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Use std::void_t when available

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This commit is contained in:
Denis Blank 2018-03-12 13:33:44 +01:00
parent 0e4b299b45
commit 084937e192
2 changed files with 12 additions and 1 deletions
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7
include/continuable/detail/features.hpp
View File

@ -55,6 +55,7 @@
#define CONTINUABLE_HAS_CXX17_CONSTEXPR_IF #define CONTINUABLE_HAS_CXX17_CONSTEXPR_IF
#define CONTINUABLE_HAS_CXX17_DISJUNCTION #define CONTINUABLE_HAS_CXX17_DISJUNCTION
#define CONTINUABLE_HAS_CXX17_CONJUNCTION #define CONTINUABLE_HAS_CXX17_CONJUNCTION
#define CONTINUABLE_HAS_CXX17_VOID_T
#else #else
// Generic feature detection based on __has_feature // Generic feature detection based on __has_feature
#if defined(__has_feature) #if defined(__has_feature)
@ -75,6 +76,12 @@
(__cpp_lib_experimental_logical_traits >= 201511) (__cpp_lib_experimental_logical_traits >= 201511)
#define CONTINUABLE_HAS_CXX17_CONJUNCTION #define CONTINUABLE_HAS_CXX17_CONJUNCTION
#endif #endif
#if !defined(CONTINUABLE_HAS_CXX17_VOID_T) && \
defined(__cpp_lib_void_t) && \
(__cpp_lib_void_t >= 201411)
#define CONTINUABLE_HAS_CXX17_VOID_T
#endif
#endif #endif
/// Usually this is enabled by the CMake project /// Usually this is enabled by the CMake project

4
include/continuable/detail/traits.hpp
View File

@ -90,6 +90,9 @@ constexpr auto get(identity<T...>) noexcept {
return identify<at_t<I, T...>>{}; return identify<at_t<I, T...>>{};
} }
#if defined(CONTINUABLE_HAS_CXX17_VOID_T)
using std::void_t;
#else
namespace detail { namespace detail {
// Equivalent to C++17's std::void_t which targets a bug in GCC, // Equivalent to C++17's std::void_t which targets a bug in GCC,
// that prevents correct SFINAE behavior. // that prevents correct SFINAE behavior.
@ -101,6 +104,7 @@ struct deduce_to_void : std::common_type<void> {};
/// C++17 like void_t type /// C++17 like void_t type
template <typename... T> template <typename... T>
using void_t = typename detail::deduce_to_void<T...>::type; using void_t = typename detail::deduce_to_void<T...>::type;
#endif // CONTINUABLE_HAS_CXX17_VOID_T
namespace detail { namespace detail {
template <typename Type, typename TrueCallback> template <typename Type, typename TrueCallback>