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| author | Rémi Verschelde <remi@verschelde.fr> | 2022-07-24 23:07:30 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-07-24 23:07:30 +0200 |
| commit | 72c2f7ef160f37fdd0b0412d9b329e6c7b67a721 (patch) | |
| tree | 5d1acde6740da9cd5ae636e4ba92fae54f63f329 /thirdparty/harfbuzz/src/hb-null.hh | |
| parent | 0d1dacc902904d6eedc74f9a0a04069e6111591d (diff) | |
| parent | 5f5a9f256cad866172c18939e31162ba038ac02e (diff) | |
Merge pull request #63404 from bruvzg/hb-501
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-null.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-null.hh | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/thirdparty/harfbuzz/src/hb-null.hh b/thirdparty/harfbuzz/src/hb-null.hh index 78eb6474d5..0d7f4da79e 100644 --- a/thirdparty/harfbuzz/src/hb-null.hh +++ b/thirdparty/harfbuzz/src/hb-null.hh @@ -39,6 +39,24 @@ #define HB_NULL_POOL_SIZE 448 +template <typename T, typename> +struct _hb_has_min_size : hb_false_type {}; +template <typename T> +struct _hb_has_min_size<T, hb_void_t<decltype (T::min_size)>> + : hb_true_type {}; +template <typename T> +using hb_has_min_size = _hb_has_min_size<T, void>; +#define hb_has_min_size(T) hb_has_min_size<T>::value + +template <typename T, typename> +struct _hb_has_null_size : hb_false_type {}; +template <typename T> +struct _hb_has_null_size<T, hb_void_t<decltype (T::null_size)>> + : hb_true_type {}; +template <typename T> +using hb_has_null_size = _hb_has_null_size<T, void>; +#define hb_has_null_size(T) hb_has_null_size<T>::value + /* Use SFINAE to sniff whether T has min_size; in which case return the larger * of sizeof(T) and T::null_size, otherwise return sizeof(T). * @@ -117,8 +135,19 @@ struct NullHelper }; \ namespace Namespace { \ static_assert (true, "") /* Require semicolon after. */ +#define DECLARE_NULL_NAMESPACE_BYTES_TEMPLATE1(Namespace, Type, Size) \ + } /* Close namespace. */ \ + extern HB_INTERNAL const unsigned char _hb_Null_##Namespace##_##Type[Size]; \ + template <typename Spec> \ + struct Null<Namespace::Type<Spec>> { \ + static Namespace::Type<Spec> const & get_null () { \ + return *reinterpret_cast<const Namespace::Type<Spec> *> (_hb_Null_##Namespace##_##Type); \ + } \ + }; \ + namespace Namespace { \ + static_assert (true, "") /* Require semicolon after. */ #define DEFINE_NULL_NAMESPACE_BYTES(Namespace, Type) \ - const unsigned char _hb_Null_##Namespace##_##Type[hb_null_size (Namespace::Type)] + const unsigned char _hb_Null_##Namespace##_##Type[sizeof (_hb_Null_##Namespace##_##Type)] /* Specializations for arbitrary-content Null objects expressed as struct initializer. */ #define DECLARE_NULL_INSTANCE(Type) \ |