Sainath Rao

• Dec 6th, 2011

 

Different ways of creating an oject is

shape a = new shape();

a is the object creation of one typefor the shape class with new operator.

shape a;

This is another type of creation of object fot the class.

neeraj

• Jan 3rd, 2012

 

You are not creating an object you are giving reference.

Isaac

• Feb 21st, 2012

 

1. Create on stack. i.e. ClassA varA;
2. Create on heap. i.e. ClassA *ptrA = new ClassA;

NikunjSingh

 Profile Answers by NikunjSingh 

• Feb 22nd, 2012

 

1. using normal object creation: Shape obj;
2. copy ctor: Shape obj2=obj;// or Shape obj3(obj);
3. using new operator;

Code
#include <iostream>


 


using namespace std;


 


class Shape{


public:


        Shape(){cout<<"Shape..."<<endl;}


        Shape(const Shape& obj)


        {


                cout<<"Copy called"<<endl;


        }


        void* operator new(size_t size)


        {


                cout<<"new...."<<endl;


                void* storage=malloc(size);


                if(NULL == storage) {


                        throw "allocation fail : no free memory";


                }


                return storage;


        }


 


        void operator delete (void*){


 


        }


};


 


int main()


{


        Shape obj;


        Shape obj2=obj;


        Shape obj3(obj);


        Shape* ptrShape=new Shape();


        Shape* ptrShapeOver= new Shape();


        return 0;


}