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Edit File : new_allocator.h \| Size : 4.69 KB
// Allocator that wraps operator new -- C++ -- // Copyright (C) 2001-2018 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 ext/new_allocator.h * This file is a GNU extension to the Standard C++ Library. / #ifndef _NEW_ALLOCATOR_H #define _NEW_ALLOCATOR_H 1 #include <bits/c++config.h> #include <new> #include <bits/functexcept.h> #include <bits/move.h> #if __cplusplus >= 201103L #include <type_traits> #endif namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION using std::size_t; using std::ptrdiff_t; /* * @brief An allocator that uses global new, as per [20.4]. * @ingroup allocators * * This is precisely the allocator defined in the C++ Standard. * - all allocation calls operator new * - all deallocation calls operator delete * * @tparam _Tp Type of allocated object. / template<typename _Tp> class new_allocator { public: typedef size_t size_type; typedef ptrdiff_t difference_type; typedef _Tp pointer; typedef const _Tp* const_pointer; typedef _Tp& reference; typedef const _Tp& const_reference; typedef _Tp value_type; template<typename _Tp1> struct rebind { typedef new_allocator<_Tp1> other; }; #if __cplusplus >= 201103L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2103. propagate_on_container_move_assignment typedef std::true_type propagate_on_container_move_assignment; #endif new_allocator() _GLIBCXX_USE_NOEXCEPT { } new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { } template<typename _Tp1> new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { } ~new_allocator() _GLIBCXX_USE_NOEXCEPT { } pointer address(reference __x) const _GLIBCXX_NOEXCEPT { return std::__addressof(__x); } const_pointer address(const_reference __x) const _GLIBCXX_NOEXCEPT { return std::__addressof(__x); } // NB: __n is permitted to be 0. The C++ standard says nothing // about what the return value is when __n == 0. pointer allocate(size_type __n, const void* = static_cast<const void>(0)) { if (__n > this->max_size()) std::__throw_bad_alloc(); #if __cpp_aligned_new if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__) { std::align_val_t __al = std::align_val_t(alignof(_Tp)); return static_cast<_Tp>(::operator new(__n * sizeof(_Tp), __al)); } #endif return static_cast<_Tp>(::operator new(__n sizeof(_Tp))); } // __p is not permitted to be a null pointer. void deallocate(pointer __p, size_type) { #if __cpp_aligned_new if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__) { ::operator delete(__p, std::align_val_t(alignof(_Tp))); return; } #endif ::operator delete(__p); } size_type max_size() const _GLIBCXX_USE_NOEXCEPT { return size_t(-1) / sizeof(_Tp); } #if __cplusplus >= 201103L template<typename _Up, typename... _Args> void construct(_Up* __p, _Args&&... __args) { ::new((void )__p) _Up(std::forward<_Args>(__args)...); } template<typename _Up> void destroy(_Up __p) { __p->~_Up(); } #else // _GLIBCXX_RESOLVE_LIB_DEFECTS // 402. wrong new expression in [some_] allocator::construct void construct(pointer __p, const _Tp& __val) { ::new((void *)__p) _Tp(__val); } void destroy(pointer __p) { __p->~_Tp(); } #endif }; template<typename _Tp> inline bool operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) { return true; } template<typename _Tp> inline bool operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) { return false; } _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif Back

Edit File : new_allocator.h | Size : 4.69 KB

// Allocator that wraps operator new -*- C++ -*-

// Copyright (C) 2001-2018 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 ext/new_allocator.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

#ifndef _NEW_ALLOCATOR_H
#define _NEW_ALLOCATOR_H 1

#include <bits/c++config.h>
#include <new>
#include <bits/functexcept.h>
#include <bits/move.h>
#if __cplusplus >= 201103L
#include <type_traits>
#endif

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

using std::size_t;
  using std::ptrdiff_t;

/**
   *  @brief  An allocator that uses global new, as per [20.4].
   *  @ingroup allocators
   *
   *  This is precisely the allocator defined in the C++ Standard.
   *    - all allocation calls operator new
   *    - all deallocation calls operator delete
   *
   *  @tparam  _Tp  Type of allocated object.
   */
  template<typename _Tp>
    class new_allocator
    {
    public:
      typedef size_t     size_type;
      typedef ptrdiff_t  difference_type;
      typedef _Tp*       pointer;
      typedef const _Tp* const_pointer;
      typedef _Tp&       reference;
      typedef const _Tp& const_reference;
      typedef _Tp        value_type;

template<typename _Tp1>
	struct rebind
	{ typedef new_allocator<_Tp1> other; };

#if __cplusplus >= 201103L
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2103. propagate_on_container_move_assignment
      typedef std::true_type propagate_on_container_move_assignment;
#endif

new_allocator() _GLIBCXX_USE_NOEXCEPT { }

new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }

template<typename _Tp1>
	new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }

~new_allocator() _GLIBCXX_USE_NOEXCEPT { }

pointer
      address(reference __x) const _GLIBCXX_NOEXCEPT
      { return std::__addressof(__x); }

const_pointer
      address(const_reference __x) const _GLIBCXX_NOEXCEPT
      { return std::__addressof(__x); }

// NB: __n is permitted to be 0.  The C++ standard says nothing
      // about what the return value is when __n == 0.
      pointer
      allocate(size_type __n, const void* = static_cast<const void*>(0))
      {
	if (__n > this->max_size())
	  std::__throw_bad_alloc();

#if __cpp_aligned_new
	if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
	  {
	    std::align_val_t __al = std::align_val_t(alignof(_Tp));
	    return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp), __al));
	  }
#endif
	return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
      }

// __p is not permitted to be a null pointer.
      void
      deallocate(pointer __p, size_type)
      {
#if __cpp_aligned_new
	if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
	  {
	    ::operator delete(__p, std::align_val_t(alignof(_Tp)));
	    return;
	  }
#endif
	::operator delete(__p);
      }

size_type
      max_size() const _GLIBCXX_USE_NOEXCEPT
      { return size_t(-1) / sizeof(_Tp); }

#if __cplusplus >= 201103L
      template<typename _Up, typename... _Args>
	void
	construct(_Up* __p, _Args&&... __args)
	{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }

template<typename _Up>
	void
	destroy(_Up* __p) { __p->~_Up(); }
#else
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 402. wrong new expression in [some_] allocator::construct
      void
      construct(pointer __p, const _Tp& __val)
      { ::new((void *)__p) _Tp(__val); }

void
      destroy(pointer __p) { __p->~_Tp(); }
#endif
    };

template<typename _Tp>
    inline bool
    operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
    { return true; }

template<typename _Tp>
    inline bool
    operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
    { return false; }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif

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