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[meta] Add hb_type_identity<> 

To block template argument deduction.
This commit is contained in:
Behdad Esfahbod 2019-04-26 17:14:25 -07:00
parent 8c8922a019
commit 750b65e9a9
1 changed files with 4 additions and 0 deletions
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4
src/hb-meta.hh
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@ -65,6 +65,9 @@ template <> struct hb_priority<0> {};
#define HB_FUNCOBJ(x) static_const x HB_UNUSED
template <typename T> struct hb_match_identity { typedef T type; };
template <typename T> using hb_type_identity = typename hb_match_identity<T>::type;
struct
{
template <typename T>
@ -96,6 +99,7 @@ template <typename T> struct hb_match_pointer<T *> { typedef T type; enum { valu
template <typename T> using hb_remove_pointer = typename hb_match_pointer<T>::type;
#define hb_is_pointer(T) hb_match_pointer<T>::value
/* TODO Add feature-parity to std::decay. */
template <typename T> using hb_decay = hb_remove_const<hb_remove_reference<T>>;
#define hb_is_cr_convertible_to(A, B) ( \