Re: [Boost-users] [foreach] BOOST_FOREACH question...

Subject: Re: [Boost-users] [foreach] BOOST_FOREACH question...
From: barcaroller (barcaroller_at_[hidden])
Date: 2010-01-07 21:40:16

"Dmitry Vinogradov" <sraider_at_[hidden]> wrote:

> To be short: it's not necessary.
>
> BTW, begin() and end() for an empty list are valid. You can't dereference
> them, but they are valid. So one can use them for comparison. And
> BOOST_FOREACH does.

I've had problems with standard 'for' loops when using empty containers:

    for (i = mylist.begin() ; i != mylist.end() ; i++)

By problems I mean core-dumps, memory leaks, etc.  These problems went away
when I used a size check:

    if (!mylist.empty())
        for (i = mylist.begin() ; i != mylist.end() ; i++)

This leads me to believe that begin() and end() are not valid, or is there
another way to explain this?