libcxx/test/std/utilities/meta/meta.help/bool_constant.pass.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 // type_traits
  10
  11 // bool_constant
  12
  13 #include <type_traits>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17
  18 int main(int, char**)
  19 {
  20 #if TEST_STD_VER > 14
  21     typedef std::bool_constant<true> _t;
  22     static_assert(_t::value, "");
  23     static_assert((std::is_same<_t::value_type, bool>::value), "");
  24     static_assert((std::is_same<_t::type, _t>::value), "");
  25     static_assert((_t() == true), "");
  26
  27     typedef std::bool_constant<false> _f;
  28     static_assert(!_f::value, "");
  29     static_assert((std::is_same<_f::value_type, bool>::value), "");
  30     static_assert((std::is_same<_f::type, _f>::value), "");
  31     static_assert((_f() == false), "");
  32 #endif
  33
  34   return 0;
  35 }