Added a definition of hash_value_type and use that as the return type of the hash function. This was done to allow other functions to know what the return type of the hash function will be.
Added a definition of hash_value_type and use that as the return type of the hash function. This was done to allow other functions to know what the return type of the hash function will be.

gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf,gpuopenanalytics/libgdf