Re: How to write previous element in STL list

From:

Victor Bazarov <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Mon, 27 Jul 2009 11:55:45 -0400

Message-ID:

<h4kim1$1vp$1@news.datemas.de>

Pascal J. Bourguignon wrote:

cornelis van der bent <kees.van.der.bent@gmail.com> writes:

In my code I want to go through all combinations of two items in a
list. Here is my code:

list<Instance*>::iterator i;
for (i = instances.begin(); i != --instances.end(); i++)

.. ^^^^

    {
        list<Instance*>::iterator j;
        for (j = i + 1; j < instances.end(); j++)

.. ^^^^

        {
            // Do something!
        }
    }

I get a big error message at i + 1. I got a similar message when I
wrote
i != instances.end() -1, but fixed this by writing --instances.end().

My question what must I write instead of i + 1?

j=i; j++; seems to work.

.. ^^^

Advice: prefer pre-increment over post-increment *for iterators*.

V
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