#include <iostream>
#include <memory>

class Resource
{
public:     
	Resource() { std::cout << "Resource acquired\n"; }
	~Resource() { std::cout << "Resource deleted\n"; }
    void use() { std::cout<<"Resource use\n"; }
};

void test2(std::unique_ptr<Resource> res)
{
    std::cout<<"test2 using Resourse\n";
    res->use();
     std::cout<<"about to exit test2()\n";
} // smart pointer automatically deleted here

void test()
{
    // allocate memory from the heap: 
    auto res = std::make_unique<Resource>(); // One way
 	// std::unique_ptr<Resource> res{new Resource()}; // Another way
    std::cout<<"test using Resourse\n";
    res->use();
    // pass pointer to test2
    // test2(res); // error: use of deleted function ... <= there's no copy constructor for unique_ptr
    test2(std::move(res));
    // smart pointer already deleted in test2
    std::cout<<"about to exit test()\n";
}

int main()
{
    std::cout<<"calling test()\n";
    test();
    std::cout<<"returned from test()\n";
}