C++ (Cpp) mozilla::ToMaybe Examples

Example #1

File: TestMaybe.cpp Project: zbraniecki/gecko-dev

static bool
TestToMaybe()
{
  BasicValue value(1);
  BasicValue* nullPointer = nullptr;

  // Check that a non-null pointer translates into a Some value.
  Maybe<BasicValue> mayValue = ToMaybe(&value);
  static_assert(IsSame<Maybe<BasicValue>, DECLTYPE(ToMaybe(&value))>::value,
                "ToMaybe should return a Maybe<BasicValue>");
  MOZ_RELEASE_ASSERT(mayValue.isSome());
  MOZ_RELEASE_ASSERT(mayValue->GetTag() == 1);
  MOZ_RELEASE_ASSERT(mayValue->GetStatus() == eWasCopyConstructed);
  MOZ_RELEASE_ASSERT(value.GetStatus() != eWasMovedFrom);

  // Check that a null pointer translates into a Nothing value.
  mayValue = ToMaybe(nullPointer);
  static_assert(IsSame<Maybe<BasicValue>, DECLTYPE(ToMaybe(nullPointer))>::value,
                "ToMaybe should return a Maybe<BasicValue>");
  MOZ_RELEASE_ASSERT(mayValue.isNothing());

  return true;
}