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 map
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 
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::map<std::pair<int, int>, int, Comp> s{
41       {{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
42 
43   auto cnt = s.count(1);
44   assert(cnt == 3);
45 
46   return 0;
47 }
48