public PowerOfTwoAllocator(int size){
  super();
  add(new Region(0,size - 1));
  this.size=size;
}

public PowerOfTwoAllocator ( int size ) { super ( ) ; add ( new Region ( 0 , size - 1 ) ) ; this . size = size ; }
create a power - of - two allocator with the given initial ' free ' size area .
