[boost] Re: [review] hash functions

From: Daniel James (daniel_at_[hidden])
Date: 2005-03-10 16:34:23

JOAQUIN LOPEZ MU?Z wrote:
> 
> // we modify also range hashing
> 
> template<typename It>
> std::size_t hash_range(It first,It last,crypto_impl)
> {
>   std::size_t seed=0;
>   std::size_t n=1;
>   for(;first!=last;++first){
>     hash_combine(seed,*first,crypto_impl);
>     seed*=n; // for instance
>     n*=2;
>   }
>   return seed;
> }
> 
> unordered_set<my_type,boost::hash<my_type,crypto_impl> > us;
> 
> What do you think?

Unfortunately, you wouldn't be able to store a cryptographic hash 
function's state in a std::size_t.

Daniel