CPP

Destructor

Destructor is a special class function which destroys the object as soon as the scope of object ends.
The destructor is called automatically by the compiler when the object goes out of scope.
The syntax for destructor is same as that for the constructor, the class name is used for the name of destructor, with a tilde ~ sign as prefix to it.

Syntax:

class A
{
 public:
 ~A();
};

Destructors will never have any arguments.

Example:

#include <iostream>

class Line
{
 public:
 void setLength( double len );
 double getLength( void );
 Line(); // This is the constructor declaration
 ~Line(); // This is the destructor: declaration
 private:
 double length;
};

// Member functions definitions including constructor
Line::Line(void)
{
 cout << "Object is being created" << endl;
}
Line::~Line(void)
{
 cout << "Object is being deleted" << endl;
}
void Line::setLength( double len )
{
 length = len;
}
double Line::getLength( void )
{
 return length;
}
// Main function for the program

void main( )
{
 Line line;
 // set line length
 line.setLength(6.0);
 cout << "Length of line : " << line.getLength() <<endl;
 getch();
}