pub_soft/abseil-cpp
3
0
Fork 0
mirror of https://github.com/abseil/abseil-cpp.git synced 2026-06-04 20:14:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

Export of internal Abseil changes

Browse Source 
--
1f91ba7fcb79244fce1fe448c1d31fb5b0580584 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 343511158

--
8dcd61fed44f4e56044aa4a899cc3124117fa21f by Abseil Team <absl-team@google.com>:

refactors result_of so it doesn't unnecessarily break in C++20 mode

std::result_of was deprecated in C++17 and removed in C++20. This CL
adds an implementation detail so it transparently continues to work
when external users turn up to C++20 or later.

The implementation is derived from C++17's specification of result_of
[depr.meta.types][1].

[1]: https://timsong-cpp.github.io/cppwp/n4659/depr.meta.types

Fixes #649

PiperOrigin-RevId: 343395432
GitOrigin-RevId: 1f91ba7fcb79244fce1fe448c1d31fb5b0580584
Change-Id: Id5d9c55dc7547737bade48a15f2f5740f414d811
This commit is contained in:
Abseil Team
2020-11-20 09:52:55 -08:00
committed by Derek Mauro
parent 4fd9a1ec50
commit e19260fd7d
1 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
absl/meta/type_traits.h
View File

@@ -610,8 +610,22 @@ using common_type_t = typename std::common_type<T...>::type;
template <typename T>
using underlying_type_t = typename std::underlying_type<T>::type;
template <typename T>
using result_of_t = typename std::result_of<T>::type;
namespace type_traits_internal {
#if __cplusplus >= 201703L
// std::result_of is deprecated (C++17) or removed (C++20)
template<typename> struct result_of;
template<typename F, typename... Args>
struct result_of<F(Args...)> : std::invoke_result<F, Args...> {};
#else
template<typename F> using result_of = std::result_of<F>;
#endif
} // namespace type_traits_internal
template<typename F>
using result_of_t = typename type_traits_internal::result_of<F>::type;
namespace type_traits_internal {
// In MSVC we can't probe std::hash or stdext::hash because it triggers a