结构型设计模式---组合模式(Composite)

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组合模式：将对象组合成树形结构以表示“部分-整体”的层次结构。
Composite使得用户对单个对象和组合对象的使用具有一致性。

适用场景：
(1)所要表示的对象具有部分-整体的层次结构
(2)用户可以忽略组合对象与单个对象的不同，统一地使用组合结构中的所有对象

Composite.h

#ifndef _COMPOSITE_H_
#define _COMPOSITE_H_

#include <string>
#include <vector>
using std::string;
using std::vector;

class Component
{
public:
    virtual ~Component() {};
    Component(string , int);
    virtual void print(int ) = 0;

protected:
string name_;
int salary_;

};

class Worker : public Component
{
public:
Worker(string, int);
virtual void print(int);

};

class Manager : public Component
{
public:
     Manager(string, int);
     void add(Component *);
     virtual void print(int);

private:
vector<Component *> children_;

};

#endif

Composite.cpp

#include <iostream>
#include "Composite.h"
using std::cout;
using std::endl;

Component::Component(string name, int salary) : name_(name), salary_(salary)
{
}

Worker::Worker(string name, int salary) : Component(name, salary)
{
}

void Worker::print(int level)
{
     for (int i = 0; i < level; ++i)
         cout << "\t";
     cout << "Worker : " << name_ << " salary : " << salary_ << endl;
}

Manager::Manager(string name, int salary) : Component(name, salary)
{
}

void Manager::add(Component *com)
{
children_.push_back(com);
}

void Manager::print(int level)
{
     for (int i = 0; i < level; ++i)
         cout << "\t";
     cout << "Manager : " << name_ << " salary : " << salary_ << endl;

     if (!children_.empty())
     {
         for (int j = 0; j < level; ++j)
             cout << "\t";
         cout << "Subordinates of " << name_ << ": " << endl;
         ++level;
         int size = children_.size();
         for (int k = 0; k < size; ++k)
             children_[k]->print(level);
     }
}

main.cpp

#include "Composite.h"

int main()
{
Manager direct("Jim", 1000);

Manager mgrDev("Jun", 100);
Manager mgrQA("Na", 80);

    Worker qa("tao", 80);
    Worker qe("ou", 60);
    Worker pdev("zhen", 70);
    Worker sdev("denny", 60);

direct.add(&mgrDev);
direct.add(&mgrQA);

mgrDev.add(&pdev);
mgrDev.add(&sdev);

mgrQA.add(&qa);
mgrQA.add(&qe);

direct.print(0);

return 0;
}

Makefile

cc=g++
exe=main
obj= main.o Composite.o
$(exe): $(obj)
        $(cc) -o $(exe) $(obj)
main.o: main.cpp Composite.h
        $(cc) -c main.cpp
Composite.o: Composite.cpp Composite.h
        $(cc) -c Composite.cpp
clean:
        rm -rf *o $(exe)

output:

Manager : Jim salary : 1000
Subordinates of Jim:
Manager : Jun salary : 100
Subordinates of Jun:
  Worker : zhen salary : 70
  Worker : denny salary : 60
Manager : Na salary : 80
Subordinates of Na:
  Worker : tao salary : 80
  Worker : ou salary : 60

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