exercise 9.31 (b)

ex9_31b.cpp

#include <iostream>
#include <list>

int main ()
{
     std::list <int> v1 = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

    auto curr = v1.begin();

    while (curr != v1.end()) {
        if (*curr % 2) {
            curr = v1.insert (curr, *curr);
            ++curr;
            ++curr;
        } else {
            curr = v1.erase (curr);
        }
    }

    for (auto it = v1.begin(); it != v1.end(); ++it)
        std::cout << *it << " ";

   return 0;  
}