Re: Vector erase dumps core when vector size is 2

From:
Mark P <usenet@fall2005REMOVE.fastmailCAPS.fm>
Newsgroups:
comp.lang.c++
Date:
Wed, 05 Dec 2007 15:13:04 -0800
Message-ID:
<5gG5j.3356$NY.744@nlpi068.nbdc.sbc.com>
Anil wrote:

I am facing problem while erasing an elemet from stl vector when its
size is 2. It works fine when SIZE > 2.
Can anybody help me in this?? Following is the sample code which i
tried.

#include <iostream>
#include <vector>

using namespace std;
#define SIZE 2
main()
{
   vector<int> myVect;
   std::vector<int>::iterator iter;

   for(int i =0; i<SIZE; i++)
    myVect.push_back(i);

   cout<< myVect.size() << "\n";
   for( iter = myVect.begin(); iter != myVect.end(); iter++)
      cout<< *iter << " ";

   cout<<"\n";

   for( iter = myVect.begin(); iter != myVect.end(); iter++)
   {
      cout<< *iter << "\n";
     if( *iter == 1)
         myVect.erase(iter);

   }

return 0;
}


Calling erase invalidates any iterators pointing at or after the erased
element. The canonical way to do this is, rather than ++iter in the loop:

iter = myVect.erase(iter);

Read footnote 5 here: http://www.sgi.com/tech/stl/Vector.html#5
Read about erase here: http://www.sgi.com/tech/stl/Sequence.html

-Mark

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