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51 lines
1.5 KiB
C++
51 lines
1.5 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, c++11, c++14, c++17
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// <type_traits>
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// constexpr bool is_constant_evaluated() noexcept; // C++20
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#ifndef __cpp_lib_is_constant_evaluated
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#if TEST_HAS_BUILTIN(__builtin_is_constant_evaluated)
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# error __cpp_lib_is_constant_evaluated should be defined
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#endif
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#endif
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template <bool> struct InTemplate {};
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int main(int, char**)
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{
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#ifdef __cpp_lib_is_constant_evaluated
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// Test the signature
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{
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ASSERT_SAME_TYPE(decltype(std::is_constant_evaluated()), bool);
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ASSERT_NOEXCEPT(std::is_constant_evaluated());
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constexpr bool p = std::is_constant_evaluated();
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assert(p);
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}
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// Test the return value of the builtin for basic sanity only. It's the
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// compilers job to test tho builtin for correctness.
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{
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static_assert(std::is_constant_evaluated(), "");
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bool p = std::is_constant_evaluated();
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assert(!p);
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ASSERT_SAME_TYPE(InTemplate<std::is_constant_evaluated()>, InTemplate<true>);
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static int local_static = std::is_constant_evaluated() ? 42 : -1;
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assert(local_static == 42);
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}
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#endif
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return 0;
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}
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