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, c++14, c++17
10
11 #include <cassert>
12 #include <map>
13
14 // <map>
15
16 // template<class K> bool contains(const K& x) const; // C++20
17
18 struct Comp {
19 using is_transparent = void;
20
operator ()Comp21 bool operator()(const std::pair<int, int>& lhs,
22 const std::pair<int, int>& rhs) const {
23 return lhs < rhs;
24 }
25
operator ()Comp26 bool operator()(const std::pair<int, int>& lhs, int rhs) const {
27 return lhs.first < rhs;
28 }
29
operator ()Comp30 bool operator()(int lhs, const std::pair<int, int>& rhs) const {
31 return lhs < rhs.first;
32 }
33 };
34
35 template <typename Container>
test()36 void test() {
37 Container s{{{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
38
39 assert(s.contains(1));
40 assert(!s.contains(-1));
41 }
42
main(int,char **)43 int main(int, char**) {
44 test<std::map<std::pair<int, int>, int, Comp> >();
45 test<std::multimap<std::pair<int, int>, int, Comp> >();
46
47 return 0;
48 }
49