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#include <iostream>
 
template <typename T = char>
class smart_pointer
{
public:
	smart_pointer()          : pt (nullptr) {}
	smart_pointer(T *new_pt) : pt (new_pt)  {}
 
	      T& operator*()        { return *pt; }
	const T& operator*() const  { return *pt; }
 
private:
	T* pt;
};
 
int main()
{
	smart_pointer sp;
	smart_pointer<int> pi   = new int (42);
	smart_pointer<float> pf = new float (3.14f);
 
//	std::cout << sp << '\n';
	std::cout << *pi << '\n';
	std::cout << *pf << '\n';
}
 

prog.cpp:19:2: error: use of class template 'smart_pointer' requires template arguments
        smart_pointer sp;
        ^
prog.cpp:4:7: note: template is declared here
class smart_pointer
      ^
1 error generated.

Standard output is empty