Global Web Forum

Muhammad

بِسمِ اللَّهِ الرَّحمٰنِ الرَّحيمِ

From: Sahiwal Division

Registered: 2012-03-22

Posts: 22,197

Website

How can we restrict dynamic allocation of objects?

Programming Languages Quizzes Operator Overloading

Question:
How can we restrict dynamic allocation of objects of a class using new?

Option A):
By overloading new operator
Option B):
By overloading new operator and new[] operators
Option C):
By making an empty private new and new[] operators
Option D):
By making an empty private new operator.

Correct Answer is Option C):
By making an empty private new and new[] operators

Explanation:
If we declare new and [] new operators, then the objects cannot be created anywhere (within the class and outside the class) See the following example. We can not allocate an object of type Test using new.
#include <stdlib.h>
#include <stdio.h>
#include <iostream>

using namespace std;

class Test {
private:
    void* operator new(size_t size) {}
    void* operator new[](size_t size) {}
};

int main()
{
    Test *obj = new Test;
    Test *arr = new Test[10];
    return 0;
}

---

Online Web Tutorials And Interview Questions With Answers Forum:
https://globalguideline.com/forum/