Re: iterator error

From:

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

Newsgroups:

comp.lang.c++

Date:

Thu, 5 Apr 2007 21:14:39 -0400

Message-ID:

<NuidnYybSrxjA4jbnZ2dnUVZ_qiqnZ2d@comcast.com>

Ian Collins wrote:

?????????? 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"?

That all depends on what the type of a std::map<int, int>::iterator is
and whether it cam be initialised by or compared to an int. If it
lacks a public constructor, the assignment is illegal and if it lacks
an operator==(int), the comparison is illegal.

It's actually operator!=(int) we're discussing here... Unless you think
they are related somehow...

V
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