STL iterator: Assertion Error

Question

Why does the following code produce an assertion error: Expression: list iterators incompatible?

#include <list>
using namespace std;

int main()
{
    list<int> a;
    a.push_back(1);
    list<int>::iterator iter=a.begin();
    a.erase(iter);

    iter==a.end();
}

Answer 1

What you want to do is this:

#include <list>
using namespace std;

int main()
{
    list<int> a;
    a.push_back(1);
    list<int>::iterator iter=a.begin();
    iter = a.erase(iter);
}