Re: [Boost-users] boost::iterator_facade and assignment operation

Subject: Re: [Boost-users] boost::iterator_facade and assignment operation
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-10-12 10:38:36

on Wed Oct 12 2011, Arun Ramasamy <aramasamy-AT-thevisualmd.com> wrote:

> HI,
> I'm using the boost iterator_facade class to implement a random
> access iterator for my class. When I try to assign the iterators to
> one another, the compiler fails saying
>
> 'operator =' function is unavailable".
>
> Sample code from my implementation below:
>
> class MyClass{
>     class Iterator : public boost::iterator_facade<Iterator, T,
> boost::bidirectional_traversal_tag>{         protected:
>         void increment();
>         bool equal(const Iterator& rhs)const; //etc
>         //... Note - no method implemented to support assignment
>     }
> }
>
> I'd assumed that it'll be possible to assign iterators to each other.
> Why is the assignment operator not supported by iterator_facade. 

It is.  My first guess is that you have added a data member with a
private operator=, but there isn't enough information in your post to be
sure.  I suggest you:

a) reduce the problem to a *minimal* example that demonstrates the
   problem.

b) post the example and the *full* error message here.

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com