Re: [boost] [iterator] iterator_facade reference type problem

Subject: Re: [boost] [iterator] iterator_facade reference type problem
From: er (erwann.rogard_at_[hidden])
Date: 2010-01-14 07:47:59

Phil Endecott wrote:
> Dear All,
> 

> 
> But what do I do about the reference type?  I can't use std::pair<const 
> KEY,VALUE>& because I'm not storing the keys and values in that way.  
> It's almost possible to use std::pair<KEY,VALUE> for a const_iterator, 
> but not if you want to allow the user to change the value through the 
> reference.  

You are iterating over 2 vectors in parallel? Isn't that the job of 
zip_iterator? If you insist on using iterator_facade, my guess would be, 
since dereferencing creates a temporary, that iterator_facade::Reference 
must be explicitly Value, not Value& (the default).