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use simplified void_t for all compilers other than gcc 4.x (#2160)

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Alexey Ochapov 2021-03-03 01:42:27 +03:00 committed by GitHub
parent 835b910e7d
commit d8b9254301
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1 changed files with 4 additions and 0 deletions
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4
include/fmt/core.h
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@ -1379,10 +1379,14 @@ template <typename T> struct formattable : std::false_type {};
namespace detail { namespace detail {
#if FMT_GCC_VERSION && FMT_GCC_VERSION < 500
// A workaround for gcc 4.8 to make void_t work in a SFINAE context. // A workaround for gcc 4.8 to make void_t work in a SFINAE context.
template <typename... Ts> struct void_t_impl { using type = void; }; template <typename... Ts> struct void_t_impl { using type = void; };
template <typename... Ts> template <typename... Ts>
using void_t = typename detail::void_t_impl<Ts...>::type; using void_t = typename detail::void_t_impl<Ts...>::type;
#else
template <typename...> using void_t = void;
#endif
template <typename It, typename T, typename Enable = void> template <typename It, typename T, typename Enable = void>
struct is_output_iterator : std::false_type {}; struct is_output_iterator : std::false_type {};