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50 lines
1.4 KiB
C++
50 lines
1.4 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++98, c++03
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// REQUIRES: diagnose-if-support, verify-support
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// Test that libc++ generates a warning diagnostic when the container is
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// provided a non-const callable comparator.
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#include <set>
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#include <map>
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struct BadCompare {
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template <class T, class U>
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bool operator()(T const& t, U const& u) {
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return t < u;
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}
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};
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int main(int, char**) {
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static_assert(!std::__invokable<BadCompare const&, int const&, int const&>::value, "");
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static_assert(std::__invokable<BadCompare&, int const&, int const&>::value, "");
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// expected-warning@set:* 2 {{the specified comparator type does not provide a viable const call operator}}
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// expected-warning@map:* 2 {{the specified comparator type does not provide a viable const call operator}}
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{
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using C = std::set<int, BadCompare>;
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C s;
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}
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{
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using C = std::multiset<long, BadCompare>;
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C s;
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}
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{
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using C = std::map<int, int, BadCompare>;
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C s;
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}
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{
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using C = std::multimap<long, int, BadCompare>;
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C s;
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}
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return 0;
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}
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