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[iter] Add hb_iter_of_t<>

This commit is contained in:
Behdad Esfahbod 2019-01-02 16:43:52 -05:00
parent b5d6fe1a45
commit c9d8a07e30
1 changed files with 8 additions and 6 deletions
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14
src/hb-iter.hh
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@ -48,9 +48,11 @@
* Base classes for iterators.
*/
template <typename Item> struct hb_iter_of_t {};
/* Base class for all iterators. */
template <typename Iter, typename Item = typename Iter::__item_type__>
struct hb_iter_t
struct hb_iter_t : hb_iter_of_t<Item>
{
typedef Iter iter_t;
typedef Item item_t;
@ -161,11 +163,11 @@ struct hb_is_iterable { enum { value = _hb_is_iterable<T, hb_true_t>::value }; }
/* hb_is_iterator() / hb_is_sorted_iterator() */
template<typename Iter = void, typename Item = void> char _hb_is_iterator (...) {};
template<typename Iter, typename Item> int _hb_is_iterator (hb_iter_t<Iter, Item> *) {};
template<typename Iter, typename Item> int _hb_is_iterator (hb_iter_t<Iter, const Item> *) {};
template<typename Iter, typename Item> int _hb_is_iterator (hb_iter_t<Iter, Item&> *) {};
template<typename Iter, typename Item> int _hb_is_iterator (hb_iter_t<Iter, const Item&> *) {};
template<typename Item = void> char _hb_is_iterator (...) {};
template<typename Item> int _hb_is_iterator (hb_iter_of_t<Item> *) {};
template<typename Item> int _hb_is_iterator (hb_iter_of_t<const Item> *) {};
template<typename Item> int _hb_is_iterator (hb_iter_of_t<Item&> *) {};
template<typename Item> int _hb_is_iterator (hb_iter_of_t<const Item&> *) {};
static_assert (sizeof (char) != sizeof (int), "");
template<typename Iter, typename Item>
struct hb_is_iterator { enum {