64 lines
2.1 KiB
C++
64 lines
2.1 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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// template<class F, class... Args>
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// concept predicate;
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#include <concepts>
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#include <type_traits>
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static_assert(std::predicate<bool()>);
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static_assert(std::predicate<bool (*)()>);
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static_assert(std::predicate<bool (&)()>);
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static_assert(!std::predicate<void()>);
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static_assert(!std::predicate<void (*)()>);
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static_assert(!std::predicate<void (&)()>);
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struct S {};
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static_assert(!std::predicate<S(int), int>);
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static_assert(!std::predicate<S(double), double>);
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static_assert(std::predicate<int S::*, S*>);
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static_assert(std::predicate<int (S::*)(), S*>);
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static_assert(std::predicate<int (S::*)(), S&>);
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static_assert(!std::predicate<void (S::*)(), S*>);
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static_assert(!std::predicate<void (S::*)(), S&>);
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static_assert(!std::predicate<bool(S)>);
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static_assert(!std::predicate<bool(S&), S>);
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static_assert(!std::predicate<bool(S&), S const&>);
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static_assert(std::predicate<bool(S&), S&>);
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struct Predicate {
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bool operator()(int, double, char);
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};
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static_assert(std::predicate<Predicate, int, double, char>);
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static_assert(std::predicate<Predicate&, int, double, char>);
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static_assert(!std::predicate<const Predicate, int, double, char>);
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static_assert(!std::predicate<const Predicate&, int, double, char>);
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constexpr bool check_lambda(auto) { return false; }
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constexpr bool check_lambda(std::predicate auto) { return true; }
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static_assert(check_lambda([] { return std::true_type(); }));
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static_assert(check_lambda([]() -> int* { return nullptr; }));
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struct boolean {
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operator bool() const noexcept;
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};
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static_assert(check_lambda([] { return boolean(); }));
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struct explicit_bool {
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explicit operator bool() const noexcept;
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};
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static_assert(!check_lambda([] { return explicit_bool(); }));
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