Receiving container as template argument

I want to iterate a container inside some template function.If container is deque but type it stores is not known then, I tried:

template <typename T>
void PrintDeque(deque<T> d)
{
    deque<T>::iterator it; //error here
    for(it=d.begin();it!=d.end();it++)
        cout<<*it<<" ";
    cout<<endl;
}

OR if I try this for unknown container:

template <typename T>
void PrintDeque(T d)
{
    T::iterator it;   //error here
    for(it=d.begin();it!=d.end();it++)
        cout<<*it<<" ";
    cout<<endl;
}

Both give compilation errors. How to create an iterator inside the template function so that I can iterate the container?

template <typename T>
void PrintDeque(T d)
{
    typename T::iterator it;   //error here
    for(it=d.begin();it!=d.end();it++)
        cout<<*it<<" ";
    cout<<endl;
}

You need typename before it because the compiler doesn't know you're naming a type, or a static variable. It's called a dependant type.

http://pages.cs.wisc.edu/~driscoll/typename.html

As an aside and to comment on the other answers. Some compilers don't need this, and some do. GCC is one of the compilers that do need this clarification.