Dynamic Memory Management with Operators new and delete

• Dynamic memory management
  • Control allocation and deallocation of memory
  • Operators new and delete
    • Include standard header $<$new$>$; Access to standard version of new
• new
  • Consider
    • Time *timePtr;
    • timePtr = new Time;
  • new operator
    • Creates object of proper size for type Time; Error if no space in memory for object
    • Calls default constructor for object
    • Returns pointer of specified type
  • Providing initializers
    • double *ptr = new double( 3.14159 );
    • Time *timePtr = new Time( 12, 0, 0 );
  • Allocating arrays; int *gradesArray = new int[ 10 ];
• delete
  • Destroy dynamically allocated object and free space
  • Consider; delete timePtr;
  • Operator delete
    • Calls destructor for object
    • Deallocates memory associated with object; Memory can be reused to allocate other objects
  • Deallocating arrays
    • delete [] gradesArray; ; Deallocates array to which gradesArray points
    • If pointer to array of objects
      • First calls destructor for each object in array
      • Then deallocates memory