builder模式

builder实现project里面具体复杂对象的实现

Director指定生成哪些复杂对象

打个比方就像去吃鸡公煲，你把菜单(Director)给服务员，厨师(厨师做饭的过程就是builder)根据菜单做饭(project)

builder.h

#ifndef _BUILDER_H

#define _BUILDER_H

#include <iostream>

#include <string>

using namespace std;

class Project

{

public:

Project() {}

~Project() {}

public:

string str1;

string str2;

};

class Builder

{

public:

virtual ~Builder() {}

virtual void BuildStr1() {}

virtual void BuildStr2() {}

protected:

Builder() {

project_ = new Project;

}

public:

Project* project_;

};

class RealBuilder : public Builder

{

public:

RealBuilder() : Builder() {};

virtual ~RealBuilder() {};

void BuildStr1() {

project_->str1 = "string1";

}

void BuildStr2() {

project_->str2 = "string2";

}

};

class Director

{

public:

Director(Builder* build) : builder_(build) {}

Project* Construct() {

builder_->BuildStr1();

builder_->BuildStr2();

return builder_->project_;

}

private:

Builder* builder_;

};

#endif // _BUILDER_H

builder.cpp

#include "builder.h"

int main()

{

Builder* build = new RealBuilder;

Director *con = new Director(build);

Project* project = con->Construct();

cout << project->str1 << endl;

cout << project->str2 << endl;

return 0;

}

编译:make builder