设计模式-命令模式

命令模式是将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化；对请求排队或记录请求日志，以及支持可撤销的操作。
其UML类图如下：

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
// 烤肉师傅
class doctor
{
public:
    void make_eye()
    {
        std::cout << "眼科" << std::endl;
    }
    void make_ear()
    {
        std::cout << "耳科" << std::endl;
    }
};
// 命令类
class Command
{
protected:
    doctor * m_doc;
public:
    Command(doctor * p)
    {
        m_doc = p;
    }
    virtual void make() = 0;
};

class Command1 : public Command
{
public:
    Command1(doctor * p) : Command(p) {}
    void make()
    {
        m_doc->make_eye();
    }
};

class Command2 : public Command
{
public:
    Command2(doctor * p) : Command(p) {}
    void make()
    {
        m_doc->make_ear();
    }
};
// 服务员
class nurse
{
private:
    std::vector<Command *> m_vec;
public:
    ~nurse()
    {
        for (auto it = m_vec.begin(); it != m_vec.end(); it++)
        {
            delete(*it);
        }
        m_vec.clear();
    }
    void add(Command * p)
    {
        m_vec.push_back(p);
    }
    void submit()
    {
        for (auto it = m_vec.cbegin(); it != m_vec.cend(); it++)
        {
            (*it)->make();
        }
    }
};

int main() {
    nurse * nur = new nurse();
    doctor * d = new doctor();
    nur->add(new Command1(d));
    nur->add(new Command2(d));
    nur->submit();
    delete nur;
    delete d;
    return 0;
}