libstdc++-v3/include/ext/new_allocator.h

   1 // Allocator that wraps operator new -*- C++ -*-
   2
   3 // Copyright (C) 2001-2022 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file ext/new_allocator.h
  26  *  This file is a GNU extension to the Standard C++ Library.
  27  */
  28
  29 #ifndef _NEW_ALLOCATOR_H
  30 #define _NEW_ALLOCATOR_H 1
  31
  32 #include <bits/requires_hosted.h> // GNU extensions are currently omitted
  33
  34 #include <bits/new_allocator.h>
  35
  36 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  37 {
  38 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  39
  40   /**
  41    *  @brief  An allocator that uses global `new`, as per C++03 [20.4.1].
  42    *  @ingroup allocators
  43    *
  44    *  This is precisely the allocator defined in the C++ Standard.
  45    *    - all allocation calls `operator new`
  46    *    - all deallocation calls `operator delete`
  47    *
  48    *  This is a non-standard extension that can be used to guarantee
  49    *  allocation from `new` even if the library has been configured to
  50    *  use a different implementation for `std::allocator`.
  51    *
  52    *  @tparam  _Tp  Type of allocated object.
  53    *
  54    *  @headerfile ext/new_allocator.h
  55    */
  56   template<typename _Tp>
  57     class new_allocator : public std::__new_allocator<_Tp>
  58     {
  59     public:
  60 #if __cplusplus <= 201703L
  61       template<typename _Tp1>
  62         struct rebind
  63         { typedef new_allocator<_Tp1> other; };
  64 #endif
  65
  66       new_allocator() _GLIBCXX_USE_NOEXCEPT { }
  67
  68       new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
  69
  70       template<typename _Tp1>
  71         new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
  72     };
  73
  74 _GLIBCXX_END_NAMESPACE_VERSION
  75 } // namespace
  76
  77 #endif