[C++] Pointeurs et valeurs

#include <iostream>

using std::cout;
using std::endl;

class Entier2
{
public :

    int* value;

    explicit Entier2(int val = 10) {
        value = new int(val);
    }
    
    ~Entier2()  {
        delete value;
    }
    
    // Constructeur par copie
    Entier2(const Entier2& original) {
        value = new int(*original.value);
    }
    
    // Affectation par copie
    const Entier2& operator=(const Entier2& original) {
        if (this != &original)
            *value = *original.value;
        return *this;
    }
};


int main()
{
    Entier2 a(20);
    
    cout << *(a.value) << endl;
    cout << a->value << endl;   // error: base operand of ‘->’ has non-pointer type ‘Entier2’
    
    return 0;
}

#include <iostream>

using std::cout;
using std::endl;
using std::ostream;

class Entier {
    int value;

public :

    explicit Entier(int val = 10) : value(val) {}
    
    void print(ostream& out = cout) const {
        out << value;
    }
};

ostream& operator<< (ostream& out, const Entier& e) const {
    e.print(out);
    return out;
}

int main() {
    Entier a(42);

    cout << a;
    return 0;
}