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#include <iostream>
 
using namespace std;
 
template<typename T>
class Size{
    public:
        Size& operator()()const;
};
 
template<typename T>
Size<T>& Size<T>::operator()()const{
    return (*this);
}
 
int main() {
	Size<int> s;
    s();
	return 0;
}

prog.cpp: In instantiation of ‘Size<T>& Size<T>::operator()() const [with T = int]’:
prog.cpp:18:7:   required from here
prog.cpp:13:18: error: invalid initialization of reference of type ‘Size<int>&’ from expression of type ‘const Size<int>’
prog.cpp: In member function ‘Size<T>& Size<T>::operator()() const [with T = int]’:
prog.cpp:14:1: warning: control reaches end of non-void function [-Wreturn-type]

Standard output is empty