Перегрузить оператор +

Нужно перегрузить оператор +
Предложите варианты
Вот мой код:

#include<iostream>
using namespace std;



//#define CONSTRUCTORS_CHECK

class String
{
int size; //Размер строки
char* str; //Адрес строки в динамической памяти
public:
int get_size() const
{
return size;
}
char* get_str() const
{
return str;
}

// Constructors:
String(int size = 80)
{
this->size = size;
this->str = new char[size] {};
cout << "DefConstructor:\t" << this << endl;
}
String(const char str[])
{
this->size = strlen(str) + 1;
this->str = new char[size] {};
for (int i = 0; str[i]; i++)this->str[i] = str[i];
cout << "Constructor:\t" << this << endl;
}
String(const String& other)
{
this->size = other.size;
this->str = new char[size] {};
for (int i = 0; i < size; i++)this->str[i] = other.str[i];
cout << "CopyConstructor:" << this << endl;
}
~String()
{
delete[] this->str;
cout << "Destructor:\t" << this << endl;
}

// Operators:
String& operator=(const String& other)
{
if (this == &other)return *this;
delete[] this->str;
this->size = other.size;
this->str = new char[size] {};
for (int i = 0; i < size; i++)this->str[i] = other.str[i];
cout << "CopyAssignment: " << this << endl;
return *this;
}

void print()
{
cout << "size:\t" << size << endl;
cout << "str:\t" << str << endl;
}
};

ostream& operator<<(ostream& os, const String& obj)
{
return os << obj.get_str();
}

void main()
{
setlocale(LC_ALL, "");
#ifdef CONSTRUCTORS_CHECK
cout << typeid(typeid("Hello").name()).name() << endl;
String str0; //Default constructor
str0.print();
String str1 = "Hello"; //Single argument constructor
cout << str1 << endl;
String str2 = str1; //Copy Constructor
cout << str2 << endl;
str0 = str1; //Copy assignment
cout << str0 << endl;
cout << "\n---------------------------------\n";
str2 = str2;
cout << str2 << endl;
cout << "\n---------------------------------\n";
#endif // CONSTRUCTORS_CHECK

String str1 = "Hello";
String str2 = "World";
String str3 = str1 + str2;
cout << str3 << endl;
}

Код

#include<iostream>

using namespace std;







//#define CONSTRUCTORS_CHECK



class String

{

    int size;    //Размер строки

    char* str;    //Адрес строки в динамической памяти

public:

    int get_size() const

    {

        return size;

    }

    char* get_str() const

    {

        return str;

    }



    //            Constructors:

    String(int size = 80)

    {

        this->size = size;

        this->str = new char[size] {};

        cout << "DefConstructor:\t" << this << endl;

    }

    String(const char str[])

    {

        this->size = strlen(str) + 1;

        this->str = new char[size] {};

        for (int i = 0; str[i]; i++)this->str[i] = str[i];

        cout << "Constructor:\t" << this << endl;

    }

    String(const String& other)

    {

        this->size = other.size;

        this->str = new char[size] {};

        for (int i = 0; i < size; i++)this->str[i] = other.str[i];

        cout << "CopyConstructor:" << this << endl;

    }

    ~String()

    {

        delete[] this->str;

        cout << "Destructor:\t" << this << endl;

    }



    //            Operators:

    String& operator=(const String& other)

    {

        if (this == &other)return *this;

        delete[] this->str;

        this->size = other.size;

        this->str = new char[size] {};

        for (int i = 0; i < size; i++)this->str[i] = other.str[i];

        cout << "CopyAssignment: " << this << endl;

        return *this;

    }



    void print()

    {

        cout << "size:\t" << size << endl;

        cout << "str:\t" << str << endl;

    }

};



ostream& operator<<(ostream& os, const String& obj)

{

    return os << obj.get_str();

}



void main()

{

    setlocale(LC_ALL, "");

#ifdef CONSTRUCTORS_CHECK

    cout << typeid(typeid("Hello").name()).name() << endl;

    String str0;    //Default constructor

    str0.print();

    String str1 = "Hello";    //Single argument constructor

    cout << str1 << endl;

    String str2 = str1;    //Copy Constructor

    cout << str2 << endl;

    str0 = str1;    //Copy assignment

    cout << str0 << endl;

    cout << "\n---------------------------------\n";

    str2 = str2;

    cout << str2 << endl;

    cout << "\n---------------------------------\n";

#endif // CONSTRUCTORS_CHECK



    String str1 = "Hello";

    String str2 = "World";

    String str3 = str1 + str2;

    cout << str3 << endl;

}

Буду благодарен!!!