Thanks very much for all of your comments about hash_map and various
issues around it.
Can someone suggest a good string hash function for a string of length
ranging from 7 to 13?
This one works well for me:
size_t hash(char const* p)
size_t r = 0;
// 31 is an empirical value obtained from hashing real logins
// 6291469 buckets
// 4142516 logins
// 894278 collisions
// 8 max bucket size
r = r * 31 + *p;
I googled and found a webpage
(GeneralHashFunctions) of Arash Partow (http://www.partow.net) on which
there are a number of hash functions. I copied them below. I am not
sure which one is good for my case.
Can you profile it for your particular application to see which one
suits you needs best?
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