libcxx/test/std/language.support/support.dynamic/destroying_delete_t_declaration.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 // struct destroying_delete_t {
  10 //   explicit destroying_delete_t() = default;
  11 // };
  12 // inline constexpr destroying_delete_t destroying_delete{};
  13
  14 // UNSUPPORTED: c++03, c++11, c++14, c++17
  15
  16 // Test only the library parts of destroying delete in this test.
  17 // Verify that it's properly declared after C++17 and that it's constexpr.
  18 //
  19 // Other tests will check the language side of things -- but those are
  20 // limited to newer compilers.
  21
  22 #include <new>
  23
  24 #include <cassert>
  25 #include <type_traits>
  26
  27 #include "test_macros.h"
  28 #include "test_convertible.h"
  29
  30 #ifdef __cpp_impl_destroying_delete
  31 # ifndef __cpp_lib_destroying_delete
  32 #   error "Expected __cpp_lib_destroying_delete to be defined"
  33 #   elif __cpp_lib_destroying_delete < 201806L
  34 #     error "Unexpected value of __cpp_lib_destroying_delete"
  35 #   endif
  36 #else
  37 # ifdef __cpp_lib_destroying_delete
  38 #   error "__cpp_lib_destroying_delete should not be defined unless the compiler supports it"
  39 # endif
  40 #endif
  41
  42 constexpr bool test_constexpr(std::destroying_delete_t) {
  43   return true;
  44 }
  45
  46 int main(int, char**) {
  47   static_assert(std::is_default_constructible<std::destroying_delete_t>::value, "");
  48   static_assert(!test_convertible<std::destroying_delete_t>(), "");
  49   constexpr std::destroying_delete_t dd{};
  50   static_assert(&dd != &std::destroying_delete, "");
  51   static_assert(test_constexpr(std::destroying_delete), "");
  52   return 0;
  53 }