46 lines
671 B
C++
46 lines
671 B
C++
#ifndef __VISITOR_H__
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#define __VISITOR_H__
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#include <iostream>
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using namespace std;
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// 前向声明
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class Element;
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class Apple;
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class Book;
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// 抽象访问者
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class Visitor
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{
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public:
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Visitor(){};
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virtual ~Visitor(){}
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// 声明一组访问方法
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virtual void visit(Apple*) = 0;
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virtual void visit(Book*) = 0;
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};
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// 具体访问者：顾客
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class Customer :public Visitor
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{
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public:
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Customer();
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Customer(string iName);
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void setNum(Apple*, int);
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void setNum(Book*, int);
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void visit(Apple* apple);
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void visit(Book* book);
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private:
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string name;
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};
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// 具体访问者：收银员
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class Cashier :public Visitor
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{
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public:
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Cashier();
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void visit(Apple* apple);
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void visit(Book* book);
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};
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#endif |