Memory Allocation

• Many times, you are not aware in advance how much memory you will need to store particular information in a defined variable and the size of required memory can be determined at run time.
• You can allocate memory at run time within the heap for the variable of a given type using a special operator in C++ which returns the address of the space allocated. This operator is called new operator.
• If you are not in need of dynamically allocated memory anymore, you can usedelete operator, which de-allocates memory previously allocated by new operator.

Memory Allocation for Objects:

• Objects are no different from simple data types.
• For example,  following code where we are going to use an array of objects to clear your concept:

Example:

#include <iostream>

class Box
{
   public:
      Box() { 
         cout << "Constructor is called!" <<endl; 
      }
      ~Box() { 
         cout << "Destructor is called!" <<endl; 
      }
};

void main( )
{
   Box* myBoxArray = new Box[4];

   delete [] myBoxArray; // Delete array
   getch();
}

Output:

Constructor is called!
Constructor is called!
Constructor is called!
Constructor is called!
Destructor is called!
Destructor is called!
Destructor is called!
Destructor is called!

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