Compiler auto-generated Copy Constructor

If you don’t write your own copy constructor, the compiler generate a defaut one for you, to copy member variables one-by-one.

example:

#include <iostream>

using namespace std;

class MyClass{
    public:
        MyClass();
        MyClass(string note, const string mName = "DEFAULT_NAME");
        ~MyClass();
    private:
        string myName;
        string myNote;
};

MyClass::MyClass(){
    myName = "default constructor without argument";
    myNote = "";
    cout << "MyClass Constructor: " << myName << endl;

}

MyClass::MyClass(string note, const string mName){
    myName = mName;
    myNote = note;
    cout << "MyClass Constructor: " << myName << " : " << myNote << endl;
}


MyClass::~MyClass(){
    cout << "MyClass Destructor: " << myName << endl;
}

int main()
{
    MyClass myClass1;
    MyClass myClass2("Using default Name");
    MyClass myClass3("with name", "MyClass 3");
    MyClass copyClass(myClass3);
    return 0;
}