libstdc++: unordered_map Source File

libstdc++

experimental/unordered_map
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1// <experimental/unordered_map> -*- C++ -*-
2
3// Copyright (C) 2015-2026 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 experimental/unordered_map
26 * This is a TS C++ Library header.
27 * @ingroup libfund-ts
28 */
29
30#ifndef _GLIBCXX_EXPERIMENTAL_UNORDERED_MAP
31#define _GLIBCXX_EXPERIMENTAL_UNORDERED_MAP 1
32
33#ifdef _GLIBCXX_SYSHDR
34#pragma GCC system_header
35#endif
36
37#include <bits/requires_hosted.h> // experimental is currently omitted
38
39#if __cplusplus >= 201402L
40
41#include <unordered_map>
42#include <bits/erase_if.h>
43#include <experimental/memory_resource>
44
45namespace std _GLIBCXX_VISIBILITY(default)
46{
47_GLIBCXX_BEGIN_NAMESPACE_VERSION
48
49namespace experimental
50{
51inline namespace fundamentals_v2
52{
53 template<typename _Key, typename _Tp, typename _Hash, typename _CPred,
54 typename _Alloc, typename _Predicate>
55 inline void
56 erase_if(unordered_map<_Key, _Tp, _Hash, _CPred, _Alloc>& __cont,
57 _Predicate __pred)
58 {
59 _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _CPred, _Alloc>&
60 __ucont = __cont;
61 std::__detail::__erase_nodes_if(__cont, __ucont, __pred);
62 }
63
64 template<typename _Key, typename _Tp, typename _Hash, typename _CPred,
65 typename _Alloc, typename _Predicate>
66 inline void
67 erase_if(unordered_multimap<_Key, _Tp, _Hash, _CPred, _Alloc>& __cont,
68 _Predicate __pred)
69 {
70 _GLIBCXX_STD_C::unordered_multimap<_Key, _Tp, _Hash, _CPred, _Alloc>&
71 __ucont = __cont;
72 std::__detail::__erase_nodes_if(__cont, __ucont, __pred);
73 }
74
75 namespace pmr {
76 template<typename _Key, typename _Tp, typename _Hash = hash<_Key>,
77 typename _Pred = equal_to<_Key>>
78 using unordered_map
79 = std::unordered_map<_Key, _Tp, _Hash, _Pred,
80 polymorphic_allocator<pair<const _Key, _Tp>>>;
81
82 template<typename _Key, typename _Tp, typename _Hash = hash<_Key>,
83 typename _Pred = equal_to<_Key>>
84 using unordered_multimap
85 = std::unordered_multimap<_Key, _Tp, _Hash, _Pred,
86 polymorphic_allocator<pair<const _Key, _Tp>>>;
87 } // namespace pmr
88
89} // namespace fundamentals_v2
90} // namespace experimental
91
92_GLIBCXX_END_NAMESPACE_VERSION
93} // namespace std
94
95#endif // C++14
96
97#endif // _GLIBCXX_EXPERIMENTAL_UNORDERED_MAP
erase_if.h
requires_hosted.h
std
ISO C++ entities toplevel namespace is std.
std::experimental
Namespace for features defined in ISO Technical Specifications.
memory_resource
unordered_map