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);
public:
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.
