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[set] Cache length in iterator

This commit is contained in:
Behdad Esfahbod 2018-12-22 11:11:10 -05:00
parent d0a706c7fd
commit f88fed5cd8
1 changed files with 5 additions and 2 deletions
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7
src/hb-set.hh
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@ -673,17 +673,20 @@ struct hb_set_t
*/ */
struct iter_t : hb_sorted_iter_t<iter_t, hb_codepoint_t> struct iter_t : hb_sorted_iter_t<iter_t, hb_codepoint_t>
{ {
iter_t (const hb_set_t &s_) : s (s_), v (INVALID) { __next__ (); } iter_t (const hb_set_t &s_) :
s (s_), v (INVALID), l (s.get_population () + 1) { __next__ (); }
typedef hb_codepoint_t __item_type__; typedef hb_codepoint_t __item_type__;
hb_codepoint_t __item__ () const { return v; } hb_codepoint_t __item__ () const { return v; }
bool __more__ () const { return v != INVALID; } bool __more__ () const { return v != INVALID; }
void __next__ () { s.next (&v); } void __next__ () { s.next (&v); if (l) l--; }
void __prev__ () { s.previous (&v); } void __prev__ () { s.previous (&v); }
unsigned __len__ () { return l; }
protected: protected:
const hb_set_t &s; const hb_set_t &s;
hb_codepoint_t v; hb_codepoint_t v;
unsigned l;
}; };
iter_t iter () { return iter_t (*this); } iter_t iter () { return iter_t (*this); }
operator iter_t () { return iter (); } operator iter_t () { return iter (); }