---

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;

class MyStr {
    int length{ 0 };
    char* buff{ nullptr };
public:
    MyStr() : length(0), buff(nullptr) {
        cout << "  MyStr default constr.\n";
    }
    MyStr(const char* init_val) {
    if (init_val == nullptr) {
        length = 0;
        buff = nullptr;
        cout << "строка введена 0";
    } 
    else {
        length = strlen(init_val);
        buff = new char[length + 1];
        strcpy(buff, init_val);
    }
    cout << "  MyStr( char * ) constr.\n";
}
    MyStr(const MyStr& other) {

    }
    ~MyStr() {
        cout << "  MyStr destr.\n";
        delete[] buff;
    }
    int size() { return length; }
    MyStr& operator= (const MyStr& other) {
        return *this;
    }


    friend MyStr operator+(const MyStr& s1, const MyStr& s2);
    friend ostream& operator<< (ostream&, const MyStr&);
    char& operator[] (int index) {
        return buff[index];
    }
};
MyStr operator+(const MyStr& s1, const MyStr& s2) {
    MyStr res;

    return res;
}
ostream& operator<< (ostream& os, const MyStr& s) {
    return os;
}


int main() {
    MyStr a;
    MyStr b = "World!";
    /*///////////////
    MyStr c = a;
    ///////////////
    MyStr c2;
    c2 = a;
    ///////////////

    c = a + b;
    cout << c << endl;
*/
    return 0;

}