To overload the new and delete operators to provide custom dynamic allocation and deallocation of memory.

 

Experiment 4

Aim

To overload the new and delete operators to provide custom dynamic allocation and deallocation of memory.

Objectives

• To understand dynamic memory allocation.
• To understand operator overloading for memory management.
• To implement class-specific new and delete.
• To observe custom memory allocation and deallocation.

Theory

The new operator allocates memory and invokes the constructor, whereas delete releases memory and invokes the destructor.

C++ allows these operators to be overloaded for a class to provide custom memory management.

Program

#include <iostream>

#include <cstdlib>

using namespace std;

 

class Demo {

    int value;

 

public:

    Demo(int v = 0) {

        value = v;

        cout << "Constructor called\n";

    }

 

    void show() {

        cout << "Value = " << value << endl;

    }

 

    void* operator new(size_t size) {

        cout << "Custom new called\n";

        return malloc(size);

    }

 

    void operator delete(void *p) {

        cout << "Custom delete called\n";

        free(p);

    }

};

 

int main() {

    Demo *p = new Demo(100);

 

    p->show();

 

    delete p;

 

    return 0;

}

Result

Thus, the new and delete operators were successfully overloaded to provide custom memory allocation and deallocation.