1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11
10
11// <map>
12
13// class multimap
14
15// template<typename K>
16// pair<iterator,iterator> equal_range(const K& x); // C++14
17// template<typename K>
18// pair<const_iterator,const_iterator> equal_range(const K& x) const;
19// // C++14
20
21#include <cassert>
22#include <map>
23#include <utility>
24
25struct Comp {
26 using is_transparent = void;
27
28 bool operator()(const std::pair<int, int> &lhs,
29 const std::pair<int, int> &rhs) const {
30 return lhs < rhs;
31 }
32
33 bool operator()(const std::pair<int, int> &lhs, int rhs) const {
34 return lhs.first < rhs;
35 }
36
37 bool operator()(int lhs, const std::pair<int, int> &rhs) const {
38 return lhs < rhs.first;
39 }
40};
41
42int main(int, char**) {
43 std::multimap<std::pair<int, int>, int, Comp> s{
44 {{2, 1}, 1}, {{1, 1}, 2}, {{1, 1}, 3}, {{1, 1}, 4}, {{2, 2}, 5}};
45
46 auto er = s.equal_range(x: 1);
47 long nels = 0;
48
49 for (auto it = er.first; it != er.second; it++) {
50 assert(it->first.first == 1);
51 nels++;
52 }
53
54 assert(nels == 3);
55
56 return 0;
57}
58

source code of libcxx/test/std/containers/associative/multimap/multimap.ops/equal_range_transparent.pass.cpp