Re: [boost] Re: static sized strings

From: Rob Stewart (stewart_at_[hidden])
Date: 2004-05-21 11:50:20

From: "Reece Dunn" <msclrhd_at_[hidden]>
> Rob Stewart wrote:
> 
> >I'm still missing something.  Why would you want a non-const mf
> >to return the const iterator type?
> 
> That was a typeo!
> 
> >    class char_string
> >    {
> >       virtual iterator begin() = 0;
> >       virtual const_iterator begin() const = 0;
> >    };
> 
> That is what I was referring to. You need to change the name of the const 
> version if you are to allow virtual functions.

Why?

> >case, because the const and non-const functions return different
> >types, you can't have the derived class implement a const
> >implementation function that the adaptor can use to provide both
> >const and non-const interface functions.  So what am I missing?
> 
> Nothing. You do indeed need two functions:
>    iterator iter_offset( difference_type );
>    const_iterator const_iter_offset( difference_type ) const;

Why?  This is perfectly valid C++:

   iterator iter_offset(different_type);
   const_iterator iter_offset(different_type) const;

So is there something in how you want to use them that precludes
your overloading them that way?

-- 
Rob Stewart                           stewart_at_[hidden]
Software Engineer                     http://www.sig.com
Susquehanna International Group, LLP  using std::disclaimer;