weird compile error

Code:

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template <class C, class T> int count2(const C &v, T val)
{
    C::const_iterator i = find(v.begin(), v.end(), val);
    int n = 0;
    while(i != v.end()) {
        ++n;
        ++i;
        i = find(i, v.end(), val);
    }
    return n;
}

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This functions counts the number of occurences of 'val' inside the type C.

What i dont understand is why do i get compile error for this that i is undeclared...

The problem that I see is that C::const_iterator is a name dependent on the template parameter C, hence it should be disambiguated with typename otherwise it would be assumed to be a member name instead of a type name, i.e.,

Code:

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typename C::const_iterator i = find(v.begin(), v.end(), val);

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Mind you, if this isn't merely an exercise, there's a std::count that already does what you want.