p4.cpp

//
// Created by rudri on 10/11/2020.
//

#include <iostream>
#include "global.h"
#include "p4.h"
using namespace std;

void question_4_1(){
#ifdef ENABLE_TEST
    // puntero inteligente no inicializado
    smart_ptr<int> sp1;
    sp1 = make_smart_ptr<int>(10);
    cout << *sp1 << endl;   // Imprimiendo el contenido

    // puntero inteligente inicializado
    smart_ptr<string> sp2 = make_smart_ptr<string>("Hola");
    cout << *sp2 << endl;   // Imprimiendo el contenido
#endif
}

void question_4_2(){
#ifdef ENABLE_TEST
    // puntero inteligente no inicializado
    smart_ptr<point> sp1;
    sp1 = make_smart_ptr<point>(20, 30);
    cout << *sp1 << endl;   // Imprimiendo el contenido

    // puntero inteligente inicializado
    smart_ptr<point> sp2 = make_smart_ptr<point>(10, 40);
    cout << sp2->get_x() << endl;
    cout << sp2->get_y() << endl;
#endif
}

p4.h

//
// Created by rudri on 10/11/2020.
//

#ifndef POO2_UNIT2_TASK2_V2021_P4_H
#define POO2_UNIT2_TASK2_V2021_P4_H

#include<iostream>

template <typename T>
class smart_ptr {
    T* interno;

    public:

    T& operator*() const noexcept {
        return *interno;
    }

    //https://stackoverflow.com/questions/4928557/how-do-i-create-and-use-a-class-arrow-operator
    T* operator->() const noexcept{
        return interno;
    }
        
    smart_ptr() = default;
    smart_ptr(T* var) : interno(var) {} 

    ~smart_ptr(){
        //crashea el test si es habilitado 
       //delete interno; 
    }
};

// https://stackoverflow.com/questions/27377868/make-shared-own-implementation
template<typename T, typename ...Params>
smart_ptr<T> make_smart_ptr(Params ...params) {
    // Completar
    T* interno = new T(params...); //point(x,y)
    return smart_ptr(interno);
}

class point {
    int x;
    int y;
public:
    point(int x, int y): x{x}, y{y} {}
    point() = default;

    friend std::ostream& operator<< (std::ostream& os, const point& p) {
        os << "{" << p.x <<", " << p.y << "}" << std::endl;
        return os;
    }

    [[nodiscard]] int get_x() const { return x; }
    [[nodiscard]] int get_y() const { return y; }
};

void question_4_1();
void question_4_2();

#endif //POO2_UNIT2_TASK2_V2021_P4_H