libcxx/test/std/utilities/variant/variant.monostate/monostate.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 // UNSUPPORTED: c++03, c++11, c++14
  10
  11 // <variant>
  12
  13 // struct monostate {};
  14
  15 #include <type_traits>
  16 #include <variant>
  17
  18 #include "test_macros.h"
  19
  20 int main(int, char**) {
  21   using M = std::monostate;
  22   static_assert(std::is_trivially_default_constructible<M>::value, "");
  23   static_assert(std::is_trivially_copy_constructible<M>::value, "");
  24   static_assert(std::is_trivially_copy_assignable<M>::value, "");
  25   static_assert(std::is_trivially_destructible<M>::value, "");
  26   constexpr M m{};
  27   ((void)m);
  28
  29   return 0;
  30 }