_init_exception.h [edit]
[-] basic_ios.tcc [edit]
[-] deque.tcc [edit]
[-] fs_fwd.h [edit]
[-] concept_check.h [edit]
[-] stl_algo.h [edit]
[-] functional_hash.h [edit]
[-] random.tcc [edit]
[-] fs_path.h [edit]
[-] max_size_type.h [edit]
[-] nested_exception.h [edit]
[-] atomic_base.h [edit]
[-] charconv.h [edit]
[-] ostream.tcc [edit]
[-] predefined_ops.h [edit]
[-] boost_concept_check.h [edit]
[-] atomic_lockfree_defines.h [edit]
[-] stl_construct.h [edit]
[-] list.tcc [edit]
[-] locale_classes.tcc [edit]
[-] uniform_int_dist.h [edit]
[-] semaphore_base.h [edit]
[-] mask_array.h [edit]
[-] ranges_algobase.h [edit]
[-] stl_heap.h [edit]
[-] alloc_traits.h [edit]
[-] string_view.tcc [edit]
[-] sstream.tcc [edit]
[-] regex_executor.tcc [edit]
[-] cpp_type_traits.h [edit]
[-] stl_map.h [edit]
[-] hashtable_policy.h [edit]
[-] regex_scanner.tcc [edit]
[-] ranges_base.h [edit]
[-] forward_list.h [edit]
[-] allocator.h [edit]
[-] codecvt.h [edit]
[-] istream.tcc [edit]
[-] memoryfwd.h [edit]
[-] stl_vector.h [edit]
[-] valarray_array.tcc [edit]
[-] valarray_array.h [edit]
[-] locale_facets.tcc [edit]
[-] stl_tree.h [edit]
[-] atomic_timed_wait.h [edit]
[-] streambuf_iterator.h [edit]
[-] unique_lock.h [edit]
[-] exception_defines.h [edit]
[-] stl_raw_storage_iter.h [edit]
[-] locale_facets_nonio.tcc [edit]
[-] regex.h [edit]
[-] stl_tempbuf.h [edit]
[-] unordered_map.h [edit]
[-] std_mutex.h [edit]
[-] regex_scanner.h [edit]
[-] locale_facets_nonio.h [edit]
[-] basic_string.h [edit]
[-] locale_classes.h [edit]
[-] regex_executor.h [edit]
[-] stl_multiset.h [edit]
[-] postypes.h [edit]
[-] stl_multimap.h [edit]
[-] std_thread.h [edit]
[-] atomic_wait.h [edit]
[-] fs_dir.h [edit]
[-] exception_ptr.h [edit]
[-] move.h [edit]
[-] erase_if.h [edit]
[-] valarray_after.h [edit]
[-] hash_bytes.h [edit]
[-] ranges_cmp.h [edit]
[-] ios_base.h [edit]
[-] invoke.h [edit]
[-] stream_iterator.h [edit]
[-] std_function.h [edit]
[-] stl_iterator.h [edit]
[-] slice_array.h [edit]
[-] stringfwd.h [edit]
[-] stl_function.h [edit]
[-] forward_list.tcc [edit]
[-] stl_iterator_base_funcs.h [edit]
[-] refwrap.h [edit]
[-] unordered_set.h [edit]
[-] stl_uninitialized.h [edit]
[-] streambuf.tcc [edit]
[-] algorithmfwd.h [edit]
[-] range_access.h [edit]
[-] enable_special_members.h [edit]
[-] unique_ptr.h [edit]
[-] localefwd.h [edit]
[-] quoted_string.h [edit]
[-] uses_allocator_args.h [edit]
[-] stl_queue.h [edit]
[-] gslice_array.h [edit]
[-] ptr_traits.h [edit]
[-] ranges_algo.h [edit]
[-] cxxabi_forced.h [edit]
[-] std_abs.h [edit]
[-] align.h [edit]
[-] regex_compiler.h [edit]
[-] stl_relops.h [edit]
[-] indirect_array.h [edit]
[-] regex_constants.h [edit]
[-] stl_bvector.h [edit]
[-] fs_ops.h [edit]
[-] parse_numbers.h [edit]
[-] shared_ptr_base.h [edit]
[-] c++0x_warning.h [edit]
[-] basic_string.tcc [edit]
[-] stl_deque.h [edit]
[-] ranges_uninitialized.h [edit]
[-] hashtable.h [edit]
[-] iterator_concepts.h [edit]
[-] stl_iterator_base_types.h [edit]
[-] locale_conv.h [edit]
[-] stl_pair.h [edit]
[-] shared_ptr_atomic.h [edit]
[-] ranges_util.h [edit]
[-] valarray_before.h [edit]
[-] stl_set.h [edit]
[-] stl_numeric.h [edit]
[-] locale_facets.h [edit]
[-] gslice.h [edit]
[-] shared_ptr.h [edit]
[-] ostream_insert.h [edit]
[-] fstream.tcc [edit]
[-] this_thread_sleep.h [edit]
[-] basic_ios.h [edit]
[-] allocated_ptr.h [edit]
[-] regex_compiler.tcc [edit]