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// <set>
12
13// class multiset
14
15// template<typename K>
16// size_type count(const K& x) const; // C++14
17
18#include <cassert>
19#include <set>
20#include <utility>
21
22struct Comp {
23 using is_transparent = void;
24
25 bool operator()(const std::pair<int, int>& lhs, const std::pair<int, int>& rhs) const { return lhs < rhs; }
26
27 bool operator()(const std::pair<int, int>& lhs, int rhs) const { return lhs.first < rhs; }
28
29 bool operator()(int lhs, const std::pair<int, int>& rhs) const { return lhs < rhs.first; }
30};
31
32int main(int, char**) {
33 std::multiset<std::pair<int, int>, Comp> s{{2, 1}, {1, 1}, {1, 1}, {1, 1}, {2, 2}};
34
35 auto cnt = s.count(x: 1);
36 assert(cnt == 3);
37
38 return 0;
39}
40

source code of libcxx/test/std/containers/associative/multiset/count_transparent.pass.cpp