Tools.h++ Manual

ManualsBrandsHP ManualsServerHP NonStop G-Series

141

142

143

144

145

146

147

148

149

150

104011 Tandem Computers Incorporated 17-3

Note – how class Bus inherits from

RWCollectable

. We have chosen to

implement the set of customers by using class

RWSet

. This will guarantee that

the same person is not entered into the customer list more than once. For the

same reason, we have also chosen to implement the set of passengers using

class

RWSet

. However, for novelty, we have chosen to have this set live on the

heap. This will serve to illustrate some points in the coming discussion.

17.3 Steps to making an RWCollectable object

Here are the general steps to making your object inherit from

RWCollectable

. Specific details are given below.

Bus();

Bus(int busno, const RWCString& driver);

~Bus();

// Inherited from class "RWCollectable":

RWspace binaryStoreSize() const;

int compareTo(const RWCollectable*) const;

RWBoolean isEqual(const RWCollectable*) const;

unsigned hash() const;

void restoreGuts(RWFile&);

void restoreGuts(RWvistream&);

void saveGuts(RWFile&) const;

void saveGuts(RWvostream&) const;

void addPassenger(const char* name);

void addCustomer(const char* name);

size_t customers() const;

size_t passengers() const;

RWCString driver() const {return driver_;}

int number() const {return busNumber_;}

private:

RWSet customers_;

RWSet* passengers_;

int busNumber_;

RWCString driver_;

};