Copy Constructor

A copy constructor is one that takes a single argument of the same type as the class, passed by reference. Such that you can copy member variable from another object of the same class.

example:

#include <iostream>

using namespace std;

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

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

}

//Copy Constructor
MyClass::MyClass(MyClass& src){
    myName = src.myName;
    myNote = src.myNote;
    cout << "Copy Constructor: " << myName << " : " << myNote << 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;
}

Related Post:
- Compiler auto-generated Copy Constructor