// unique_ptr is built-in RAII.
//
// A unique_ptr “owns” the pointed-to object.
// When the unique_ptr is destroyed (usually, by falling out of scope)
// then the pointed-to objected is destroyed, as well.
//
// You cannot assign a unique_ptr, because, then, there wouldn’t
// be a unique owner.
//
// BTW, auto_ptr is deprecated.

#include <iostream>
#include <memory>

using namespace std;

// A class that tells you when instances are created or destroyed:
class Loud {
  public:
    Loud() { clog << "Loud::Loud()\n"; }
    ~Loud() { clog << "Loud::~Loud()\n"; }
    void say() { clog << "Loud::say()\n"; }
};

void foo() {
    unique_ptr<Loud> p(new Loud);
    p->say();
}

int main() {
    unique_ptr<Loud[]> a(new Loud[3]);		// Note the []
    a[2].say();
    // When this function exits (via normal exit or throw),
    // then p gets destroyed, and its dtor deallocates the Loud.
    cout << "Calling foo()\n";
    foo();
    cout << "Back from foo()\n";
    return 0;
}