3fca07d7b9
Commit rGa17b1aed added `bool contains(const key_type& x) const;` methods to associative containers, but didn't add `template<class K> bool contains(const K& x) const;` for heterogenous lookup. Reviewed By: #libc, Quuxplusone, ldionne Differential Revision: https://reviews.llvm.org/D100369
49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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#include <cassert>
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#include <map>
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// <map>
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// template<class K> bool contains(const K& x) const; // C++20
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struct Comp {
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using is_transparent = void;
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bool operator()(const std::pair<int, int>& lhs,
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const std::pair<int, int>& rhs) const {
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return lhs < rhs;
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}
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bool operator()(const std::pair<int, int>& lhs, int rhs) const {
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return lhs.first < rhs;
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}
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bool operator()(int lhs, const std::pair<int, int>& rhs) const {
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return lhs < rhs.first;
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}
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};
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template <typename Container>
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void test() {
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Container s{{{2, 1}, 1}, {{1, 2}, 2}, {{1, 3}, 3}, {{1, 4}, 4}, {{2, 2}, 5}};
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assert(s.contains(1));
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assert(!s.contains(-1));
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}
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int main(int, char**) {
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test<std::map<std::pair<int, int>, int, Comp> >();
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test<std::multimap<std::pair<int, int>, int, Comp> >();
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return 0;
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}
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