libcxx/test/std/language.support/support.dynamic/destroying_delete_t.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 #include <new>
  18
  19 #include <cassert>
  20 #include "test_macros.h"
  21
  22 struct A {
  23   void *data;
  24   A();
  25   ~A();
  26
  27   static A* New();
  28   void operator delete(A*, std::destroying_delete_t);
  29 };
  30
  31 bool A_constructed = false;
  32 bool A_destroyed = false;
  33 bool A_destroying_deleted = false;
  34
  35 A::A() {
  36   A_constructed = true;
  37 }
  38
  39 A::~A() {
  40   A_destroyed = true;
  41 }
  42
  43 A* A::New() {
  44   return new(::operator new(sizeof(A))) A();
  45 }
  46
  47 void A::operator delete(A* a, std::destroying_delete_t) {
  48   A_destroying_deleted = true;
  49   ::operator delete(a);
  50 }
  51
  52 // Only test the definition of the library feature-test macro when the compiler
  53 // supports the feature -- otherwise we don't define the library feature-test
  54 // macro.
  55 #if defined(__cpp_impl_destroying_delete)
  56 #  if !defined(__cpp_lib_destroying_delete)
  57 #    error "Expected __cpp_lib_destroying_delete to be defined"
  58 #  elif __cpp_lib_destroying_delete < 201806L
  59 #    error "Unexpected value of __cpp_lib_destroying_delete"
  60 #  endif
  61 #else
  62 #  if defined(__cpp_lib_destroying_delete)
  63 #    error "The library feature-test macro for destroying delete shouldn't be defined when the compiler doesn't support the language feature"
  64 #  endif
  65 #endif
  66
  67 int main(int, char**) {
  68   // Ensure that we call the destroying delete and not the destructor.
  69   A* ap = A::New();
  70   assert(A_constructed);
  71   delete ap;
  72   assert(!A_destroyed);
  73   assert(A_destroying_deleted);
  74   return 0;
  75 }