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// <set>
12
13// class set
14
15// template<typename K> bool contains(const K& x) const; // C++20
16
17#include <cassert>
18#include <set>
19#include <utility>
20
21struct Comp {
22 using is_transparent = void;
23
24 bool operator()(const std::pair<int, int>& lhs,
25 const std::pair<int, int>& rhs) const {
26 return lhs < rhs;
27 }
28
29 bool operator()(const std::pair<int, int>& lhs, int rhs) const {
30 return lhs.first < rhs;
31 }
32
33 bool operator()(int lhs, const std::pair<int, int>& rhs) const {
34 return lhs < rhs.first;
35 }
36};
37
38template <typename Container>
39void test() {
40 Container s{{2, 1}, {1, 2}, {1, 3}, {1, 4}, {2, 2}};
41
42 assert(s.contains(1));
43 assert(!s.contains(-1));
44}
45
46int main(int, char**) {
47 test<std::set<std::pair<int, int>, Comp> >();
48 test<std::multiset<std::pair<int, int>, Comp> >();
49
50 return 0;
51}
52

source code of libcxx/test/std/containers/associative/set/contains_transparent.pass.cpp