42 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11#include <cassert>12#include <map>13 14// <map>15 16// template<class K> bool contains(const K& x) const; // C++2017 18struct Comp {19 using is_transparent = void;20 21 bool operator()(const std::pair<int, int>& lhs, const std::pair<int, int>& rhs) const { return lhs < rhs; }22 23 bool operator()(const std::pair<int, int>& lhs, int rhs) const { return lhs.first < rhs; }24 25 bool operator()(int lhs, const std::pair<int, int>& rhs) const { return lhs < rhs.first; }26};27 28template <typename Container>29void test() {30 Container s{{{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};31 32 assert(s.contains(1));33 assert(!s.contains(-1));34}35 36int main(int, char**) {37 test<std::map<std::pair<int, int>, int, Comp> >();38 test<std::multimap<std::pair<int, int>, int, Comp> >();39 40 return 0;41}42