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[iter] Fix hb_is_iterator_of() to actually check item type

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This commit is contained in:
Behdad Esfahbod 2019-04-26 13:16:48 -07:00
parent c51f15ddfc
commit 73c82f2301
1 changed files with 9 additions and 11 deletions
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20
src/hb-iter.hh
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@ -225,19 +225,17 @@ struct hb_is_iterable
/* hb_is_iterator() / hb_is_random_access_iterator() / hb_is_sorted_iterator() */
template <typename Iter>
struct _hb_is_iterator_of
{
char operator () (...) { return 0; }
template<typename Item> int operator () (hb_iter_t<Iter, Item> *) { return 0; }
template<typename Item> int operator () (hb_iter_t<Iter, const Item> *) { return 0; }
template<typename Item> int operator () (hb_iter_t<Iter, Item&> *) { return 0; }
template<typename Item> int operator () (hb_iter_t<Iter, const Item&> *) { return 0; }
static_assert (sizeof (char) != sizeof (int), "");
};
template <typename Iter, typename Item>
static inline char _hb_is_iterator_of (hb_priority<0>, const void *) { return 0; }
template <typename Iter,
typename Item,
typename Item2 = typename Iter::item_t,
hb_enable_if (hb_is_cr_convertible_to (Item2, Item))>
static inline int _hb_is_iterator_of (hb_priority<2>, hb_iter_t<Iter, Item2> *) { return 0; }
template<typename Iter, typename Item>
struct hb_is_iterator_of { enum {
value = sizeof (int) == sizeof (hb_declval (_hb_is_iterator_of<Iter>) (hb_declval (Iter*))) }; };
value = sizeof (int) == sizeof (_hb_is_iterator_of<Iter, Item> (hb_prioritize, hb_declval (Iter*))) }; };
#define hb_is_iterator_of(Iter, Item) hb_is_iterator_of<Iter, Item>::value
#define hb_is_iterator(Iter) hb_is_iterator_of (Iter, typename Iter::item_t)