libstdc++: unordered_set Source File

libstdc++

unordered_set
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1// <unordered_set> -*- C++ -*-
2
3// Copyright (C) 2007-2026 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 include/unordered_set
26 * This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_UNORDERED_SET
30#define _GLIBCXX_UNORDERED_SET 1
31
32#ifdef _GLIBCXX_SYSHDR
33#pragma GCC system_header
34#endif
35
36#include <bits/requires_hosted.h> // containers
37
38#if __cplusplus < 201103L
39# include <bits/c++0x_warning.h>
40#else
41
42#include <initializer_list>
43#include <bits/unordered_set.h>
44#include <bits/range_access.h>
45#include <bits/erase_if.h>
46
47#ifdef _GLIBCXX_DEBUG
48# include <debug/unordered_set>
49#endif
50
51#define __glibcxx_want_allocator_traits_is_always_equal
52#define __glibcxx_want_containers_ranges
53#define __glibcxx_want_erase_if
54#define __glibcxx_want_generic_unordered_lookup
55#define __glibcxx_want_node_extract
56#define __glibcxx_want_nonmember_container_access
57#define __glibcxx_want_associative_heterogeneous_erasure
58#define __glibcxx_want_associative_heterogeneous_insertion
59#include <bits/version.h>
60
61#if __cplusplus >= 201703L
62#include <bits/memory_resource.h>
63namespace std _GLIBCXX_VISIBILITY(default)
64{
65_GLIBCXX_BEGIN_NAMESPACE_VERSION
66 namespace pmr
67 {
68 template<typename _Key, typename _Hash = std::hash<_Key>,
69 typename _Pred = std::equal_to<_Key>>
70 using unordered_set
71 = std::unordered_set<_Key, _Hash, _Pred,
72 polymorphic_allocator<_Key>>;
73 template<typename _Key, typename _Hash = std::hash<_Key>,
74 typename _Pred = std::equal_to<_Key>>
75 using unordered_multiset
76 = std::unordered_multiset<_Key, _Hash, _Pred,
77 polymorphic_allocator<_Key>>;
78 } // namespace pmr
79_GLIBCXX_END_NAMESPACE_VERSION
80} // namespace std
81#endif // C++17
82
83#ifdef __cpp_lib_erase_if // C++ >= 20 && HOSTED
84namespace std _GLIBCXX_VISIBILITY(default)
85{
86_GLIBCXX_BEGIN_NAMESPACE_VERSION
87 template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
88 typename _Predicate>
89 inline typename _GLIBCXX_STD_C::unordered_set<_Key, _Hash,
90 _CPred, _Alloc>::size_type
91 erase_if(_GLIBCXX_STD_C::unordered_set<_Key, _Hash, _CPred, _Alloc>& __cont,
92 _Predicate __pred)
93 { return __detail::__erase_nodes_if(__cont, __cont, __pred); }
94
95 template<typename _Key, typename _Hash, typename _CPred, typename _Alloc,
96 typename _Predicate>
97 inline typename _GLIBCXX_STD_C::unordered_multiset<_Key, _Hash,
98 _CPred, _Alloc>::size_type
99 erase_if(_GLIBCXX_STD_C::unordered_multiset<_Key, _Hash, _CPred, _Alloc>& __cont,
100 _Predicate __pred)
101 { return __detail::__erase_nodes_if(__cont, __cont, __pred); }
102_GLIBCXX_END_NAMESPACE_VERSION
103} // namespace std
104#endif // __cpp_lib_erase_if
105
106#endif // C++11
107
108#endif // _GLIBCXX_UNORDERED_SET
initializer_list
c++0x_warning.h
range_access.h
version.h
erase_if.h
memory_resource.h
requires_hosted.h
unordered_set.h
std
ISO C++ entities toplevel namespace is std.
std::pmr::polymorphic_allocator
Class template polymorphic_allocator.
Definition memory_resource.h:123
unordered_set