------- Comment #1 from pinskia at gmail dot com 2010-07-06 14:40 -------
Subject: Re: New: bug in STL iterator class
On Jul 6, 2010, at 7:21 AM, "andre dot bergner dot 0 at googlemail dot
com" <gcc-bugzi...@gcc.gnu.org> wrote:
> This is not a compiler bug, but a bug in the STL iterator class.
> The less-than-operator does not work properly.
> The following program can reproduce the bug.
>
> # include <iostream>
> # include <vector>
> using namespace std;
>
> main() {
> vector<int> v;
> vector<int>::iterator i = v.begin();
> --i;
I think the behavior is undefined because now i is not inside the
vector at all. In fact I think doing --i on an iterator at the
begining is undefined.
> cout << ( i - v.begin() ) << endl; // output: -1
> cout << ( i < v.begin() ) << endl; // output: 0 !!! SHOULD BE
> 1 !!!
> cout << ( i - v.begin() < 0) << endl; // output: 1 this one is
> correct
> }
>
>
> --
> Summary: bug in STL iterator class
> Product: gcc
> Version: unknown
> Status: UNCONFIRMED
> Severity: normal
> Priority: P3
> Component: c++
> AssignedTo: unassigned at gcc dot gnu dot org
> ReportedBy: andre dot bergner dot 0 at googlemail dot com
> GCC build triplet: -
> GCC host triplet: -
> GCC target triplet: -
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44840
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44840
