alarsyo/spot
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

* src/misc/hashfunc.hh (wang32_hash): New file and function,

Browse source 
extracted from...
* src/evtgba/product.cc (evtgba_product_state::hash): ... here.
* src/misc/Makefile.am (misc_HEADERS): Add hashfunc.hh.
This commit is contained in:
Alexandre Duret-Lutz 2004-11-16 14:59:49 +00:00
parent 49b871f924
commit dfb832cf20
4 changed files with 50 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

17
src/evtgba/product.cc
View file

@ -20,6 +20,7 @@
// 02111-1307, USA.
#include "product.hh"
#include "misc/hashfunc.hh"
#include "misc/modgray.hh"
#include <cstdlib>
#include <set>
@ -75,23 +76,9 @@ namespace spot
size_t
hash() const
{
// We assume that size_t has at least 32bits.
size_t res = 0;
for (int i = 0; i != n_; ++i)
{
size_t key = s_[i]->hash();
// Thomas Wang's 32 bit hash Function
// http://www.concentric.net/~Ttwang/tech/inthash.htm
key += ~(key << 15);
key ^= (key >> 10);
key += (key << 3);
key ^= (key >> 6);
key += ~(key << 11);
key ^= (key >> 16);
res ^= key;
}
res ^= wang32_hash(s_[i]->hash());
return res;
}