iterator_adaptors dereference() ?

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2002-01-11 04:51:51

Should'nt the dereference() in the policies return a const_reference 
instead of a reference ?

I'm using a projection_iterator to navigate over a sequence and my 
UnaryFunction returns a const reference. This results in a compiler 
error (gcc-3.0.3).

Particular in the case of the projection_iterator, the 'function' is a 
one way function (able to convert the  real content to the iterator's 
value_type and not vice-versa, thus the iterator can never be writeable)
and thus only a 'dereference() const' is possible returning a 
const_reference IMHO ?