Animal.h
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上传日期:2022-06-29
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书籍源码
开发平台:
Visual C++
- /*
- * This file contains code from "C++ Primer, Fourth Edition", by Stanley B.
- * Lippman, Jose Lajoie, and Barbara E. Moo, and is covered under the
- * copyright and warranty notices given in that book:
- *
- * "Copyright (c) 2005 by Objectwrite, Inc., Jose Lajoie, and Barbara E. Moo."
- *
- *
- * "The authors and publisher have taken care in the preparation of this book,
- * but make no expressed or implied warranty of any kind and assume no
- * responsibility for errors or omissions. No liability is assumed for
- * incidental or consequential damages in connection with or arising out of the
- * use of the information or programs contained herein."
- *
- * Permission is granted for this code to be used for educational purposes in
- * association with the book, given proper citation if and when posted or
- * reproduced.Any commercial use of this code requires the explicit written
- * permission of the publisher, Addison-Wesley Professional, a division of
- * Pearson Education, Inc. Send your request for permission, stating clearly
- * what code you would like to use, and in what specific way, to the following
- * address:
- *
- * Pearson Education, Inc.
- * Rights and Contracts Department
- * 75 Arlington Street, Suite 300
- * Boston, MA 02216
- * Fax: (617) 848-7047
- */
- #include <string>
- #include <iostream>
- class Endangered {
- public:
- virtual ~Endangered();
- virtual std::ostream& print(std::ostream&) const;
- virtual void highlight() const;
- // ...
- };
- class ZooAnimal;
- extern std::ostream&
- operator<<(std::ostream&, const ZooAnimal&);
- class ZooAnimal {
- public:
- ZooAnimal();
- ZooAnimal(std::string animal, bool exhibit,
- std::string family): nm(animal),
- exhibit_stat(exhibit),
- fam_name(family) { }
- virtual ~ZooAnimal();
- virtual std::ostream& print(std::ostream&) const;
- virtual int population() const;
- // accessors
- std::string name() const { return nm; }
- std::string family_name() const { return fam_name; }
- bool onExhibit() const { return exhibit_stat; }
- // ...
- protected:
- std::string nm;
- bool exhibit_stat;
- std::string fam_name;
- // ...
- private:
- };
- class Bear : public ZooAnimal {
- enum DanceType { two_left_feet, macarena, fandango, waltz };
- public:
- Bear();
- Bear(std::string name, bool onExhibit=true,
- std::string family = "Bear"):
- ZooAnimal(name, onExhibit, family),
- ival(0), dancetype(two_left_feet) { }
- virtual std::ostream &print(std::ostream&) const;
- virtual int toes() const;
- int mumble(int);
- void dance(DanceType) const;
- virtual ~Bear();
- private:
- int ival;
- DanceType dancetype;
- };
- class Panda : public Bear, public Endangered {
- public:
- Panda();
- Panda(std::string name, bool onExhibit=true);
- virtual ~Panda();
- virtual std::ostream& print(std::ostream&) const;
- void highlight();
- virtual int toes();
- virtual void cuddle();
- // ...
- };
- Panda::Panda(std::string name, bool onExhibit)
- : Bear(name, onExhibit, "Panda") { }
- inline
- std::ostream& Panda::print(std::ostream &os) const
- {
- Bear::print(os); // print the Bear part
- Endangered::print(os); // print the Endangered part
- return os;
- }
- class PolarBear : public Bear { /* . . . */ };