#c #visual-studio #stl #c 17 #googletest
Вопрос:
У нас есть TEST код, содержащий именно этот код (первоначально string это был пользовательский тип, но я провел новый тест, string чтобы убедиться, что он все еще не удался).:
std::string s1("aaa"), s2("bbb"), s3("ccc");
std::vector<std::reference_wrapper<std::string>> vec;
vec.push_back(std::ref(s1));
vec.push_back(std::ref(s2));
vec.push_back(std::ref(s3));
EXPECT_THAT(vec, ElementsAre(
std::reference_wrapper<std::string>(s1),
std::reference_wrapper<std::string>(s2),
std::reference_wrapper<std::string>(s3)));
Этот код, ранее скомпилированный под VS2017 (v141, c 11) с GTest 1.8.1, но против VS2019 (v142, c 17) и GTest 1.11, мы получаем самое красивое сообщение об ошибке, показанное ниже в полном объеме.
Это vector references_wrappers кажется немного странным, но не беспрецедентным. Я пытаюсь понять, почему он компилировался раньше, а теперь нет. Почему ElementsAre он ненавидит это?
Примечание для тех, кому интересно, почему я это тестирую, в нашем реальном коде-тест vec возвращается функцией, которую мы хотим протестировать, например:
x.Add(std::string("aaa"));
x.Add(std::string("bbb"));
x.Add(std::string("ccc"));
auto vec = x.Get();
Но мой точный тест выше дает ту же ошибку, так что его проще воспроизвести.
c:vcpkgincludegtestgtest-matchers.h(179,49): error C2678: binary '==': no operator found which takes a left-hand operand of type 'const A' (or there is no acceptable conversion)
with
[
A=Element
]
c:vcpkgincludegtestgtest.h(1536,13): message : could be 'bool testing::internal::operator ==(testing::internal::faketype,testing::internal::faketype)'
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includeexception(267,28): message : or 'bool std::operator ==(const std::exception_ptr amp;,const std::exception_ptr amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includeexception(271,28): message : or 'bool std::operator ==(std::nullptr_t,const std::exception_ptr amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includeexception(275,28): message : or 'bool std::operator ==(const std::exception_ptr amp;,std::nullptr_t) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includesystem_error(168,28): message : or 'bool std::operator ==(const std::error_code amp;,const std::error_code amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includesystem_error(172,28): message : or 'bool std::operator ==(const std::error_code amp;,const std::error_condition amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includesystem_error(176,28): message : or 'bool std::operator ==(const std::error_condition amp;,const std::error_code amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includesystem_error(248,28): message : or 'bool std::operator ==(const std::error_condition amp;,const std::error_condition amp;) noexcept' [found using argument-dependent lookup]
C:Program Files (x86)Microsoft Visual Studio2019ProfessionalVCToolsMSVC14.28.29333includethread(204,24): message : or 'bool std::operator ==(std::thread::id,std::thread::id) noexcept' [found using argument-dependent lookup]
c:vcpkgincludegtestgtest-matchers.h(179,49): message : while trying to match the argument list '(const A, const B)'
with
[
A=Element
]
and
[
B=std::string
]
c:vcpkgincludegtestgtest-matchers.h(716): message : see reference to function template instantiation 'bool testing::internal::AnyEq::operator ()<Lhs,T>(const A amp;,const B amp;) const' being compiled
with
[
Lhs=Element,
T=std::string,
A=Element,
B=std::string
]
c:vcpkgincludegtestgtest-matchers.h(352): message : see reference to function template instantiation 'bool testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::MatchAndExplain<Element>(const Lhs amp;,std::ostream *) const' being compiled
with
[
Rhs=Element,
Lhs=Element
]
c:vcpkgincludegtestgtest-matchers.h(352): message : see reference to function template instantiation 'bool testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::MatchAndExplain<Element>(const Lhs amp;,std::ostream *) const' being compiled
with
[
Rhs=Element,
Lhs=Element
]
c:vcpkgincludegtestgtest-matchers.h(392): message : see reference to function template instantiation 'bool testing::internal::MatcherBase<T>::MatchAndExplainImpl<P>(const testing::internal::MatcherBase<T> amp;,T,testing::MatchResultListener *)' being compiled
with
[
T=const Element amp;,
P=Policy
]
c:vcpkgincludegtestgtest-matchers.h(392): message : see reference to function template instantiation 'bool testing::internal::MatcherBase<T>::MatchAndExplainImpl<P>(const testing::internal::MatcherBase<T> amp;,T,testing::MatchResultListener *)' being compiled
with
[
T=const Element amp;,
P=Policy
]
c:vcpkgincludegtestgtest-matchers.h(464): message : see reference to function template instantiation 'const testing::internal::MatcherBase<T>::VTable *testing::internal::MatcherBase<T>::GetVTable<Policy>(void)' being compiled
with
[
T=const Element amp;
]
c:vcpkgincludegtestgtest-matchers.h(464): message : see reference to function template instantiation 'const testing::internal::MatcherBase<T>::VTable *testing::internal::MatcherBase<T>::GetVTable<Policy>(void)' being compiled
with
[
T=const Element amp;
]
c:vcpkgincludegtestgtest-matchers.h(298): message : see reference to function template instantiation 'void testing::internal::MatcherBase<T>::Init<_Ty>(M amp;amp;)' being compiled
with
[
T=const Element amp;,
_Ty=testing::internal::EqMatcher<Element>,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(298): message : see reference to function template instantiation 'void testing::internal::MatcherBase<T>::Init<_Ty>(M amp;amp;)' being compiled
with
[
T=const Element amp;,
_Ty=testing::internal::EqMatcher<Element>,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(499): message : see reference to function template instantiation 'testing::internal::MatcherBase<T>::MatcherBase<_Ty,testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::is_gtest_matcher>(M amp;amp;)' being compiled
with
[
T=const Element amp;,
_Ty=testing::internal::EqMatcher<Element>,
Rhs=Element,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(499): message : see reference to function template instantiation 'testing::internal::MatcherBase<T>::MatcherBase<_Ty,testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::is_gtest_matcher>(M amp;amp;)' being compiled
with
[
T=const Element amp;,
_Ty=testing::internal::EqMatcher<Element>,
Rhs=Element,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(880): message : see reference to function template instantiation 'testing::Matcher<const Element amp;>::Matcher<testing::internal::EqMatcher<Element>,testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::is_gtest_matcher>(M amp;amp;)' being compiled
with
[
Rhs=Element,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(880): message : see reference to function template instantiation 'testing::Matcher<const Element amp;>::Matcher<testing::internal::EqMatcher<Element>,testing::internal::ComparisonBase<testing::internal::EqMatcher<Element>,Rhs,testing::internal::AnyEq>::is_gtest_matcher>(M amp;amp;)' being compiled
with
[
Rhs=Element,
M=testing::internal::EqMatcher<Element>
]
c:vcpkgincludegtestgtest-matchers.h(880): message : while compiling class template member function 'testing::Matcher<const Element amp;>::Matcher(T)'
with
[
T=const Element amp;
]
c:vcpkgincludegmockgmock-matchers.h(368): message : see reference to function template instantiation 'testing::Matcher<const Element amp;>::Matcher(T)' being compiled
with
[
T=const Element amp;
]
c:vcpkgincludegmockgmock-matchers.h(352): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::internal::MatcherCastImpl<T,M>::CastImpl<true>(const M amp;,std::true_type,std::integral_constant<bool,true>)' being compiled
with
[
T=const Element amp;,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(350): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::internal::MatcherCastImpl<T,M>::CastImpl<true>(const M amp;,std::true_type,std::integral_constant<bool,true>)' being compiled
with
[
T=const Element amp;,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(336): message : while compiling class template member function 'testing::Matcher<const Element amp;> testing::internal::MatcherCastImpl<T,M>::Cast(const M amp;)'
with
[
T=const Element amp;,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(510): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::internal::MatcherCastImpl<T,M>::Cast(const M amp;)' being compiled
with
[
T=const Element amp;,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(510): message : see reference to class template instantiation 'testing::internal::MatcherCastImpl<T,M>' being compiled
with
[
T=const Element amp;,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(3523): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::MatcherCast<Target,Arg>(const M amp;)' being compiled
with
[
Target=const Element amp;,
Arg=std::reference_wrapper<std::string>,
M=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(718): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::internal::CastAndAppendTransform<const Element amp;>::operator ()<std::reference_wrapper<std::string>>(const Arg amp;) const' being compiled
with
[
Arg=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(718): message : see reference to function template instantiation 'testing::Matcher<const Element amp;> testing::internal::CastAndAppendTransform<const Element amp;>::operator ()<std::reference_wrapper<std::string>>(const Arg amp;) const' being compiled
with
[
Arg=std::reference_wrapper<std::string>
]
c:vcpkgincludegmockgmock-matchers.h(717): message : while compiling class template member function 'OutIter testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>::IterateOverTuple<Tuple,3>::operator ()(Func,const Tup amp;,OutIter) const'
with
[
OutIter=std::back_insert_iterator<MatcherVec>,
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>,
Tup=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>
]
c:vcpkgincludegmockgmock-matchers.h(711): message : see reference to function template instantiation 'OutIter testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>::IterateOverTuple<Tuple,3>::operator ()(Func,const Tup amp;,OutIter) const' being compiled
with
[
OutIter=std::back_insert_iterator<MatcherVec>,
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>,
Tup=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>
]
c:vcpkgincludegmockgmock-matchers.h(711): message : see reference to class template instantiation 'testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>::IterateOverTuple<Tuple,3>' being compiled
with
[
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>,
OutIter=std::back_insert_iterator<MatcherVec>
]
c:vcpkgincludegmockgmock-matchers.h(710): message : while compiling class template member function 'OutIter testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>::Run(Func,const Tuple amp;,OutIter)'
with
[
OutIter=std::back_insert_iterator<MatcherVec>,
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>
]
c:vcpkgincludegmockgmock-matchers.h(735): message : see reference to function template instantiation 'OutIter testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>::Run(Func,const Tuple amp;,OutIter)' being compiled
with
[
OutIter=std::back_insert_iterator<MatcherVec>,
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>
]
c:vcpkgincludegmockgmock-matchers.h(735): message : see reference to class template instantiation 'testing::internal::TransformTupleValuesHelper<Tuple,Func,OutIter>' being compiled
with
[
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>,
OutIter=std::back_insert_iterator<MatcherVec>
]
c:vcpkgincludegmockgmock-matchers.h(3574): message : see reference to function template instantiation 'OutIter testing::internal::TransformTupleValues<MatcherTuple,testing::internal::CastAndAppendTransform<const Element amp;>,std::back_insert_iterator<MatcherVec>>(Func,const Tuple amp;,OutIter)' being compiled
with
[
OutIter=std::back_insert_iterator<MatcherVec>,
MatcherTuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>,
Func=testing::internal::CastAndAppendTransform<const Element amp;>,
Tuple=std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>
]
c:vcpkgincludegmockgmock-matchers.h(368): message : see reference to function template instantiation 'testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>::operator testing::Matcher<const T amp;>(void) const<const Tamp;>' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(368): message : see reference to function template instantiation 'testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>::operator testing::Matcher<const T amp;>(void) const<const Tamp;>' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(352): message : see reference to function template instantiation 'testing::Matcher<const T amp;> testing::internal::MatcherCastImpl<const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>amp;,M>::CastImpl<false>(const M amp;,std::true_type,std::integral_constant<bool,false>)' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(350): message : see reference to function template instantiation 'testing::Matcher<const T amp;> testing::internal::MatcherCastImpl<const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>amp;,M>::CastImpl<false>(const M amp;,std::true_type,std::integral_constant<bool,false>)' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(336): message : while compiling class template member function 'testing::Matcher<const T amp;> testing::internal::MatcherCastImpl<const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>amp;,M>::Cast(const M amp;)'
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(510): message : see reference to function template instantiation 'testing::Matcher<const T amp;> testing::internal::MatcherCastImpl<const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>amp;,M>::Cast(const M amp;)' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(510): message : see reference to class template instantiation 'testing::internal::MatcherCastImpl<T,M>' being compiled
with
[
T=const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>> amp;,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(517): message : see reference to function template instantiation 'testing::Matcher<const T amp;> testing::MatcherCast<const std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>amp;,M>(const M amp;)' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:vcpkgincludegmockgmock-matchers.h(1534): message : see reference to function template instantiation 'testing::Matcher<const T amp;> testing::SafeMatcherCast<const Tamp;,M>(const M amp;)' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>,
M=testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>
]
c:codetest.cpp(94): message : see reference to function template instantiation 'testing::AssertionResult testing::internal::PredicateFormatterFromMatcher<testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>>::operator ()<std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>>(const char *,const T amp;) const' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>
]
c:codetest.cpp(94): message : see reference to function template instantiation 'testing::AssertionResult testing::internal::PredicateFormatterFromMatcher<testing::internal::ElementsAreMatcher<std::tuple<std::reference_wrapper<std::string>,std::reference_wrapper<std::string>,std::reference_wrapper<std::string>>>>::operator ()<std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>>(const char *,const T amp;) const' being compiled
with
[
T=std::vector<std::reference_wrapper<std::string>,std::allocator<std::reference_wrapper<std::string>>>
]
Комментарии:
1. Просто чтобы убедиться, что у вас
#include <functional>в коде все правильно?2.
std::reference_wrapperoperator==я полагаю, что ошибка не дает того, о чем говорит ошибка.3. Я явно добавил его, чтобы проверить, никакой разницы @NathanOliver
4. Более простое повторение:
std::string s; std::ref(s) == std::ref(s);5. Я не думаю, что это сильно изменится, но почему бы не сравнить элементы вектора непосредственно со строками?