dev-cpp-users

[Dev-C++] for_each

[Erik S. <esc...@gm...>]

what happens if, when a running for_each, you need to change the  
iterators that you originally passed, from within the function that  
you call?

specifically, what if the list changes size?

Re: [Dev-C++] for_each

[<au...@gm...>]

Hi,

> what happens if, when a running for_each, you need to change the  
> iterators that you originally passed, from within the function that  
> you call?
> 
> specifically, what if the list changes size?

If you add or remove elements from the list, all iterators become 
invalid. Of course you can try using them and you might succeed, but 
shouldn't do that. Just think that after any insertion or removal all 
iterator don't work anymore.

-- 
Aurimas

Re: [Dev-C++] for_each

[Cromwell E. <sp...@ya...>]

--- Aurimas Černius wrote:
> Hi,

Hello!

> > what happens if, when a running for_each, you
> > need to change the iterators that you originally
> > passed, from within the function that you call?
> > 
> > specifically, what if the list changes size?
> 
> If you add or remove elements from the list, all
> iterators become invalid. Of course you can try
> using them and you might succeed, but shouldn't
> do that. Just think that after any insertion or
> removal all iterator don't work anymore.

Only for certain containers (i.e. std::vector).  For
std::list or std::set only the iterator pointing to
the element just removed becomes invalid.

                              Cromwell D. Enage


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