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#include <iostream>
#include <vector>
#include <list>
 
template<typename Iterator>
struct f {
	void operator()(Iterator beg, Iterator end)
	{
	    for(auto it = beg; it != end; it = std::next(it))
	    {
	        std::cout << *it << " iterator!" << std::endl;
	    }
	}
};
 
template<typename T>
struct f<typename std::vector<T>::iterator> {
	using Iterator = std::vector<T>::iterator;
 
	void operator()(Iterator beg, Iterator end)
	{
	    for(auto it = beg; it != end; it = std::next(it))
	    {
	        std::cout << *it << " vector!" << std::endl;
	    }
	}
};
 
int main()
{
    std::list<int> x = {1,2,3};
    std::cout << "List" << std::endl;
    f(x.begin(), x.end());
 
    std::cout << "Vector" << std::endl;
    std::vector<int> v = {1,2,3};
    f(v.begin(), v.end());
}

prog.cpp:17:8: error: template parameters not deducible in partial specialization:
 struct f<typename std::vector<T>::iterator> {
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.cpp:17:8: note:         ‘T’
prog.cpp: In function ‘int main()’:
prog.cpp:33:6: error: missing template arguments before ‘(’ token
     f(x.begin(), x.end());
      ^
prog.cpp:37:6: error: missing template arguments before ‘(’ token
     f(v.begin(), v.end());
      ^

Standard output is empty