#include <cassert>
#include <iostream>
#include <memory>
#include <utility>

int category(int&) { return 1; }
int category(int&&) { return 2; }

int main() {
    int n = 5;
    int&& r = std::move(n);
    assert(category(r) == 1);
    assert(category(std::move(r)) == 2);
    assert(n == 5);
    std::unique_ptr<int> source(new int(42));
    int* original = source.get();
    std::unique_ptr<int> target = std::move(source);
    assert(!source);
    assert(target.get() == original && *target == 42);
    std::cout << category(r) << ' ' << category(std::move(r)) << ' ' << *target << '\n';
}