libcxx/test/std/utilities/meta/meta.const.eval/is_constant_evaluated.verify.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03
  10
  11 // <type_traits>
  12
  13
  14 #include <type_traits>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18
  19 int main(int, char**)
  20 {
  21 #ifndef __cpp_lib_is_constant_evaluated
  22   // expected-error@+1 {{no member named 'is_constant_evaluated' in namespace 'std'}}
  23   bool b = std::is_constant_evaluated();
  24 #else
  25   // expected-error@+1 {{static assertion failed}}
  26   static_assert(!std::is_constant_evaluated(), "");
  27   // expected-warning@-1 0-1 {{'std::is_constant_evaluated' will always evaluate to 'true' in a manifestly constant-evaluated expression}}
  28 #endif
  29   return 0;
  30 }