#include <iostream>
#include <type_traits>
void g(int&) { std::cout << 'L'; }
void g(int&&) { std::cout << 'R'; }
template<typename T>
void f(T&& t) {
if (std::is_same_v<T, int>) { std::cout << 1; }
if (std::is_same_v<T, int&>) { std::cout << 2; }
if (std::is_same_v<T, int&&>) { std::cout << 3; }
g(std::forward<T>(t));
}
int main() {
f(42);
int i = 0;
f(i);
}
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