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// size_type count(const K& x) const; // C++14
17
18#include <cassert>
19#include <map>
20#include <utility>
21
22struct Comp {
23 using is_transparent = void;
24
25 bool operator()(const std::pair<int, int> &lhs,
26 const std::pair<int, int> &rhs) const {
27 return lhs < rhs;
28 }
29
30 bool operator()(const std::pair<int, int> &lhs, int rhs) const {
31 return lhs.first < rhs;
32 }
33
34 bool operator()(int lhs, const std::pair<int, int> &rhs) const {
35 return lhs < rhs.first;
36 }
37};
38
39int main(int, char**) {
40 std::multimap<std::pair<int, int>, int, Comp> s{
41 {{2, 1}, 1}, {{1, 1}, 2}, {{1, 1}, 3}, {{1, 1}, 4}, {{2, 2}, 5}};
42
43 auto cnt = s.count(x: 1);
44 assert(cnt == 3);
45
46 return 0;
47}
48

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