C++ Auto_Ptr

What is auto_ptr?

• auto_ptr is a smart pointer.
• Owns a dynamically allocated object and performs cleanup when not needed.
• Prevents memory leaks
• The object destructor is called during destruction.
• "release()" method could be used to take manual ownership of the object.

EXAMPLE: Demonstrate the auto_ptr releasing dynamically allocated object.

#include <iostream>

using namespace std;

class MyClass {
        int data1;
    public:
        MyClass() {
        data1 = 100;
    }
    void print() {
        cout << data1 << endl;
    }
};

void func() {

    auto_ptr<MyClass> ptr(new MyClass());

    ptr->print();

    // Delete not done
    // When ptr goes out of scope MyClass object is automatically destroyed
    // No memory leak is introduced
}

void main() {
    func();
}

OUTPUT:
100

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