test/std/language.support/support.dynamic/destroying_delete_t_declaration.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// struct destroying_delete_t {
//   explicit destroying_delete_t() = default;
// };
// inline constexpr destroying_delete_t destroying_delete{};

// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17

// Test only the library parts of destroying delete in this test.
// Verify that it's properly declared after C++17 and that it's constexpr.
//
// Other tests will check the language side of things -- but those are
// limited to newer compilers.

#include <new>

#include <cassert>
#include "test_macros.h"
#include "test_convertible.hpp"

#ifdef __cpp_impl_destroying_delete
# ifndef __cpp_lib_destroying_delete
#   error "Expected __cpp_lib_destroying_delete to be defined"
#   elif __cpp_lib_destroying_delete < 201806L
#     error "Unexpected value of __cpp_lib_destroying_delete"
#   endif
#else
# ifdef __cpp_lib_destroying_delete
#   error "__cpp_lib_destroying_delete should not be defined unless the compiler supports it"
# endif
#endif

constexpr bool test_constexpr(std::destroying_delete_t) {
  return true;
}

int main() {
  static_assert(std::is_default_constructible<std::destroying_delete_t>::value, "");
  static_assert(!test_convertible<std::destroying_delete_t>(), "");
  constexpr std::destroying_delete_t dd{};
  static_assert((dd, true), "");
  static_assert(&dd != &std::destroying_delete, "");
  static_assert(test_constexpr(std::destroying_delete), "");
}