Function that takes an STL iterator over ANY container of a elements of a specific type

Question

How would I define a function that takes as input an iterator over any type of STL container, but only to those of a specific templated type. For example:

Any iterator o

Answer 1

You could use a SFINAE construct such as boost::enable_if which verifies if the nested typedef iterator::value_type is indeed of the appropriate type.

template
typename boost::enable_if >::type
    f(Iterator i)
{
    /* ... */
}

int main()
{
    std::list l;
    std::vector v;

    f(l.begin()); // OK
    f(v.begin()); // OK

    std::vector v2;
    f(v2.begin()); /* Illegal */
}

This is what I understand from "a function that takes as input an iterator over any type of STL container, but only to those of a specific templated type", but my interpretation might be wrong.