virt.h
资源名称:CppPrimer.rar [点击查看]
上传用户:qdkongtiao
上传日期:2022-06-29
资源大小:356k
文件大小:4k
源码类别:
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:
- enum Status { critical, environment, improving };
- Endangered(Status stat): animal_status(stat) { }
- virtual ~Endangered();
- virtual std::ostream& print(std::ostream&) const;
- virtual void highlight() const;
- // ...
- private:
- Status animal_status;
- };
- 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:
- };
- // the order of the keywords public and virtual is not significant
- class Raccoon : public virtual ZooAnimal {
- public:
- Raccoon();
- Raccoon(std::string name, bool onExhibit=true);
- virtual std::ostream& print(std::ostream&) const;
- bool pettable() const {return pettable_flag; }
- void pettable(bool petval) {pettable_flag = petval;}
- // ...
- protected:
- bool pettable_flag;
- // ...
- };
- class Bear : virtual public ZooAnimal {
- public:
- // when the most derived class
- Bear(std::string name, bool onExhibit=true);
- protected:
- // when an intermediate derived class
- Bear() : dance_flag(two_left_feet) { }
- public:
- enum DanceType { two_left_feet, macarena, fandango };
- virtual std::ostream &print(std::ostream&) const;
- virtual std::string isA() const;
- int mumble(int);
- void dance(DanceType) const;
- virtual ~Bear();
- private:
- std::string name;
- int ival;
- DanceType dance_flag;
- };
- class Panda : public Bear,
- public Raccoon, public Endangered {
- public:
- Panda();
- Panda(std::string name, bool onExhibit=true);
- virtual std::ostream& print(std::ostream&) const;
- bool sleeping() const {return sleeping_flag;}
- void sleeping(bool newval) {sleeping_flag = newval;}
- // ...
- protected:
- bool sleeping_flag;
- // ...
- };
- Bear::Bear(std::string name, bool onExhibit):
- ZooAnimal(name, onExhibit, "Bear") { }
- Raccoon::Raccoon(std::string name, bool onExhibit)
- : ZooAnimal(name, onExhibit, "Raccoon") { }
- Panda::Panda(std::string name, bool onExhibit)
- : ZooAnimal(name, onExhibit, "Panda"),
- Bear(name, onExhibit),
- Raccoon(name, onExhibit),
- Endangered(Endangered::critical),
- sleeping_flag(false) { }