[boost] Re: [review] hash functions

From: Daniel James (daniel_at_[hidden])
Date: 2005-03-14 07:41:13

Daniel James wrote:
> If you use unordered_set<base*> then the hash 
> function will be called for the pointer, not the class. If you use 
> unordered_set<boost::shared_ptr<base> >, then it depends on how Peter 
> implements the hash function for shared_ptr, but I expect it will be the 
> pointer again.

It will have to be the pointer, since the key has to be const. Only a 
hash function for a 'deep-const' pointer will be able to use the pointee.