mfbt/tests/TestTypeTraits.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include <type_traits>
   8
   9 #include "mozilla/Assertions.h"
  10 #include "mozilla/TypeTraits.h"
  11
  12 using mozilla::IsDestructible;
  13
  14 class PublicDestructible {
  15  public:
  16   ~PublicDestructible();
  17 };
  18 class PrivateDestructible {
  19  private:
  20   ~PrivateDestructible();
  21 };
  22 class TrivialDestructible {};
  23
  24 static_assert(IsDestructible<PublicDestructible>::value,
  25               "public destructible class is destructible");
  26 static_assert(!IsDestructible<PrivateDestructible>::value,
  27               "private destructible class is not destructible");
  28 static_assert(IsDestructible<TrivialDestructible>::value,
  29               "trivial destructible class is destructible");
  30
  31 /*
  32  * Android's broken [u]intptr_t inttype macros are broken because its PRI*PTR
  33  * macros are defined as "ld", but sizeof(long) is 8 and sizeof(intptr_t)
  34  * is 4 on 32-bit Android. We redefine Android's PRI*PTR macros in
  35  * IntegerPrintfMacros.h and assert here that our new definitions match the
  36  * actual type sizes seen at compile time.
  37  */
  38 #if defined(ANDROID) && !defined(__LP64__)
  39 static_assert(std::is_same_v<int, intptr_t>,
  40               "emulated PRI[di]PTR definitions will be wrong");
  41 static_assert(std::is_same_v<unsigned int, uintptr_t>,
  42               "emulated PRI[ouxX]PTR definitions will be wrong");
  43 #endif
  44
  45 int main() { return 0; }