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Calculates a hash value for the given key.
template<class ARG_KEY>
AFX_INLINE UINT AFXAPI HashKey(
ARG_KEY key
);
Parameters
ARG_KEY
Template parameter specifying the data type used to access map keys.key
The key whose hash value is to be calculated.
Return Value
The key's hash value.
Remarks
This function is called directly by CMap::RemoveKey and indirectly by CMap::Lookup and CMap::Operator [].
The default implementation creates a hash value by shifting key right by four positions. Override this function so that it returns hash values appropriate for your application.
Example
template <> UINT AFXAPI HashKey(unsigned __int64 key)
{
// Generate the hash value by XORing the lower 32 bits of the number
// with the upper 32 bits
return(UINT(key) ^ UINT(key >> 32));
}
Requirements
Header: afxtempl.h