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Workaround for Visual C++ error C2039 with std::tuple_element_t.

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Fixes #3931

PiperOrigin-RevId: 480659507
Change-Id: I6fabef63b1285189a06375227273d9de2456e37a
This commit is contained in:
Abseil Team 2022-10-12 10:30:15 -07:00 committed by Copybara-Service
parent d9bb8412d6
commit d29b143bda
2 changed files with 15 additions and 4 deletions
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12
googlemock/include/gmock/gmock-actions.h
View File

@ -1428,8 +1428,10 @@ struct WithArgsAction {
// MSVC complains about the I parameter pack not being
// expanded (error C3520) despite it being expanded in the
// type alias.
OnceAction<R(typename std::tuple_element<
I, std::tuple<Args...>>::type...)>>::value,
// TupleElement is also an MSVC workaround.
// See its definition for details.
OnceAction<R(internal::TupleElement<
I, std::tuple<Args...>>...)>>::value,
int>::type = 0>
operator OnceAction<R(Args...)>() && { // NOLINT
struct OA {
@ -1453,8 +1455,10 @@ struct WithArgsAction {
// MSVC complains about the I parameter pack not being
// expanded (error C3520) despite it being expanded in the
// type alias.
Action<R(typename std::tuple_element<
I, std::tuple<Args...>>::type...)>>::value,
// TupleElement is also an MSVC workaround.
// See its definition for details.
Action<R(internal::TupleElement<
I, std::tuple<Args...>>...)>>::value,
int>::type = 0>
operator Action<R(Args...)>() const { // NOLINT
Action<InnerSignature<R, Args...>> converted(inner_action);

7
googlemock/include/gmock/internal/gmock-internal-utils.h
View File

@ -453,6 +453,13 @@ struct Function<R(Args...)> {
template <typename R, typename... Args>
constexpr size_t Function<R(Args...)>::ArgumentCount;
// Workaround for MSVC error C2039: 'type': is not a member of 'std'
// when std::tuple_element is used.
// See: https://github.com/google/googletest/issues/3931
// Can be replaced with std::tuple_element_t in C++14.
template <size_t I, typename T>
using TupleElement = typename std::tuple_element<I, T>::type;
bool Base64Unescape(const std::string& encoded, std::string* decoded);
#ifdef _MSC_VER