1373 lines
45 KiB
C++
1373 lines
45 KiB
C++
// Raw memory manipulators -*- C++ -*-
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// Copyright (C) 2001-2025 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1996,1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/stl_uninitialized.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 _STL_UNINITIALIZED_H
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#define _STL_UNINITIALIZED_H 1
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#if __cplusplus >= 201103L
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# include <type_traits>
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# include <bits/ptr_traits.h> // to_address
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# include <bits/stl_pair.h> // pair
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# include <bits/stl_algobase.h> // fill, fill_n
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#endif
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#include <bits/cpp_type_traits.h> // __is_pointer
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#include <bits/stl_iterator_base_funcs.h> // distance, advance
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#include <bits/stl_iterator.h> // __niter_base
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#include <ext/alloc_traits.h> // __alloc_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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/** @addtogroup memory
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* @{
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*/
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/// @cond undocumented
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template<typename _ForwardIterator, typename _Alloc = void>
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struct _UninitDestroyGuard
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{
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_GLIBCXX20_CONSTEXPR
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explicit
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_UninitDestroyGuard(_ForwardIterator& __first, _Alloc& __a)
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: _M_first(__first), _M_cur(__builtin_addressof(__first)), _M_alloc(__a)
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{ }
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_GLIBCXX20_CONSTEXPR
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~_UninitDestroyGuard()
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{
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if (__builtin_expect(_M_cur != 0, 0))
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std::_Destroy(_M_first, *_M_cur, _M_alloc);
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}
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_GLIBCXX20_CONSTEXPR
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void release() { _M_cur = 0; }
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private:
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_ForwardIterator const _M_first;
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_ForwardIterator* _M_cur;
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_Alloc& _M_alloc;
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_UninitDestroyGuard(const _UninitDestroyGuard&);
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};
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template<typename _ForwardIterator>
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struct _UninitDestroyGuard<_ForwardIterator, void>
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{
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_GLIBCXX20_CONSTEXPR
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explicit
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_UninitDestroyGuard(_ForwardIterator& __first)
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: _M_first(__first), _M_cur(__builtin_addressof(__first))
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{ }
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_GLIBCXX20_CONSTEXPR
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~_UninitDestroyGuard()
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{
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if (__builtin_expect(_M_cur != 0, 0))
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std::_Destroy(_M_first, *_M_cur);
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}
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_GLIBCXX20_CONSTEXPR
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void release() { _M_cur = 0; }
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_ForwardIterator const _M_first;
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_ForwardIterator* _M_cur;
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private:
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_UninitDestroyGuard(const _UninitDestroyGuard&);
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};
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// This is the default implementation of std::uninitialized_copy.
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// This can be used with C++20 iterators and non-common ranges.
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template<typename _InputIterator, typename _Sentinel,
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typename _ForwardIterator>
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_GLIBCXX20_CONSTEXPR
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_ForwardIterator
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__do_uninit_copy(_InputIterator __first, _Sentinel __last,
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_ForwardIterator __result)
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{
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_UninitDestroyGuard<_ForwardIterator> __guard(__result);
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for (; __first != __last; ++__first, (void)++__result)
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std::_Construct(std::__addressof(*__result), *__first);
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__guard.release();
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return __result;
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}
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#if __cplusplus < 201103L
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// True if we can unwrap _Iter to get a pointer by using std::__niter_base.
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template<typename _Iter,
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typename _Base = __decltype(std::__niter_base(*(_Iter*)0))>
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struct __unwrappable_niter
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{ enum { __value = false }; };
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template<typename _Iter, typename _Tp>
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struct __unwrappable_niter<_Iter, _Tp*>
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{ enum { __value = true }; };
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// Use template specialization for C++98 when 'if constexpr' can't be used.
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template<bool _CanMemcpy>
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struct __uninitialized_copy
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{
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template<typename _InputIterator, typename _ForwardIterator>
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static _ForwardIterator
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__uninit_copy(_InputIterator __first, _InputIterator __last,
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_ForwardIterator __result)
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{ return std::__do_uninit_copy(__first, __last, __result); }
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};
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template<>
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struct __uninitialized_copy<true>
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{
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// Overload for generic iterators.
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template<typename _InputIterator, typename _ForwardIterator>
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static _ForwardIterator
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__uninit_copy(_InputIterator __first, _InputIterator __last,
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_ForwardIterator __result)
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{
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if (__unwrappable_niter<_InputIterator>::__value
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&& __unwrappable_niter<_ForwardIterator>::__value)
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{
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__uninit_copy(std::__niter_base(__first),
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std::__niter_base(__last),
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std::__niter_base(__result));
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std::advance(__result, std::distance(__first, __last));
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return __result;
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}
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else
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return std::__do_uninit_copy(__first, __last, __result);
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}
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// Overload for pointers.
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template<typename _Tp, typename _Up>
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static _Up*
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__uninit_copy(_Tp* __first, _Tp* __last, _Up* __result)
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{
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// Ensure that we don't successfully memcpy in cases that should be
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// ill-formed because is_constructible<_Up, _Tp&> is false.
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typedef __typeof__(static_cast<_Up>(*__first)) __check
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__attribute__((__unused__));
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const ptrdiff_t __n = __last - __first;
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if (__builtin_expect(__n > 0, true))
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{
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__builtin_memcpy(__result, __first, __n * sizeof(_Tp));
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__result += __n;
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}
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return __result;
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}
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};
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#endif
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/// @endcond
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wc++17-extensions"
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/**
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* @brief Copies the range [first,last) into result.
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* @param __first An input iterator.
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* @param __last An input iterator.
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* @param __result A forward iterator.
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* @return __result + (__last - __first)
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*
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* Like std::copy, but does not require an initialized output range.
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*/
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template<typename _InputIterator, typename _ForwardIterator>
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_GLIBCXX26_CONSTEXPR
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inline _ForwardIterator
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uninitialized_copy(_InputIterator __first, _InputIterator __last,
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_ForwardIterator __result)
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{
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// We can use memcpy to copy the ranges under these conditions:
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//
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// _ForwardIterator and _InputIterator are both contiguous iterators,
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// so that we can turn them into pointers to pass to memcpy.
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// Before C++20 we can't detect all contiguous iterators, so we only
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// handle built-in pointers and __normal_iterator<T*, C> types.
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//
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// The value types of both iterators are trivially-copyable types,
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// so that memcpy is not undefined and can begin the lifetime of
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// new objects in the output range.
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//
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// Finally, memcpy from the source type, S, to the destination type, D,
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// must give the same value as initialization of D from S would give.
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// We require is_trivially_constructible<D, S> to be true, but that is
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// not sufficient. Some cases of trivial initialization are not just a
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// bitwise copy, even when sizeof(D) == sizeof(S),
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// e.g. bit_cast<unsigned>(1.0f) != 1u because the corresponding bits
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// of the value representations do not have the same meaning.
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// We cannot tell when this condition is true in general,
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// so we rely on the __memcpyable trait.
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#if __cplusplus >= 201103L
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using _Dest = decltype(std::__niter_base(__result));
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using _Src = decltype(std::__niter_base(__first));
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using _ValT = typename iterator_traits<_ForwardIterator>::value_type;
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#if __glibcxx_raw_memory_algorithms >= 202411L // >= C++26
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if consteval {
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return std::__do_uninit_copy(__first, __last, __result);
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}
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#endif
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if constexpr (!__is_trivially_constructible(_ValT, decltype(*__first)))
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return std::__do_uninit_copy(__first, __last, __result);
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else if constexpr (__memcpyable<_Dest, _Src>::__value)
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{
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ptrdiff_t __n = __last - __first;
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if (__n > 0) [[__likely__]]
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{
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using _ValT = typename remove_pointer<_Src>::type;
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__builtin_memcpy(std::__niter_base(__result),
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std::__niter_base(__first),
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__n * sizeof(_ValT));
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__result += __n;
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}
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return __result;
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}
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#if __cpp_lib_concepts
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else if constexpr (contiguous_iterator<_ForwardIterator>
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&& contiguous_iterator<_InputIterator>)
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{
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using _DestPtr = decltype(std::to_address(__result));
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using _SrcPtr = decltype(std::to_address(__first));
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if constexpr (__memcpyable<_DestPtr, _SrcPtr>::__value)
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{
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if (auto __n = __last - __first; __n > 0) [[likely]]
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{
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void* __dest = std::to_address(__result);
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const void* __src = std::to_address(__first);
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size_t __nbytes = __n * sizeof(remove_pointer_t<_DestPtr>);
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__builtin_memcpy(__dest, __src, __nbytes);
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__result += __n;
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}
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return __result;
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}
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else
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return std::__do_uninit_copy(__first, __last, __result);
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}
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#endif
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else
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return std::__do_uninit_copy(__first, __last, __result);
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#else // C++98
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typedef typename iterator_traits<_InputIterator>::value_type
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_ValueType1;
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typedef typename iterator_traits<_ForwardIterator>::value_type
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_ValueType2;
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const bool __can_memcpy
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= __memcpyable<_ValueType1*, _ValueType2*>::__value
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&& __is_trivially_constructible(_ValueType2, __decltype(*__first));
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return __uninitialized_copy<__can_memcpy>::
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__uninit_copy(__first, __last, __result);
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#endif
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}
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#pragma GCC diagnostic pop
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/// @cond undocumented
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// This is the default implementation of std::uninitialized_fill.
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template<typename _ForwardIterator, typename _Tp>
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_GLIBCXX20_CONSTEXPR void
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__do_uninit_fill(_ForwardIterator __first, _ForwardIterator __last,
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const _Tp& __x)
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{
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_UninitDestroyGuard<_ForwardIterator> __guard(__first);
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for (; __first != __last; ++__first)
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std::_Construct(std::__addressof(*__first), __x);
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__guard.release();
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}
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#if __cplusplus < 201103L
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// Use template specialization for C++98 when 'if constexpr' can't be used.
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template<bool _CanMemset>
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struct __uninitialized_fill
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{
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template<typename _ForwardIterator, typename _Tp>
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static void
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__uninit_fill(_ForwardIterator __first, _ForwardIterator __last,
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const _Tp& __x)
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{ std::__do_uninit_fill(__first, __last, __x); }
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};
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template<>
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struct __uninitialized_fill<true>
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{
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// Overload for generic iterators.
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template<typename _ForwardIterator, typename _Tp>
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static void
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__uninit_fill(_ForwardIterator __first, _ForwardIterator __last,
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const _Tp& __x)
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{
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if (__unwrappable_niter<_ForwardIterator>::__value)
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__uninit_fill(std::__niter_base(__first),
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std::__niter_base(__last),
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__x);
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else
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std::__do_uninit_fill(__first, __last, __x);
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}
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// Overload for pointers.
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template<typename _Up, typename _Tp>
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static void
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__uninit_fill(_Up* __first, _Up* __last, const _Tp& __x)
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{
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// Ensure that we don't successfully memset in cases that should be
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// ill-formed because is_constructible<_Up, const _Tp&> is false.
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typedef __typeof__(static_cast<_Up>(__x)) __check
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__attribute__((__unused__));
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if (__first != __last)
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__builtin_memset(__first, (unsigned char)__x, __last - __first);
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}
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};
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#endif
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/// @endcond
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/**
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* @brief Copies the value x into the range [first,last).
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* @param __first A forward iterator.
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* @param __last A forward iterator.
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* @param __x The source value.
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* @return Nothing.
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*
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* Like std::fill, but does not require an initialized output range.
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*/
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template<typename _ForwardIterator, typename _Tp>
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_GLIBCXX26_CONSTEXPR
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inline void
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uninitialized_fill(_ForwardIterator __first, _ForwardIterator __last,
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const _Tp& __x)
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{
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// We would like to use memset to optimize this loop when possible.
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// As for std::uninitialized_copy, the optimization requires
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// contiguous iterators and trivially copyable value types,
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// with the additional requirement that sizeof(_Tp) == 1 because
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// memset only writes single bytes.
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// FIXME: We could additionally enable this for 1-byte enums.
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// Maybe any 1-byte Val if is_trivially_constructible<Val, const T&>?
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typedef typename iterator_traits<_ForwardIterator>::value_type
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_ValueType;
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#if __cplusplus >= 201103L
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wc++17-extensions"
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#if __glibcxx_raw_memory_algorithms >= 202411L // >= C++26
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if consteval {
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return std::__do_uninit_fill(__first, __last, __x);
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}
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#endif
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if constexpr (__is_byte<_ValueType>::__value)
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if constexpr (is_same<_ValueType, _Tp>::value
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|| is_integral<_Tp>::value)
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{
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using _BasePtr = decltype(std::__niter_base(__first));
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if constexpr (is_pointer<_BasePtr>::value)
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{
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void* __dest = std::__niter_base(__first);
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ptrdiff_t __n = __last - __first;
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if (__n > 0) [[__likely__]]
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__builtin_memset(__dest, (unsigned char)__x, __n);
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return;
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}
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#if __cpp_lib_concepts
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else if constexpr (contiguous_iterator<_ForwardIterator>)
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{
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auto __dest = std::to_address(__first);
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auto __n = __last - __first;
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if (__n > 0) [[__likely__]]
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__builtin_memset(__dest, (unsigned char)__x, __n);
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return;
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}
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#endif
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}
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std::__do_uninit_fill(__first, __last, __x);
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#pragma GCC diagnostic pop
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#else // C++98
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const bool __can_memset = __is_byte<_ValueType>::__value
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&& __is_integer<_Tp>::__value;
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__uninitialized_fill<__can_memset>::__uninit_fill(__first, __last, __x);
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#endif
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}
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/// @cond undocumented
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// This is the default implementation of std::uninitialized_fill_n.
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template<typename _ForwardIterator, typename _Size, typename _Tp>
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_GLIBCXX20_CONSTEXPR
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_ForwardIterator
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__do_uninit_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)
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{
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_UninitDestroyGuard<_ForwardIterator> __guard(__first);
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#if __cplusplus >= 201103L
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wc++17-extensions"
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if constexpr (is_integral<_Size>::value)
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// Loop will never terminate if __n is negative.
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__glibcxx_assert(__n >= 0);
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else if constexpr (is_floating_point<_Size>::value)
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// Loop will never terminate if __n is not an integer.
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__glibcxx_assert(__n >= 0 && static_cast<size_t>(__n) == __n);
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#pragma GCC diagnostic pop
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#endif
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for (; __n--; ++__first)
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std::_Construct(std::__addressof(*__first), __x);
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__guard.release();
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return __first;
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}
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#if __cplusplus < 201103L
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// Use template specialization for C++98 when 'if constexpr' can't be used.
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template<bool _CanMemset>
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struct __uninitialized_fill_n
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{
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template<typename _ForwardIterator, typename _Size, typename _Tp>
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static _ForwardIterator
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__uninit_fill_n(_ForwardIterator __first, _Size __n,
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const _Tp& __x)
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{ return std::__do_uninit_fill_n(__first, __n, __x); }
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};
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template<>
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struct __uninitialized_fill_n<true>
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{
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// Overload for generic iterators.
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|
template<typename _ForwardIterator, typename _Size, typename _Tp>
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static _ForwardIterator
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|
__uninit_fill_n(_ForwardIterator __first, _Size __n,
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const _Tp& __x)
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|
{
|
|
if (__unwrappable_niter<_ForwardIterator>::__value)
|
|
{
|
|
_ForwardIterator __last = __first;
|
|
std::advance(__last, __n);
|
|
__uninitialized_fill<true>::__uninit_fill(__first, __last, __x);
|
|
return __last;
|
|
}
|
|
else
|
|
return std::__do_uninit_fill_n(__first, __n, __x);
|
|
}
|
|
};
|
|
#endif
|
|
/// @endcond
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wc++17-extensions"
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
|
// DR 1339. uninitialized_fill_n should return the end of its range
|
|
/**
|
|
* @brief Copies the value x into the range [first,first+n).
|
|
* @param __first A forward iterator.
|
|
* @param __n The number of copies to make.
|
|
* @param __x The source value.
|
|
* @return __first + __n.
|
|
*
|
|
* Like std::fill_n, but does not require an initialized output range.
|
|
*/
|
|
template<typename _ForwardIterator, typename _Size, typename _Tp>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)
|
|
{
|
|
// See uninitialized_fill conditions. We also require _Size to be
|
|
// an integer. The standard only requires _Size to be decrementable
|
|
// and contextually convertible to bool, so don't assume first+n works.
|
|
|
|
// FIXME: We could additionally enable this for 1-byte enums.
|
|
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
|
|
#if __cplusplus >= 201103L
|
|
#if __glibcxx_raw_memory_algorithms >= 202411L // >= C++26
|
|
if consteval {
|
|
return std::__do_uninit_fill_n(__first, __n, __x);
|
|
}
|
|
#endif
|
|
if constexpr (__is_byte<_ValueType>::__value)
|
|
if constexpr (is_integral<_Tp>::value)
|
|
if constexpr (is_integral<_Size>::value)
|
|
{
|
|
using _BasePtr = decltype(std::__niter_base(__first));
|
|
if constexpr (is_pointer<_BasePtr>::value)
|
|
{
|
|
void* __dest = std::__niter_base(__first);
|
|
if (__n > 0) [[__likely__]]
|
|
{
|
|
__builtin_memset(__dest, (unsigned char)__x, __n);
|
|
__first += __n;
|
|
}
|
|
return __first;
|
|
}
|
|
#if __cpp_lib_concepts
|
|
else if constexpr (contiguous_iterator<_ForwardIterator>)
|
|
{
|
|
auto __dest = std::to_address(__first);
|
|
if (__n > 0) [[__likely__]]
|
|
{
|
|
__builtin_memset(__dest, (unsigned char)__x, __n);
|
|
__first += __n;
|
|
}
|
|
return __first;
|
|
}
|
|
#endif
|
|
}
|
|
return std::__do_uninit_fill_n(__first, __n, __x);
|
|
#else // C++98
|
|
const bool __can_memset = __is_byte<_ValueType>::__value
|
|
&& __is_integer<_Tp>::__value
|
|
&& __is_integer<_Size>::__value;
|
|
|
|
return __uninitialized_fill_n<__can_memset>::
|
|
__uninit_fill_n(__first, __n, __x);
|
|
#endif
|
|
}
|
|
#pragma GCC diagnostic pop
|
|
|
|
/// @cond undocumented
|
|
|
|
// Extensions: versions of uninitialized_copy, uninitialized_fill,
|
|
// and uninitialized_fill_n that take an allocator parameter.
|
|
// We dispatch back to the standard versions when we're given the
|
|
// default allocator. For nondefault allocators we do not use
|
|
// any of the POD optimizations.
|
|
|
|
template<typename _InputIterator, typename _Sentinel,
|
|
typename _ForwardIterator, typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
_ForwardIterator
|
|
__uninitialized_copy_a(_InputIterator __first, _Sentinel __last,
|
|
_ForwardIterator __result, _Allocator& __alloc)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator>
|
|
__guard(__result, __alloc);
|
|
|
|
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
|
|
for (; __first != __last; ++__first, (void)++__result)
|
|
__traits::construct(__alloc, std::__addressof(*__result), *__first);
|
|
__guard.release();
|
|
return __result;
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
template<typename _InputIterator, typename _Sentinel,
|
|
typename _ForwardIterator, typename _Tp>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_copy_a(_InputIterator __first, _Sentinel __last,
|
|
_ForwardIterator __result, allocator<_Tp>&)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
return std::__do_uninit_copy(std::move(__first), __last, __result);
|
|
#endif
|
|
|
|
#ifdef __glibcxx_ranges
|
|
if constexpr (!is_same_v<_InputIterator, _Sentinel>)
|
|
{
|
|
// Convert to a common range if possible, to benefit from memcpy
|
|
// optimizations that std::uninitialized_copy might use.
|
|
if constexpr (sized_sentinel_for<_Sentinel, _InputIterator>
|
|
&& random_access_iterator<_InputIterator>)
|
|
return std::uninitialized_copy(__first,
|
|
__first + (__last - __first),
|
|
__result);
|
|
else // Just use default implementation.
|
|
return std::__do_uninit_copy(std::move(__first), __last, __result);
|
|
}
|
|
else
|
|
return std::uninitialized_copy(std::move(__first), __last, __result);
|
|
#else
|
|
return std::uninitialized_copy(__first, __last, __result);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
template<typename _InputIterator, typename _ForwardIterator,
|
|
typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_move_a(_InputIterator __first, _InputIterator __last,
|
|
_ForwardIterator __result, _Allocator& __alloc)
|
|
{
|
|
return std::__uninitialized_copy_a(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
|
|
_GLIBCXX_MAKE_MOVE_ITERATOR(__last),
|
|
__result, __alloc);
|
|
}
|
|
|
|
template<typename _InputIterator, typename _ForwardIterator,
|
|
typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_move_if_noexcept_a(_InputIterator __first,
|
|
_InputIterator __last,
|
|
_ForwardIterator __result,
|
|
_Allocator& __alloc)
|
|
{
|
|
return std::__uninitialized_copy_a
|
|
(_GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(__first),
|
|
_GLIBCXX_MAKE_MOVE_IF_NOEXCEPT_ITERATOR(__last), __result, __alloc);
|
|
}
|
|
|
|
template<typename _ForwardIterator, typename _Tp, typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
void
|
|
__uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
|
|
const _Tp& __x, _Allocator& __alloc)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator>
|
|
__guard(__first, __alloc);
|
|
|
|
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
|
|
for (; __first != __last; ++__first)
|
|
__traits::construct(__alloc, std::__addressof(*__first), __x);
|
|
|
|
__guard.release();
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
template<typename _ForwardIterator, typename _Tp, typename _Tp2>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
__uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
|
|
const _Tp& __x, allocator<_Tp2>&)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
return std::__do_uninit_fill(__first, __last, __x);
|
|
#endif
|
|
std::uninitialized_fill(__first, __last, __x);
|
|
}
|
|
#endif
|
|
|
|
template<typename _ForwardIterator, typename _Size, typename _Tp,
|
|
typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
_ForwardIterator
|
|
__uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
|
|
const _Tp& __x, _Allocator& __alloc)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator>
|
|
__guard(__first, __alloc);
|
|
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
|
|
for (; __n > 0; --__n, (void) ++__first)
|
|
__traits::construct(__alloc, std::__addressof(*__first), __x);
|
|
__guard.release();
|
|
return __first;
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
template<typename _ForwardIterator, typename _Size, typename _Tp,
|
|
typename _Tp2>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
|
|
const _Tp& __x, allocator<_Tp2>&)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
return std::__do_uninit_fill_n(__first, __n, __x);
|
|
#endif
|
|
return std::uninitialized_fill_n(__first, __n, __x);
|
|
}
|
|
#endif
|
|
|
|
// Extensions: __uninitialized_copy_move, __uninitialized_move_copy,
|
|
// __uninitialized_fill_move, __uninitialized_move_fill.
|
|
// All of these algorithms take a user-supplied allocator, which is used
|
|
// for construction and destruction.
|
|
|
|
// __uninitialized_copy_move
|
|
// Copies [first1, last1) into [result, result + (last1 - first1)), and
|
|
// move [first2, last2) into
|
|
// [result, result + (last1 - first1) + (last2 - first2)).
|
|
template<typename _InputIterator1, typename _InputIterator2,
|
|
typename _ForwardIterator, typename _Allocator>
|
|
inline _ForwardIterator
|
|
__uninitialized_copy_move(_InputIterator1 __first1,
|
|
_InputIterator1 __last1,
|
|
_InputIterator2 __first2,
|
|
_InputIterator2 __last2,
|
|
_ForwardIterator __result,
|
|
_Allocator& __alloc)
|
|
{
|
|
_ForwardIterator __mid = std::__uninitialized_copy_a(__first1, __last1,
|
|
__result, __alloc);
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__result,
|
|
__alloc);
|
|
__result = __mid; // Everything up to __mid is now guarded.
|
|
__result = std::__uninitialized_move_a(__first2, __last2, __mid, __alloc);
|
|
__guard.release();
|
|
return __result;
|
|
}
|
|
|
|
// __uninitialized_move_copy
|
|
// Moves [first1, last1) into [result, result + (last1 - first1)), and
|
|
// copies [first2, last2) into
|
|
// [result, result + (last1 - first1) + (last2 - first2)).
|
|
template<typename _InputIterator1, typename _InputIterator2,
|
|
typename _ForwardIterator, typename _Allocator>
|
|
inline _ForwardIterator
|
|
__uninitialized_move_copy(_InputIterator1 __first1,
|
|
_InputIterator1 __last1,
|
|
_InputIterator2 __first2,
|
|
_InputIterator2 __last2,
|
|
_ForwardIterator __result,
|
|
_Allocator& __alloc)
|
|
{
|
|
_ForwardIterator __mid = std::__uninitialized_move_a(__first1, __last1,
|
|
__result, __alloc);
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__result,
|
|
__alloc);
|
|
__result = __mid; // Everything up to __mid is now guarded.
|
|
__result = std::__uninitialized_copy_a(__first2, __last2, __mid, __alloc);
|
|
__guard.release();
|
|
return __result;
|
|
}
|
|
|
|
// __uninitialized_fill_move
|
|
// Fills [result, mid) with x, and moves [first, last) into
|
|
// [mid, mid + (last - first)).
|
|
template<typename _ForwardIterator, typename _Tp, typename _InputIterator,
|
|
typename _Allocator>
|
|
inline _ForwardIterator
|
|
__uninitialized_fill_move(_ForwardIterator __result, _ForwardIterator __mid,
|
|
const _Tp& __x, _InputIterator __first,
|
|
_InputIterator __last, _Allocator& __alloc)
|
|
{
|
|
std::__uninitialized_fill_a(__result, __mid, __x, __alloc);
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__result,
|
|
__alloc);
|
|
__result = __mid; // Everything up to __mid is now guarded.
|
|
__result = std::__uninitialized_move_a(__first, __last, __mid, __alloc);
|
|
__guard.release();
|
|
return __result;
|
|
}
|
|
|
|
// __uninitialized_move_fill
|
|
// Moves [first1, last1) into [first2, first2 + (last1 - first1)), and
|
|
// fills [first2 + (last1 - first1), last2) with x.
|
|
template<typename _InputIterator, typename _ForwardIterator, typename _Tp,
|
|
typename _Allocator>
|
|
inline void
|
|
__uninitialized_move_fill(_InputIterator __first1, _InputIterator __last1,
|
|
_ForwardIterator __first2,
|
|
_ForwardIterator __last2, const _Tp& __x,
|
|
_Allocator& __alloc)
|
|
{
|
|
_ForwardIterator __mid2 = std::__uninitialized_move_a(__first1, __last1,
|
|
__first2,
|
|
__alloc);
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__first2,
|
|
__alloc);
|
|
__first2 = __mid2; // Everything up to __mid2 is now guarded.
|
|
std::__uninitialized_fill_a(__mid2, __last2, __x, __alloc);
|
|
__guard.release();
|
|
}
|
|
|
|
/// @endcond
|
|
|
|
#if __cplusplus >= 201103L
|
|
/// @cond undocumented
|
|
|
|
// Extensions: __uninitialized_default, __uninitialized_default_n,
|
|
// __uninitialized_default_a, __uninitialized_default_n_a.
|
|
|
|
template<bool _TrivialValueType>
|
|
struct __uninitialized_default_1
|
|
{
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static void
|
|
__uninit_default(_ForwardIterator __first, _ForwardIterator __last)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__first);
|
|
for (; __first != __last; ++__first)
|
|
std::_Construct(std::__addressof(*__first));
|
|
__guard.release();
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct __uninitialized_default_1<true>
|
|
{
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static void
|
|
__uninit_default(_ForwardIterator __first, _ForwardIterator __last)
|
|
{
|
|
if (__first == __last)
|
|
return;
|
|
|
|
typename iterator_traits<_ForwardIterator>::value_type* __val
|
|
= std::__addressof(*__first);
|
|
std::_Construct(__val);
|
|
if (++__first != __last)
|
|
std::fill(__first, __last, *__val);
|
|
}
|
|
};
|
|
|
|
template<bool _TrivialValueType>
|
|
struct __uninitialized_default_n_1
|
|
{
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX20_CONSTEXPR
|
|
static _ForwardIterator
|
|
__uninit_default_n(_ForwardIterator __first, _Size __n)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__first);
|
|
for (; __n > 0; --__n, (void) ++__first)
|
|
std::_Construct(std::__addressof(*__first));
|
|
__guard.release();
|
|
return __first;
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct __uninitialized_default_n_1<true>
|
|
{
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX20_CONSTEXPR
|
|
static _ForwardIterator
|
|
__uninit_default_n(_ForwardIterator __first, _Size __n)
|
|
{
|
|
if (__n > 0)
|
|
{
|
|
typename iterator_traits<_ForwardIterator>::value_type* __val
|
|
= std::__addressof(*__first);
|
|
std::_Construct(__val);
|
|
++__first;
|
|
__first = std::fill_n(__first, __n - 1, *__val);
|
|
}
|
|
return __first;
|
|
}
|
|
};
|
|
|
|
// __uninitialized_default
|
|
// Fills [first, last) with value-initialized value_types.
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
__uninitialized_default(_ForwardIterator __first,
|
|
_ForwardIterator __last)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
return __uninitialized_default_1<false>::
|
|
__uninit_default(__first, __last);
|
|
#endif
|
|
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
// trivial types can have deleted assignment
|
|
const bool __assignable = is_copy_assignable<_ValueType>::value;
|
|
|
|
std::__uninitialized_default_1<__is_trivial(_ValueType)
|
|
&& __assignable>::
|
|
__uninit_default(__first, __last);
|
|
}
|
|
|
|
// __uninitialized_default_n
|
|
// Fills [first, first + n) with value-initialized value_types.
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_default_n(_ForwardIterator __first, _Size __n)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
return __uninitialized_default_n_1<false>::
|
|
__uninit_default_n(__first, __n);
|
|
#endif
|
|
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
// See uninitialized_fill_n for the conditions for using std::fill_n.
|
|
constexpr bool __can_fill
|
|
= __and_<is_integral<_Size>, is_copy_assignable<_ValueType>>::value;
|
|
|
|
return __uninitialized_default_n_1<__is_trivial(_ValueType)
|
|
&& __can_fill>::
|
|
__uninit_default_n(__first, __n);
|
|
}
|
|
|
|
|
|
// __uninitialized_default_a
|
|
// Fills [first, last) with value_types constructed by the allocator
|
|
// alloc, with no arguments passed to the construct call.
|
|
template<typename _ForwardIterator, typename _Allocator>
|
|
void
|
|
__uninitialized_default_a(_ForwardIterator __first,
|
|
_ForwardIterator __last,
|
|
_Allocator& __alloc)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__first,
|
|
__alloc);
|
|
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
|
|
for (; __first != __last; ++__first)
|
|
__traits::construct(__alloc, std::__addressof(*__first));
|
|
__guard.release();
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
template<typename _ForwardIterator, typename _Tp>
|
|
inline void
|
|
__uninitialized_default_a(_ForwardIterator __first,
|
|
_ForwardIterator __last,
|
|
allocator<_Tp>&)
|
|
{ std::__uninitialized_default(__first, __last); }
|
|
#endif
|
|
|
|
// __uninitialized_default_n_a
|
|
// Fills [first, first + n) with value_types constructed by the allocator
|
|
// alloc, with no arguments passed to the construct call.
|
|
template<typename _ForwardIterator, typename _Size, typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR _ForwardIterator
|
|
__uninitialized_default_n_a(_ForwardIterator __first, _Size __n,
|
|
_Allocator& __alloc)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator, _Allocator> __guard(__first,
|
|
__alloc);
|
|
typedef __gnu_cxx::__alloc_traits<_Allocator> __traits;
|
|
for (; __n > 0; --__n, (void) ++__first)
|
|
__traits::construct(__alloc, std::__addressof(*__first));
|
|
__guard.release();
|
|
return __first;
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
// __uninitialized_default_n_a specialization for std::allocator,
|
|
// which ignores the allocator and value-initializes the elements.
|
|
template<typename _ForwardIterator, typename _Size, typename _Tp>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_default_n_a(_ForwardIterator __first, _Size __n,
|
|
allocator<_Tp>&)
|
|
{ return std::__uninitialized_default_n(__first, __n); }
|
|
#endif
|
|
|
|
template<bool _TrivialValueType>
|
|
struct __uninitialized_default_novalue_1
|
|
{
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static void
|
|
__uninit_default_novalue(_ForwardIterator __first,
|
|
_ForwardIterator __last)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__first);
|
|
for (; __first != __last; ++__first)
|
|
std::_Construct_novalue(std::__addressof(*__first));
|
|
__guard.release();
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct __uninitialized_default_novalue_1<true>
|
|
{
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static void
|
|
__uninit_default_novalue(_ForwardIterator, _ForwardIterator)
|
|
{
|
|
}
|
|
};
|
|
|
|
template<bool _TrivialValueType>
|
|
struct __uninitialized_default_novalue_n_1
|
|
{
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static _ForwardIterator
|
|
__uninit_default_novalue_n(_ForwardIterator __first, _Size __n)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__first);
|
|
for (; __n > 0; --__n, (void) ++__first)
|
|
std::_Construct_novalue(std::__addressof(*__first));
|
|
__guard.release();
|
|
return __first;
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct __uninitialized_default_novalue_n_1<true>
|
|
{
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX26_CONSTEXPR
|
|
static _ForwardIterator
|
|
__uninit_default_novalue_n(_ForwardIterator __first, _Size __n)
|
|
{ return std::next(__first, __n); }
|
|
};
|
|
|
|
// __uninitialized_default_novalue
|
|
// Fills [first, last) with default-initialized value_types.
|
|
template<typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline void
|
|
__uninitialized_default_novalue(_ForwardIterator __first,
|
|
_ForwardIterator __last)
|
|
{
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
|
|
std::__uninitialized_default_novalue_1<
|
|
is_trivially_default_constructible<_ValueType>::value>::
|
|
__uninit_default_novalue(__first, __last);
|
|
}
|
|
|
|
// __uninitialized_default_novalue_n
|
|
// Fills [first, first + n) with default-initialized value_types.
|
|
template<typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_default_novalue_n(_ForwardIterator __first, _Size __n)
|
|
{
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType;
|
|
|
|
return __uninitialized_default_novalue_n_1<
|
|
is_trivially_default_constructible<_ValueType>::value>::
|
|
__uninit_default_novalue_n(__first, __n);
|
|
}
|
|
|
|
template<typename _InputIterator, typename _Size,
|
|
typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
_ForwardIterator
|
|
__uninitialized_copy_n(_InputIterator __first, _Size __n,
|
|
_ForwardIterator __result, input_iterator_tag)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__result);
|
|
for (; __n > 0; --__n, (void) ++__first, ++__result)
|
|
std::_Construct(std::__addressof(*__result), *__first);
|
|
__guard.release();
|
|
return __result;
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Size,
|
|
typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__uninitialized_copy_n(_RandomAccessIterator __first, _Size __n,
|
|
_ForwardIterator __result,
|
|
random_access_iterator_tag)
|
|
{ return std::uninitialized_copy(__first, __first + __n, __result); }
|
|
|
|
template<typename _InputIterator, typename _Size,
|
|
typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
pair<_InputIterator, _ForwardIterator>
|
|
__uninitialized_copy_n_pair(_InputIterator __first, _Size __n,
|
|
_ForwardIterator __result, input_iterator_tag)
|
|
{
|
|
_UninitDestroyGuard<_ForwardIterator> __guard(__result);
|
|
for (; __n > 0; --__n, (void) ++__first, ++__result)
|
|
std::_Construct(std::__addressof(*__result), *__first);
|
|
__guard.release();
|
|
return {__first, __result};
|
|
}
|
|
|
|
template<typename _RandomAccessIterator, typename _Size,
|
|
typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline pair<_RandomAccessIterator, _ForwardIterator>
|
|
__uninitialized_copy_n_pair(_RandomAccessIterator __first, _Size __n,
|
|
_ForwardIterator __result,
|
|
random_access_iterator_tag)
|
|
{
|
|
auto __second_res = uninitialized_copy(__first, __first + __n, __result);
|
|
auto __first_res = std::next(__first, __n);
|
|
return {__first_res, __second_res};
|
|
}
|
|
|
|
/// @endcond
|
|
|
|
/**
|
|
* @brief Copies the range [first,first+n) into result.
|
|
* @param __first An input iterator.
|
|
* @param __n The number of elements to copy.
|
|
* @param __result An output iterator.
|
|
* @return __result + __n
|
|
* @since C++11
|
|
*
|
|
* Like copy_n(), but does not require an initialized output range.
|
|
*/
|
|
template<typename _InputIterator, typename _Size, typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
uninitialized_copy_n(_InputIterator __first, _Size __n,
|
|
_ForwardIterator __result)
|
|
{ return std::__uninitialized_copy_n(__first, __n, __result,
|
|
std::__iterator_category(__first)); }
|
|
|
|
/// @cond undocumented
|
|
template<typename _InputIterator, typename _Size, typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline pair<_InputIterator, _ForwardIterator>
|
|
__uninitialized_copy_n_pair(_InputIterator __first, _Size __n,
|
|
_ForwardIterator __result)
|
|
{
|
|
return
|
|
std::__uninitialized_copy_n_pair(__first, __n, __result,
|
|
std::__iterator_category(__first));
|
|
}
|
|
/// @endcond
|
|
#endif
|
|
|
|
#ifdef __glibcxx_raw_memory_algorithms // C++ >= 17
|
|
/**
|
|
* @brief Default-initializes objects in the range [first,last).
|
|
* @param __first A forward iterator.
|
|
* @param __last A forward iterator.
|
|
* @since C++17
|
|
*/
|
|
template <typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline void
|
|
uninitialized_default_construct(_ForwardIterator __first,
|
|
_ForwardIterator __last)
|
|
{
|
|
std::__uninitialized_default_novalue(__first, __last);
|
|
}
|
|
|
|
/**
|
|
* @brief Default-initializes objects in the range [first,first+count).
|
|
* @param __first A forward iterator.
|
|
* @param __count The number of objects to construct.
|
|
* @return __first + __count
|
|
* @since C++17
|
|
*/
|
|
template <typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
uninitialized_default_construct_n(_ForwardIterator __first, _Size __count)
|
|
{
|
|
return std::__uninitialized_default_novalue_n(__first, __count);
|
|
}
|
|
|
|
/**
|
|
* @brief Value-initializes objects in the range [first,last).
|
|
* @param __first A forward iterator.
|
|
* @param __last A forward iterator.
|
|
* @since C++17
|
|
*/
|
|
template <typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline void
|
|
uninitialized_value_construct(_ForwardIterator __first,
|
|
_ForwardIterator __last)
|
|
{
|
|
return std::__uninitialized_default(__first, __last);
|
|
}
|
|
|
|
/**
|
|
* @brief Value-initializes objects in the range [first,first+count).
|
|
* @param __first A forward iterator.
|
|
* @param __count The number of objects to construct.
|
|
* @return __result + __count
|
|
* @since C++17
|
|
*/
|
|
template <typename _ForwardIterator, typename _Size>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
uninitialized_value_construct_n(_ForwardIterator __first, _Size __count)
|
|
{
|
|
return std::__uninitialized_default_n(__first, __count);
|
|
}
|
|
|
|
/**
|
|
* @brief Move-construct from the range [first,last) into result.
|
|
* @param __first An input iterator.
|
|
* @param __last An input iterator.
|
|
* @param __result An output iterator.
|
|
* @return __result + (__first - __last)
|
|
* @since C++17
|
|
*/
|
|
template <typename _InputIterator, typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline _ForwardIterator
|
|
uninitialized_move(_InputIterator __first, _InputIterator __last,
|
|
_ForwardIterator __result)
|
|
{
|
|
return std::uninitialized_copy
|
|
(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
|
|
_GLIBCXX_MAKE_MOVE_ITERATOR(__last), __result);
|
|
}
|
|
|
|
/**
|
|
* @brief Move-construct from the range [first,first+count) into result.
|
|
* @param __first An input iterator.
|
|
* @param __count The number of objects to initialize.
|
|
* @param __result An output iterator.
|
|
* @return __result + __count
|
|
* @since C++17
|
|
*/
|
|
template <typename _InputIterator, typename _Size, typename _ForwardIterator>
|
|
_GLIBCXX26_CONSTEXPR
|
|
inline pair<_InputIterator, _ForwardIterator>
|
|
uninitialized_move_n(_InputIterator __first, _Size __count,
|
|
_ForwardIterator __result)
|
|
{
|
|
auto __res = std::__uninitialized_copy_n_pair
|
|
(_GLIBCXX_MAKE_MOVE_ITERATOR(__first),
|
|
__count, __result);
|
|
return {__res.first.base(), __res.second};
|
|
}
|
|
#endif // __glibcxx_raw_memory_algorithms
|
|
|
|
#if __cplusplus >= 201103L
|
|
/// @cond undocumented
|
|
|
|
template<typename _Tp, typename _Up, typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline void
|
|
__relocate_object_a(_Tp* __restrict __dest, _Up* __restrict __orig,
|
|
_Allocator& __alloc)
|
|
noexcept(noexcept(std::allocator_traits<_Allocator>::construct(__alloc,
|
|
__dest, std::move(*__orig)))
|
|
&& noexcept(std::allocator_traits<_Allocator>::destroy(
|
|
__alloc, std::__addressof(*__orig))))
|
|
{
|
|
typedef std::allocator_traits<_Allocator> __traits;
|
|
__traits::construct(__alloc, __dest, std::move(*__orig));
|
|
__traits::destroy(__alloc, std::__addressof(*__orig));
|
|
}
|
|
|
|
// This class may be specialized for specific types.
|
|
// Also known as is_trivially_relocatable.
|
|
template<typename _Tp, typename = void>
|
|
struct __is_bitwise_relocatable
|
|
: __bool_constant<__is_trivial(_Tp)>
|
|
{ };
|
|
|
|
template <typename _InputIterator, typename _ForwardIterator,
|
|
typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__relocate_a_1(_InputIterator __first, _InputIterator __last,
|
|
_ForwardIterator __result, _Allocator& __alloc)
|
|
noexcept(noexcept(std::__relocate_object_a(std::addressof(*__result),
|
|
std::addressof(*__first),
|
|
__alloc)))
|
|
{
|
|
typedef typename iterator_traits<_InputIterator>::value_type
|
|
_ValueType;
|
|
typedef typename iterator_traits<_ForwardIterator>::value_type
|
|
_ValueType2;
|
|
static_assert(std::is_same<_ValueType, _ValueType2>::value,
|
|
"relocation is only possible for values of the same type");
|
|
_ForwardIterator __cur = __result;
|
|
for (; __first != __last; ++__first, (void)++__cur)
|
|
std::__relocate_object_a(std::__addressof(*__cur),
|
|
std::__addressof(*__first), __alloc);
|
|
return __cur;
|
|
}
|
|
|
|
#if _GLIBCXX_HOSTED
|
|
template <typename _Tp, typename _Up>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline __enable_if_t<std::__is_bitwise_relocatable<_Tp>::value, _Tp*>
|
|
__relocate_a_1(_Tp* __first, _Tp* __last,
|
|
_Tp* __result,
|
|
[[__maybe_unused__]] allocator<_Up>& __alloc) noexcept
|
|
{
|
|
ptrdiff_t __count = __last - __first;
|
|
if (__count > 0)
|
|
{
|
|
#ifdef __cpp_lib_is_constant_evaluated
|
|
if (std::is_constant_evaluated())
|
|
{
|
|
// Can't use memcpy. Wrap the pointer so that __relocate_a_1
|
|
// resolves to the non-trivial overload above.
|
|
__gnu_cxx::__normal_iterator<_Tp*, void> __out(__result);
|
|
__out = std::__relocate_a_1(__first, __last, __out, __alloc);
|
|
return __out.base();
|
|
}
|
|
#endif
|
|
__builtin_memcpy(__result, __first, __count * sizeof(_Tp));
|
|
}
|
|
return __result + __count;
|
|
}
|
|
#endif
|
|
|
|
template <typename _InputIterator, typename _ForwardIterator,
|
|
typename _Allocator>
|
|
_GLIBCXX20_CONSTEXPR
|
|
inline _ForwardIterator
|
|
__relocate_a(_InputIterator __first, _InputIterator __last,
|
|
_ForwardIterator __result, _Allocator& __alloc)
|
|
noexcept(noexcept(__relocate_a_1(std::__niter_base(__first),
|
|
std::__niter_base(__last),
|
|
std::__niter_base(__result), __alloc)))
|
|
{
|
|
return std::__relocate_a_1(std::__niter_base(__first),
|
|
std::__niter_base(__last),
|
|
std::__niter_base(__result), __alloc);
|
|
}
|
|
|
|
/// @endcond
|
|
#endif // C++11
|
|
|
|
/// @} group memory
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace
|
|
|
|
#endif /* _STL_UNINITIALIZED_H */
|