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[map] Speed up copy-constructor

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This commit is contained in:
Behdad Esfahbod 2023-11-10 14:36:37 -07:00
parent e7879d6c55
commit d46cd93b6a
1 changed files with 23 additions and 1 deletions
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24
src/hb-map.hh
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@ -47,7 +47,29 @@ struct hb_hashmap_t
hb_hashmap_t () { init (); }
~hb_hashmap_t () { fini (); }
hb_hashmap_t (const hb_hashmap_t& o) : hb_hashmap_t () { alloc (o.population); hb_copy (o, *this); }
hb_hashmap_t (const hb_hashmap_t& o) : hb_hashmap_t ()
{
if (unlikely (!o.mask)) return;
if (item_t::is_trivial)
{
items = (item_t *) hb_malloc (sizeof (item_t) * (o.mask + 1));
if (unlikely (!items))
{
successful = false;
return;
}
population = o.population;
occupancy = o.occupancy;
mask = o.mask;
prime = o.prime;
max_chain_length = o.max_chain_length;
memcpy (items, o.items, sizeof (item_t) * (mask + 1));
return;
}
alloc (o.population); hb_copy (o, *this);
}
hb_hashmap_t (hb_hashmap_t&& o) : hb_hashmap_t () { hb_swap (*this, o); }
hb_hashmap_t& operator= (const hb_hashmap_t& o) { reset (); alloc (o.population); hb_copy (o, *this); return *this; }
hb_hashmap_t& operator= (hb_hashmap_t&& o) { hb_swap (*this, o); return *this; }