Re: iterator error

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Thu, 5 Apr 2007 21:02:56 -0400

Message-ID:

<1sKdnXXgisTcAYjbnZ2dnUVZ_tmknZ2d@comcast.com>

?????????? wrote:

windows xp, visual studio 2005
----------------------------------------------------------------------------------------------------------------------------------
#include <iostream>
#include <map>
using namespace std;

int main()
{
map<int, int>::iterator it = 0;
if( it != 0 ) //break point,
this is an run time error?
cout<<"ok!";
}
----------------------------------------------------------------------------------------------------------------------------------
why it can be assign "0", but can't compare with "0"?

The iterator type in 'map' is implementation-defined. What
it means to initialise it with (int)0 is implementation-defined.
Why operator != (int)0 doesn't work is (you guessed it!)
implementation-defined. You need to either look at the code
in the debugger to see what's going on or ask in the newsgroup
dedicated to your implementation (microsoft.public.vc.* family
of newsgroups come to mind).

V
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