#include <cstddef>

using namespace std;

template <typename T>
class UniquePtr {
private:
    T* obj;

public:
    // +
    explicit UniquePtr() {
        obj = nullptr;
    }
    // +
    explicit UniquePtr(T* link): obj(link) {
        link = nullptr;
    }
    // +
    UniquePtr(UniquePtr&& a) {
        obj = a.release();
    }
    // +
    UniquePtr& operator=(nullptr_t) {
        obj = nullptr;
        return *this;
    }
    // +
    UniquePtr& operator=(UniquePtr&& a) {
        obj = a.release();
        return *this;
    }
    // +
    T& operator* () {
        return *obj;
    }
    // +
    T& operator* () const {
        return *obj;
    }
    // +
    T* operator-> () {
        return obj;
    }
    // +
    T* operator-> () const {
        return obj;
    }
    // +
    T* release() {
        T* timeObj = obj;
        obj = nullptr;
        return timeObj;
    }
    // +
    void reset(T* ptr) {
        obj = ptr;
        ptr = nullptr;
    }
    // +
    void swap(UniquePtr& other) {
        T* timeObj = obj;
        obj = other.get();
        other.reset(timeObj);
    }
    // +
    T* get() const {
        return obj;
    }
    // +
    explicit operator bool() {
        return (obj != 0);
    }
    // +
    ~UniquePtr() {
        delete obj;
    }
};