谷歌模拟测试:: internal :: ReturnAction <r>数组负大小

Question

我有测试代码，类似

EXPECT_CALL(mock, getSomeString()).WillOnce(Return(&testString));

其中getSomeString()通过引用返回：

std:string& getSomeString();

并获取

../../../../src/test/unit/gmock/gmock-actions.h: In member function ‘testing::internal::ReturnAction<R>::operator testing::Action<Func>() const [with F = const std::string&(), R = std::basic_string<char, std::char_traits<char>, std::allocator<char> >]’:
../../../../src/test/unit/MyTests.cc:148:   instantiated from here
../../../../src/test/unit/gmock/gmock-actions.h:467: error: creating array with negative size (‘-0x00000000000000001’)

原因是什么？

Answer 1

检查gmock-actions.h：467，你会看到：

GMOCK_COMPILE_ASSERT_(
        !internal::is_reference<Result>::value,
        use_ReturnRef_instead_of_Return_to_return_a_reference);

所以答案是使用ReturnRef代替Return：

EXPECT_CALL(mock, getSomeString()).WillOnce(ReturnRef(testString));