Destructors in C++
Destructors
Destructors in C++ are opposite of constructors while constructors initialize the value for an object that is instantiated. Destructors destroy the objects and assigned value to them.
Destructors in C++ are called when –
- The object goes out of scope of execution
- Are automatically called by compiler if are not manually defined by the user
Destructors are special functions of a class
- Have the same name as the name of the class
- Are preceded with
~for example for class named as Demo the destructor will be ~Demo() - No argument passing or copying happens unlike constructors where we can parameterize or copy
Syntax
class Demo
{
public:
~Demo();
};
Example of a Destructor
Run
#include <iostream>
using namespace std;
class Demo
{
public:
//Initialising the Constructor Destructor
Demo()
{
cout << "Object has been Constructed\n";
}
~Demo()
{
cout << "We have Destroyed the object\n";
}
};
int main()
{
Demo demo;
// Constructor Called
int temp=1;
if(temp)
{
// Constructor calling happens here
Demo prepinsta;
}
// The scope of the object initialised prepinsta has ended here so the destructor will be called automatically by the system.
}
// Destructor called for Demo as demo object's out of scopeOutput –
Object has been Constructed Object has been Constructed We have Destroyed the object We have Destroyed the object
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