libstdc++
ext/new_allocator.h
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1 // Allocator that wraps operator new -*- C++ -*-
2 
3 // Copyright (C) 2001-2024 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
An allocator that uses global new, as per C++03 [20.4.1].This is precisely the allocator defined in t...
GNU extensions for public use.
An allocator that uses global new, as per C++03 [20.4.1].This is precisely the allocator defined in t...