Templates on templates

[rapidcoder]

Hello,

This works:

#include <vector>
template <typename U>
void doIt(const std::vector<U>& x) {
}

But this does not:

template <typename T, typename U>
void doIt(const T<U>& someCollection) {
 //...
}

error: 'T' is not a template

WTF?

[m4ster r0shi]

Try this:

#include <iostream>
#include <vector>
#include <list>
using namespace std;

template < template <class> class T, class U >
ostream & print(const T<U> & someCollection)
{
    typename T<U>::const_iterator it;

    it=someCollection.begin();

    while (it!=someCollection.end())
        cout << *it++ << ' ';

    return cout;
}

int main()
{
    vector<int> v;
    list<double> l;

    v.push_back(1); v.push_back(2);
    l.push_back(1.1); l.push_back(2.2);

    print(v) << endl;
    print(l) << endl;

    cin.get();
    return 0;
}

EDIT: Nice try though ;)

[rapidcoder]

Thanks.