Re: getting crash when erasing last from vector

From:

=?Utf-8?B?QWxleA==?= <Alex@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.stl

Date:

Thu, 28 Feb 2008 03:23:01 -0800

Message-ID:

<98E92482-904E-4218-A72F-C9752647941F@microsoft.com>

Thanks Alex Blekhman.

Crash stopped.
But, It never go inside the if block. It always has odd numbers only.

I just want to iterate all the numbers (1 to 100). When even comes delete
from the vector using erase method. I just debugged it. It is skipping all
the even numbers. Where it is going wrong...

Thanks in advance.
--
Thanks & Regards,
Alex.

"Alex Blekhman" wrote:

"Alex" wrote:

Hi,

Please execute below code snippet.
#include "stdafx.h"
#include <vector>

using namespace std;

int main(int argc, char* argv[])
{
vector<int> MyIntVec;

for (int i = 1; i <= 100; ++ i)
{
MyIntVec.push_back(i);
}

int size = MyIntVec.size();

vector<int>::iterator MyIntVecItr;

for (MyIntVecItr = MyIntVec.begin(); MyIntVecItr !=
MyIntVec.end(); ++
MyIntVecItr)
{
if (((*MyIntVecItr) % 2) == 0)
{
MyIntVecItr = MyIntVec.erase(MyIntVecItr); //Crash Here
}
}

You increment the `MyIntVecItr' more than necessary. Replace your
code with:

    for (MyIntVecItr = MyIntVec.begin(); MyIntVecItr !=
MyIntVec.end();)
    {
        if (((*MyIntVecItr) % 2) == 0)
        {
            MyIntVecItr = MyIntVec.erase(MyIntVecItr); //Crash
Here
        }
        else
        {
            ++MyIntVecItr;
        }
    }

HTH
Alex

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