Re: hash_map not reporting true size when used with hash_comp
"Nilesh" <email@example.com> wrote in message
I have observed that when we use the hash_comp and define our own
comparison function, hash_map::size() always reports the size of 1,
doesn't matter how many elements we add in the map. We have to use the
hash_comp with user defined comparison function to use the key as
This just means your comparison function makes all keys compare equal to
each other, so only one is ever stored.
bool operator()(int i1, int i2) const
return true ;
return false ;
typedef hash_map<int, int, hash_compare<int, eqint>> MYHMAP2;
The second parameter of hash_compare should be a "less than" comparator,
not an "equals to" one.
With best wishes,
With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925
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