Re: [Boost-users] circular_buffer iterators

Subject: Re: [Boost-users] circular_buffer iterators
From: Bosko Markovic (boskoma_at_[hidden])
Date: 2010-09-22 04:44:02

Hi Jan,

According to your reply it seams that when using operator[] I must
also keep reading index updated, i.e. after operation like
push/pop/insert I also must change reading index accordingly so it
still points to old/correct element. It must be done manually, library
will not do that part of the job for me.
Thank you for your explanation.

Regards,
Bosko.

On Tue, Sep 21, 2010 at 12:17 AM, Bosko Markovic <boskoma_at_[hidden]> wrote:
> I have a simple use case for circular_buffer but I need a few advices.
> There is one producer and one consumer which only inspects elements
> and circular buffer will only be keeping history of last CB_SIZE
> elements.
> As far as I have understood there are two ways to access buffer
> elements, using indexes and operator[] or using iterators.
> I have chosen iterators.
> Since adding elements to buffer can invalidate iterators what is the
> proper way to check if they are still valid?
> Is it comparing it to .end() and .begin()?
>
> typedef boost::circular_buffer<data_type> CircularBuffer;
> CircularBuffer cb(CB_SIZE);
> CircularBuffer::iterator it = cb.begin();
> ...
> if( it >= cb.begin()  && it < cb.end() ){
>  cout << *it;
> }
>
> Regards,
> BoskoM.
>