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[iter] Add hb_len()

This commit is contained in:
Behdad Esfahbod 2019-08-31 12:44:24 -05:00
parent 875131d478
commit 398b296f3b
2 changed files with 9 additions and 1 deletions
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8
src/hb-iter.hh
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@ -175,6 +175,14 @@ struct
} }
HB_FUNCOBJ (hb_iter); HB_FUNCOBJ (hb_iter);
struct
{
template <typename T> unsigned
operator () (T&& c) const
{ return c.len (); }
}
HB_FUNCOBJ (hb_len);
/* Mixin to fill in what the subclass doesn't provide. */ /* Mixin to fill in what the subclass doesn't provide. */
template <typename iter_t, typename item_t = typename iter_t::__item_t__> template <typename iter_t, typename item_t = typename iter_t::__item_t__>

2
src/test-iter.cc
View File

@ -272,7 +272,7 @@ main (int argc, char **argv)
hb_repeat (7u); hb_repeat (7u);
hb_repeat (nullptr); hb_repeat (nullptr);
hb_repeat (vl); hb_repeat (vl);
assert ((hb_range (10) | hb_take (3)).len () == 3); assert (hb_len (hb_range (10) | hb_take (3)) == 3);
assert (hb_range (9).len () == 9); assert (hb_range (9).len () == 9);
assert (hb_range (2, 9).len () == 7); assert (hb_range (2, 9).len () == 7);
assert (hb_range (2, 9, 3).len () == 3); assert (hb_range (2, 9, 3).len () == 3);