[Issue 2922] Egregiously bad hashing performance with strings

Fri Oct 23 08:59:23 PDT 2009

http://d.puremagic.com/issues/show_bug.cgi?id=2922

David Simcha <dsimcha at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |
           Severity|normal                      |major

--- Comment #3 from David Simcha <dsimcha at yahoo.com> 2009-10-23 08:59:22 PDT ---
I just realized that this was only fixed for string, i.e. immutable(char)[]. 
It still happens on const(char)[].  To demonstrate this, change the line

hash_t hash = typeid(string).getHash(cast(void*) &myRandString);

to

hash_t hash = typeid(const(char)[]).getHash(cast(void*) &myRandString);

in my test program.

When the typeid is changed to const(char)[], the results are exactly the same
as they were for string before this bug was fixed.

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