Test copyable vs movable arguments for overloaded functions

copy_vs_move_test.cpp

#include <type_traits>
#include <iostream>
using namespace std;

// must be used for movable arguments only
void f(int&& x) {
    using X = decltype(x);
    cout << __PRETTY_FUNCTION__ << ' ' << std::is_rvalue_reference<X>::value << endl;
}

// must be used for copyable arguments only
void f(const int& x) {
    using X = decltype(x);
    cout << __PRETTY_FUNCTION__ << ' ' << std::is_rvalue_reference<X>::value << endl;
}

int main() {
    int i = 2;
    int& iref = i;
    const int& const_iref = i;

    f(4);
    f(4 + 2);

    f(i);
    f(std::move(i));

    f(iref);
    f(std::move(iref));

    f(const_iref);
    f(std::move(const_iref));

    return 0;
}