allTypeOfConstructor.cpp

/*
    author : aniket
*/

#include "iostream"
using namespace std;
#include "vector"

class Aniket
{

    public:
    int data;
    int *ptr;

    //default constructor
    Aniket()
    {
        cout<<" I am in default constructor"<<endl;
        data =0;
        ptr = new int;
        *ptr = 21;
    }
    //parameterised constructor
    Aniket(int input)
    {
        cout<<" I am in a parameterised constructor"<<endl;
        data = input;
        ptr = new int;
        *ptr = 23;
    }

    //copy constructor
    //reference is used to avoid looping 
    //const is used to avoid modification in original obj
    Aniket(const Aniket & temp)
    {
        cout<<"I am in a copy constructor"<<endl;
        this->data = temp.data;
        this->ptr = new int;
        this->ptr = temp.ptr;
    }

    //assign operator
    Aniket& operator =(const Aniket & temp)
    {
        cout<<"I am in a assign operator"<<endl;
        data = temp.data;
        this->ptr = new int;
        this->ptr = temp.ptr;
        return *this;
        //returning reference to avoid chaining proble eg obj1=(obj2=obj3)=obj6
    }

    //move constructor
    //for concept https://www.youtube.com/watch?v=JAOZjf4KneY
    Aniket ( Aniket && temp) //rvalue reference.
    {
        cout<<" I am in move constructor"<<endl;
        this->data = temp.data;
        this->ptr = temp.ptr;
        temp.ptr = NULL;
    }
};

int main()
{
    vector<Aniket> v1;
    //v1.push_back(Aniket());//default & move constructor(bcz its moving the reference/temporary obj);
    Aniket a1;
    Aniket a2 = a1;//copy constructor
    //v1.push_back(a1);//copy constructor(bcz it copying actual object)
    v1.push_back(move(a2));// move constructor gets called 
    Aniket a3;//default constructor
    a3 = a1;//assign operator;
    Aniket a5(move(a1));//move constructor;
}