return value optimization

return_value_optimization.cpp

#include <iostream>
#include <unistd.h>

class myClass{
public:
    myClass(){
        std::cout << "constructor called" << std::endl;
    }
    ~myClass(){
        std::cout << "destructor called" << std::endl;
    }
    myClass(const myClass& other){
        std::cout << "const copy constructor called" << std::endl;
    }
    myClass(myClass& other){
        std::cout << "copy constructor called" << std::endl;
    }
};

myClass func(){
    return myClass();
}

int main(){
    myClass b(func());
    myClass c;
    myClass d(b);
    c = func();
    return 0;
}

/*
constructor called
constructor called
copy constructor called
constructor called
destructor called
destructor called
destructor called
destructor called
*/