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
22 struct Comp {
23 using is_transparent = void;
24
operator ()Comp25 bool operator()(const std::pair<int, int> &lhs,
26 const std::pair<int, int> &rhs) const {
27 return lhs < rhs;
28 }
29
operator ()Comp30 bool operator()(const std::pair<int, int> &lhs, int rhs) const {
31 return lhs.first < rhs;
32 }
33
operator ()Comp34 bool operator()(int lhs, const std::pair<int, int> &rhs) const {
35 return lhs < rhs.first;
36 }
37 };
38
main(int,char **)39 int 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(1);
44 assert(cnt == 3);
45
46 return 0;
47 }
48