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[meta] void_tt -> void_t

This commit is contained in:
Behdad Esfahbod 2019-05-10 20:43:51 -07:00
parent 7df3ecfb40
commit caa3f92e91
1 changed files with 4 additions and 5 deletions
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9
src/hb-meta.hh
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@ -37,10 +37,9 @@
/* Void! For when we need a expression-type of void. */ /* Void! For when we need a expression-type of void. */
struct hb_empty_t {}; struct hb_empty_t {};
/* Void meta-function ala std::void_t /* https://en.cppreference.com/w/cpp/types/void_t */
* https://en.cppreference.com/w/cpp/types/void_t */ template<typename... Ts> struct _hb_void_t { typedef void type; };
template<typename... Ts> struct _hb_void_tt { typedef void type; }; template<typename... Ts> using hb_void_t = typename _hb_void_t<Ts...>::type;
template<typename... Ts> using hb_void_tt = typename _hb_void_tt<Ts...>::type;
template<typename Head, typename... Ts> struct _hb_head_tt { typedef Head type; }; template<typename Head, typename... Ts> struct _hb_head_tt { typedef Head type; };
template<typename... Ts> using hb_head_tt = typename _hb_head_tt<Ts...>::type; template<typename... Ts> using hb_head_tt = typename _hb_head_tt<Ts...>::type;
@ -67,7 +66,7 @@ template <typename T> struct hb_is_same<T, T> : hb_true_type {};
#define HB_RETURN(Ret, E) -> hb_head_tt<Ret, decltype ((E))> { return (E); } #define HB_RETURN(Ret, E) -> hb_head_tt<Ret, decltype ((E))> { return (E); }
#define HB_AUTO_RETURN(E) -> decltype ((E)) { return (E); } #define HB_AUTO_RETURN(E) -> decltype ((E)) { return (E); }
#define HB_VOID_RETURN(E) -> hb_void_tt<decltype ((E))> { (E); } #define HB_VOID_RETURN(E) -> hb_void_t<decltype ((E))> { (E); }
template <unsigned Pri> struct hb_priority : hb_priority<Pri - 1> {}; template <unsigned Pri> struct hb_priority : hb_priority<Pri - 1> {};
template <> struct hb_priority<0> {}; template <> struct hb_priority<0> {};