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Fix "typename outside template" issues 

Nothing an extra template class wouldn't fix...

Fixes https://github.com/harfbuzz/harfbuzz/issues/1419
This commit is contained in:
Behdad Esfahbod 2018-11-29 12:18:14 -05:00
parent dc41ecef85
commit 282ce7230b
1 changed files with 19 additions and 6 deletions
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25
src/hb-null.hh
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@ -77,6 +77,7 @@ struct hb_static_size
/*
* Null()
*/
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)];
@ -86,7 +87,13 @@ static inline Type const & Null (void) {
static_assert (hb_null_size (Type) <= HB_NULL_POOL_SIZE, "Increase HB_NULL_POOL_SIZE.");
return *reinterpret_cast<Type const *> (_hb_NullPool);
}
#define Null(Type) Null<typename hb_remove_const (typename hb_remove_reference (Type))> ()
template <typename QType>
struct NullHelper
{
typedef typename hb_remove_const (typename hb_remove_reference (QType)) Type;
static inline const Type & get_null (void) { return Null<Type> (); }
};
#define Null(Type) NullHelper<Type>::get_null ()
/* Specializations for arbitrary-content Null objects expressed in bytes. */
#define DECLARE_NULL_NAMESPACE_BYTES(Namespace, Type) \
@ -129,17 +136,23 @@ static inline Type& Crap (void) {
memcpy (obj, &Null(Type), sizeof (*obj));
return *obj;
}
#define Crap(Type) Crap<typename hb_remove_const (typename hb_remove_reference (Type))> ()
template <typename QType>
struct CrapHelper
{
typedef typename hb_remove_const (typename hb_remove_reference (QType)) Type;
static inline Type & get_crap (void) { return Crap<Type> (); }
};
#define Crap(Type) CrapHelper<Type>::get_crap ()
template <typename Type>
struct CrapOrNull {
struct CrapOrNullHelper {
static inline Type & get (void) { return Crap(Type); }
};
template <typename Type>
struct CrapOrNull<const Type> {
static inline Type const & get (void) { return Null(Type); }
struct CrapOrNullHelper<const Type> {
static inline const Type & get (void) { return Null(Type); }
};
#define CrapOrNull(Type) CrapOrNull<Type>::get ()
#define CrapOrNull(Type) CrapOrNullHelper<Type>::get ()
/*