libstdc++: new_allocator.h Source File

libstdc++

ext/new_allocator.h
Go to the documentation of this file.
1// Allocator that wraps operator new -*- C++ -*-
2
3// Copyright (C) 2001-2026 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
36namespace __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
requires_hosted.h
__gnu_cxx
GNU extensions for public use.
std::__new_allocator
An allocator that uses global new, as per C++03 [20.4.1].
Definition bits/new_allocator.h:64
__gnu_cxx::other
new_allocator.h