test_copy_elision

#include <iostream>
#include <string>

static size_t counter = 0;

using namespace std;

class Number {
private:
    int a_;

public:
    Number() {
        cout << "Default Ctor"s << endl;
        cout << "at " << this << endl;
        ++counter;
    }
    Number(int num)
        : a_(num)
    {
        cout << "Ctor(int)"s << endl;
        cout << "at " << this << endl;
        ++counter;

    }
    Number(const Number& other)
        : a_(other.a_)
    {
        cout << "Copy Ctor"s << endl;
        cout << "at " << this << endl;
        cout << "other " << this << endl;
        ++counter;

    }
    ~Number() {
        cout << "Dtor"s << endl;
        cout << "at " << this << endl;
        ++counter;

    }
    Number& operator=(const Number& other) {
        a_ = other.a_;
        cout << "Op="s << endl;
        cout << "this op= " << this << endl;
        cout << "other " << &other << endl;
        ++counter;

        return *this;
    }
    Number operator+(const Number& second) {
        cout << "Op+" << endl;
        cout << "this op+ " << this << endl;
        cout << "second " << &second << endl;
        Number tmp_num(a_ + second.a_);
        cout << "tmp_num " << &tmp_num << endl;
        ++counter;

        return a_ + second.a_;
    }
};

int main() {
    Number a(1), b(1), c;
    c = a + b;
    cout << "End of calculations"s << endl;
    cout << counter << endl;
}