Exceptional C++: 47 Engineering Puzzles, Programming Problems, and Solutions

Chapter 36. Memory Management—Part 2

Difficulty: 6

Are you thinking about doing your own class-specific memory management, or even replacing C++'s global new and delete? First, try this problem on for size.

The following code shows classes that perform their own memory management. Point out as many memory-related errors as possible, and answer the additional questions.

1. Consider the following code:

   class B 
   {
   public:
     virtual ~B();
     void operator delete  ( void*, size_t ) throw();
     void operator delete[]( void*, size_t ) throw();
     void f( void*, size_t ) throw();
   };
   class D : public B
   {
   public:
     void operator delete  ( void* ) throw();
     void operator delete[]( void* ) throw();
   };
   

   Why do B's operators delete have a second parameter, whereas D's do not? Do you ...