#include "stdafx.h"

int _tmain(int argc, _TCHAR* argv[])
{
    string s = "Haven't got an idea why.";
    auto beg =  s.begin();
    auto end = s.end();
    while (beg < end)
    {
        cout << *beg << '\n';
        if (*beg == 'a')
        {//whithout if construct it works perfectly
            beg = s.erase(beg);
        }
        ++beg;
    }
    return 0;
}

Why if I erase one or more chars from this string this code breaks? I suppose it has something to do with returned iterator after erase operation being created at higher address than end iterator but I'm not sure and it surely isn't right behaviour. Or is it?