设计模式观后（c++还原之十二 命令模式）

以前在github给自己写日记习惯了，现在csdn写东西还是要更加规范点，以后还是写完全能编译的代码吧！

#include <iostream>#include <stdlib.h>#include <string>#include <list>#include <vector>#include <map>using std::map;using std::endl;using std::cout;using std::list;using std::vector;using std::string;//命令模式//作者前面的设计感觉可以归纳为，类的函数封装与类之间的父子关系。//最近的两个模式让我觉得，作者已经开始进入；类与类的关系，类与类的调用与封装了。//先看命令模式的示例： 需求组、美工组、代码组、客户类每增加一个需求就会多次无序调用这三个组//所以需要设计一个类似中介的类class Group {//抽象组类，作者一贯习惯public:virtual void Find() = 0;virtual void Add() = 0;virtual void Delete() = 0;virtual void Change() = 0;virtual void Plan() = 0;};//分别实现三组class RequirementGroup : public Group {public:void Find() {cout << "require find" << endl;}void Add() {cout << "require add" << endl;}void Change() {cout << "require change" << endl;}void Plan() {cout << "require plan" << endl;}void Delete() {cout << "require delete" << endl;}};class PageGroup : public Group {public:void Find() {cout << "page find" << endl;}void Add() {cout << "page add" << endl;}void Change() {cout << "page change" << endl;}void Plan() {cout << "page plan" << endl;}void Delete() {cout << "page delete" << endl;}};class CodeGroup : public Group {public:void Find() {cout << "code find" << endl;}void Add() {cout << "code add" << endl;}void Change() {cout << "code change" << endl;}void Plan() {cout << "code plan" << endl;}void Delete() {cout << "code delete" << endl;}};//封装客户的命令，产生命令类class Command {protected:RequirementGroup* p_rg;PageGroup*  p_pg;CodeGroup*  p_cg;public:Command(): p_rg(new RequirementGroup), p_pg(new PageGroup), p_cg(new CodeGroup){}virtual void execute() = 0;};class AddRequirementCommand : public Command {public://客户添加需求void execute() {p_rg->Find();p_rg->Add();p_rg->Plan();}};class DeletePageCommand : public Command {public:void execute() {p_pg->Find();p_rg->Delete();p_rg->Plan();}};class Invoker {private:Command* p_command;public:void SetCommand(Command* p_c) {p_command = p_c;}void action() {p_command->execute();}};class Client {public:static void Main() {//删除页面操作Invoker* p_in = new Invoker;Command* p_co = new DeletePageCommand;p_in->SetCommand(p_co);p_in->action();}};

<span style="font-family: Arial, Helvetica, sans-serif;">//命令模式基本三个角色</span>

<pre name="code" class="cpp">//接收者（工作组）、命令者（command）、调用者（invoker）.都要看情况设置抽象类和具体类//扩展，添加命令就好

int _tmain(int argc, _TCHAR* argv[]){Client::Main();system("pause");return 0;}