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 | |
22 | struct 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 | |
39 | int main(int, char**) { |
40 | std::multiset<std::pair<int, int>, Comp> s{{2, 1}, {1, 1}, {1, 1}, {1, 1}, {2, 2}}; |
41 | |
42 | auto cnt = s.count(x: 1); |
43 | assert(cnt == 3); |
44 | |
45 | return 0; |
46 | } |
47 | |