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

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // struct destroying_delete_t {
  11 //   explicit destroying_delete_t() = default;
  12 // };
  13 // inline constexpr destroying_delete_t destroying_delete{};
  14
  15 // UNSUPPORTED: c++03, c++11, c++14, c++17
  16
  17 // Test only the library parts of destroying delete in this test.
  18 // Verify that it's properly declared after C++17 and that it's constexpr.
  19 //
  20 // Other tests will check the language side of things -- but those are
  21 // limited to newer compilers.
  22
  23 #include <new>
  24
  25 #include <cassert>
  26 #include "test_macros.h"
  27 #include "test_convertible.h"
  28
  29 #ifdef __cpp_impl_destroying_delete
  30 # ifndef __cpp_lib_destroying_delete
  31 #   error "Expected __cpp_lib_destroying_delete to be defined"
  32 #   elif __cpp_lib_destroying_delete < 201806L
  33 #     error "Unexpected value of __cpp_lib_destroying_delete"
  34 #   endif
  35 #else
  36 # ifdef __cpp_lib_destroying_delete
  37 #   error "__cpp_lib_destroying_delete should not be defined unless the compiler supports it"
  38 # endif
  39 #endif
  40
  41 constexpr bool test_constexpr(std::destroying_delete_t) {
  42   return true;
  43 }
  44
  45 int main(int, char**) {
  46   static_assert(std::is_default_constructible<std::destroying_delete_t>::value, "");
  47   static_assert(!test_convertible<std::destroying_delete_t>(), "");
  48   constexpr std::destroying_delete_t dd{};
  49   static_assert(&dd != &std::destroying_delete, "");
  50   static_assert(test_constexpr(std::destroying_delete), "");
  51   return 0;
  52 }