Question

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Can you remove elements from a std::list while iterating through it?

I want to erase items from the list while iterating over. I have done this before, but somehow this simple example fails me. thnx for the help in advance!

#include<iostream>
#include<list>
using namespace std;

void main()
{
    list<int> x;
    for ( int i =0;i<10; i++)
        x.push_back(i);

    for( list<int>::iterator k = x.begin(); k != x.end();k++)
        cout<<*k<<" ";

    cout<<endl;

    for( list<int>::iterator k = x.begin(); k != x.end();k++)
    {
        if ((*k)%2)
        {
            x.erase(k);
        }
    }

    cout<<endl;
    getchar();
}

Answer 1

erase returns the element after the erased element: http://www.cplusplus.com/reference/stl/vector/erase/

So try something like this:

for( list<int>::iterator k = x.begin(); k != x.end();)
  if( (*k)%2 )        
    k=x.erase(k);
  else
    ++k;