I cant for the love of god understand what this compiler error is trying to tell me:
Reproduced here on godbolt: https://godbolt.org/z/v3M5hEbdv
#include "gtest/gtest.h"
#include "gmock/gmock.h"
#include <string>
#include <functional>
#include <vector>
class MyService {
public:
virtual ~MyService() = default;
virtual void bar(
std::function<void (std::vector<std::string>&&)> onSuccess
) = 0;
};
class MyServiceMock : public MyService
{
public:
MOCK_METHOD(
void,
bar,
(std::function<void(std::vector<std::string>&&)> onSuccess),
(override)
);
};
[[maybe_unused]]
void foo() {
testing::NiceMock<MyServiceMock> myService;
EXPECT_CALL(myService, bar(testing::_))
.Times(testing::Exactly(1))
.WillOnce(testing::DoAll(
testing::Return(),
testing::InvokeArgument<0>(
std::vector<std::string>({"hello", "world"})
)
));
}
int main() {
return 0;
}
The compiler error :
Output of x86-64 gcc 11.2 (Compiler #1)
In file included from /opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/unique_ptr.h:37,
from /opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/memory:76,
from /opt/compiler-explorer/libs/googletest/trunk/googletest/include/gtest/gtest.h:55,
from <source>:1:
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple: In instantiation of 'struct std::tuple_element<0, std::tuple<> >':
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/utility:118:11: required by substitution of 'template<long unsigned int __i, class _Tp> using __tuple_element_t = typename std::tuple_element::type [with long unsigned int __i = 0; _Tp = std::tuple<>]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1403:5: required by substitution of 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_UTypes ...> >&& std::get(const std::tuple<_UTypes ...>&&) [with long unsigned int __i = 0; _Elements = {}]'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-more-actions.h:515:22: required by substitution of 'template<class ... Args> decltype (testing::internal::InvokeArgument(get<0>(std::forward_as_tuple((forward<Args>)(testing::internal::InvokeArgumentAction<index, Params ...>::operator()::args)...)), declval<const std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&>())) testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::operator()<Args ...>(Args&& ...) const [with Args = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2466:26: required by substitution of 'template<class _Fn, class ... _Args> static std::__result_of_success<decltype (declval<_Fn>()((declval<_Args>)()...)), std::__invoke_other> std::__result_of_other_impl::_S_test(int) [with _Fn = testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&; _Args = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2477:55: required from 'struct std::__result_of_impl<false, false, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2482:12: [ skipping 3 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/std_function.h:344:8: required by substitution of 'template<class _Res, class ... _ArgTypes> template<class _Cond, class _Tp> using _Requires = typename std::enable_if<_Cond::value, _Tp>::type [with _Cond = std::function<void()>::_Callable<testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::__invoke_result<testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&> >; _Tp = void; _Res = void; _ArgTypes = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/std_function.h:413:9: required by substitution of 'template<class _Functor, class, class> std::function<void()>::function(_Functor) [with _Functor = testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >; <template-parameter-1-2> = void; <template-parameter-1-3> = <missing>]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:906:30: required from 'struct std::__is_constructible_impl<std::function<void()>, const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:911:12: required from 'struct std::is_constructible<std::function<void()>, const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:466:7: required by substitution of 'template<class G, class> testing::Action<void(std::function<void(std::vector<std::__cxx11::basic_string<char> >&&)>)>::Action(G&&) [with G = const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&; <template-parameter-1-2> = <missing>]'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:1061:56: required from 'testing::internal::DoAllAction<Actions>::operator testing::Action<R(Args ...)>() const [with R = void; Args = {std::function<void(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&&)>}; Actions = {testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}]'
<source>:33:18: required from here
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1360:25: error: static assertion failed: tuple index must be in range
1360 | static_assert(__i < tuple_size<tuple<>>::value,
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1360:25: note: '(0 < ((long unsigned int)std::integral_constant<long unsigned int, 0>::value))' evaluates to false
In file included from /opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock.h:57,
from <source>:2:
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h: In instantiation of 'testing::internal::DoAllAction<Actions>::operator testing::Action<R(Args ...)>() const [with R = void; Args = {std::function<void(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&&)>}; Actions = {testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}]':
<source>:33:18: required from here
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:1061:56: error: could not convert 'std::get<1, testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >(((const testing::internal::DoAllAction<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >*)this)->testing::internal::DoAllAction<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >::actions)' from 'std::__tuple_element_t<1, std::tuple<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > >' {aka 'const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >'} to 'testing::Action<void(std::function<void(std::vector<std::__cxx11::basic_string<char> >&&)>)>'
1061 | std::get<sizeof...(Actions) - 1>(actions)};
| ^
| |
| std::__tuple_element_t<1, std::tuple<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > {aka const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}
ASM generation compiler returned: 1
In file included from /opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/unique_ptr.h:37,
from /opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/memory:76,
from /opt/compiler-explorer/libs/googletest/trunk/googletest/include/gtest/gtest.h:55,
from <source>:1:
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple: In instantiation of 'struct std::tuple_element<0, std::tuple<> >':
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/utility:118:11: required by substitution of 'template<long unsigned int __i, class _Tp> using __tuple_element_t = typename std::tuple_element::type [with long unsigned int __i = 0; _Tp = std::tuple<>]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1403:5: required by substitution of 'template<long unsigned int __i, class ... _Elements> constexpr std::__tuple_element_t<__i, std::tuple<_UTypes ...> >&& std::get(const std::tuple<_UTypes ...>&&) [with long unsigned int __i = 0; _Elements = {}]'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-more-actions.h:515:22: required by substitution of 'template<class ... Args> decltype (testing::internal::InvokeArgument(get<0>(std::forward_as_tuple((forward<Args>)(testing::internal::InvokeArgumentAction<index, Params ...>::operator()::args)...)), declval<const std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&>())) testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::operator()<Args ...>(Args&& ...) const [with Args = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2466:26: required by substitution of 'template<class _Fn, class ... _Args> static std::__result_of_success<decltype (declval<_Fn>()((declval<_Args>)()...)), std::__invoke_other> std::__result_of_other_impl::_S_test(int) [with _Fn = testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&; _Args = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2477:55: required from 'struct std::__result_of_impl<false, false, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:2482:12: [ skipping 3 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/std_function.h:344:8: required by substitution of 'template<class _Res, class ... _ArgTypes> template<class _Cond, class _Tp> using _Requires = typename std::enable_if<_Cond::value, _Tp>::type [with _Cond = std::function<void()>::_Callable<testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::__invoke_result<testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&> >; _Tp = void; _Res = void; _ArgTypes = {}]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/bits/std_function.h:413:9: required by substitution of 'template<class _Functor, class, class> std::function<void()>::function(_Functor) [with _Functor = testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >; <template-parameter-1-2> = void; <template-parameter-1-3> = <missing>]'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:906:30: required from 'struct std::__is_constructible_impl<std::function<void()>, const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/type_traits:911:12: required from 'struct std::is_constructible<std::function<void()>, const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&>'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:466:7: required by substitution of 'template<class G, class> testing::Action<void(std::function<void(std::vector<std::__cxx11::basic_string<char> >&&)>)>::Action(G&&) [with G = const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&; <template-parameter-1-2> = <missing>]'
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:1061:56: required from 'testing::internal::DoAllAction<Actions>::operator testing::Action<R(Args ...)>() const [with R = void; Args = {std::function<void(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&&)>}; Actions = {testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}]'
<source>:33:18: required from here
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1360:25: error: static assertion failed: tuple index must be in range
1360 | static_assert(__i < tuple_size<tuple<>>::value,
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/compiler-explorer/gcc-11.2.0/include/c++/11.2.0/tuple:1360:25: note: '(0 < ((long unsigned int)std::integral_constant<long unsigned int, 0>::value))' evaluates to false
In file included from /opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock.h:57,
from <source>:2:
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h: In instantiation of 'testing::internal::DoAllAction<Actions>::operator testing::Action<R(Args ...)>() const [with R = void; Args = {std::function<void(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&&)>}; Actions = {testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}]':
<source>:33:18: required from here
/opt/compiler-explorer/libs/googletest/trunk/googlemock/include/gmock/gmock-actions.h:1061:56: error: could not convert 'std::get<1, testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >(((const testing::internal::DoAllAction<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >*)this)->testing::internal::DoAllAction<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >::actions)' from 'std::__tuple_element_t<1, std::tuple<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > >' {aka 'const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >'} to 'testing::Action<void(std::function<void(std::vector<std::__cxx11::basic_string<char> >&&)>)>'
1061 | std::get<sizeof...(Actions) - 1>(actions)};
| ^
| |
| std::__tuple_element_t<1, std::tuple<testing::PolymorphicAction<testing::internal::ReturnVoidAction>, testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > > {aka const testing::internal::InvokeArgumentAction<0, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >}
Execution build compiler returned: 1
If I remove the &&and change the argument to the function from a rvalue reference into a copy, it compiles fine. What could be happening here?
It seems it is unable to work with r-value references. The workaround:
EXPECT_CALL(myService, bar(testing::_)).WillOnce(
testing::WithArg<0>(
[] (std::function<void (std::vector<std::string>&&)> f) {
f({"hello", "world"});
}
)
Related issue has been closed for some reasons Add support for move only parameters in mocked methods.