llvm-project/libcxx/test/std/utilities/meta/meta.const.eval/is_constant_evaluated.fail.cpp
Eric Fiselier f97936fabd [libc++] Cleanup and enable multiple warnings.
Too many warnings are being disabled too quickly. Warnings are
important to keeping libc++ correct. This patch re-enables two
warnings: -Wconstant-evaluated and -Wdeprecated-copy.

In future, all warnings disabled for the test suite should require
an attached bug. The bug should state the plan for re-enabling that
warning, or a strong case why it should remain disabled.
2019-12-12 21:09:08 -05:00

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03
// <type_traits>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
#ifndef __cpp_lib_is_constant_evaluated
// expected-error@+1 {{no member named 'is_constant_evaluated' in namespace 'std'}}
bool b = std::is_constant_evaluated();
#else
// expected-error@+1 {{static_assert failed}}
static_assert(!std::is_constant_evaluated(), "");
// expected-error@-1 0-1 {{'std::is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
#endif
return 0;
}