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Thinking in C++
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Modifying Stash to use access control

It makes sense to take the examples from Chapter 4 and modify them to use classes and access control. Notice how the client programmer portion of the interface is now clearly distinguished, so there’s no possibility of client programmers accidentally manipulating a part of the class that they shouldn’t.

//: C05:Stash.h
// Converted to use access control
#ifndef STASH_H
#define STASH_H

class Stash {
  int size;      // Size of each space
  int quantity;  // Number of storage spaces
  int next;      // Next empty space
  // Dynamically allocated array of bytes:
  unsigned char* storage;
  void inflate(int increase);
  void initialize(int size);
  void cleanup();
  int add(void* element);
  void* fetch(int index);
  int count();
#endif // STASH_H ///:~

The inflate( ) function has been made private because it is used only by the add( ) function and is thus part of the underlying implementation, not the interface. This means that, sometime later, you can change the underlying implementation to use a different system for memory management.

Other than the name of the include file, the header above is the only thing that’s been changed for this example. The implementation file and test file are the same.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire