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Add hb_static_size(T)

This commit is contained in:
Behdad Esfahbod 2018-11-24 00:25:40 -05:00
parent f99abcc379
commit 39b9d63b01
1 changed files with 19 additions and 0 deletions
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19
src/hb-null.hh
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@ -44,6 +44,7 @@
/* The hard way... /* The hard way...
* https://stackoverflow.com/questions/7776448/sfinae-tried-with-bool-gives-compiler-error-template-argument-tvalue-invol * https://stackoverflow.com/questions/7776448/sfinae-tried-with-bool-gives-compiler-error-template-argument-tvalue-invol
*/ */
template<bool> struct _hb_bool_type {}; template<bool> struct _hb_bool_type {};
template <typename T, typename B> template <typename T, typename B>
@ -58,6 +59,24 @@ struct hb_null_size
{ enum { value = _hb_null_size<T, _hb_bool_type<true> >::value }; }; { enum { value = _hb_null_size<T, _hb_bool_type<true> >::value }; };
#define hb_null_size(T) hb_null_size<T>::value #define hb_null_size(T) hb_null_size<T>::value
/* This doesn't belong here, but since is copy/paste from above, put it here. */
template <typename T, typename B>
struct _hb_static_size
{ enum { value = sizeof (T) }; };
template <typename T>
struct _hb_static_size<T, _hb_bool_type<(bool) (1 + (unsigned int) T::min_size)> >
{ enum { value = T::static_size }; };
template <typename T>
struct hb_static_size
{ enum { value = _hb_static_size<T, _hb_bool_type<true> >::value }; };
#define hb_static_size(T) hb_static_size<T>::value
/*
* Null()
*/
extern HB_INTERNAL extern HB_INTERNAL
hb_vector_size_impl_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (hb_vector_size_impl_t) - 1) / sizeof (hb_vector_size_impl_t)]; hb_vector_size_impl_t const _hb_NullPool[(HB_NULL_POOL_SIZE + sizeof (hb_vector_size_impl_t) - 1) / sizeof (hb_vector_size_impl_t)];