built-in string hash ?

[Pelle]

On 08/28/2010 10:25 PM, bearophile wrote:
> torhu:
>> string a = "abc";
>> auto hash = typeid(a).getHash(&a);
>
> If higher performance is necessary, you may pre-compute part of that:
>
> void main() {
>      string a = "abc";
>      auto hash1 = typeid(a).getHash(&a);
>      auto stringHash =&(typeid(a).getHash);
>      auto hash2 = stringHash(&a);
>      assert(hash1 == hash2);
> }
>
> Bye,
> bearophile

I doubt that gives any performance gains. typeid(a).getHash should be a 
constant expression anyway, and I don't see any gains in my tiny 
benchmark test.

Perhaps it works better if a was an Object, since typeid for objects 
does more.