C++设计模式：命令模式

最新推荐文章于 2025-09-29 09:15:54 发布

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本文介绍了一种使用命令模式实现股票买卖操作的设计模式。通过创建BuyStock和SellStock类继承自Order基类，实现了股票的买入和卖出操作。Broker类负责接收和执行这些订单，展示了一个典型的命令模式应用。

一、源代码

#include<iostream>
#include<memory>
#include<vector>

using namespace std;

class Order
{
public:
    virtual void execute() = 0;
    virtual ~Order() = default;
};

class Stock
{
public:
    Stock()
    {
        _name = "ABC";
        _quantity = 10;
    }
    void buy()
    {
        cout<<"Stock [Name: "<<_name<<",Quantity: "<<_quantity<<"] bought"<<endl;
    }
    void sell()
    {
        cout<<"Stock [Name: "<<_name<<",Quantity: "<<_quantity<<"] sold"<<endl;
    }
private:
    string _name;
    int _quantity;
};

class BuyStock:public Order
{
public:
    BuyStock(shared_ptr<Stock> abcStock)
    {
        this->_abcStock = abcStock;
    }
    virtual void execute() override
    {
        _abcStock->buy();
    }
private:
    shared_ptr<Stock> _abcStock;
};

class SellStock:public Order
{
public:
    SellStock(shared_ptr<Stock> abcStock)
    {
        this->_abcStock = abcStock;
    }
    virtual void execute() override
    {
        _abcStock->sell();
    }
private:
    shared_ptr<Stock> _abcStock;
};

class Broker
{
public:
    void takeOrder(shared_ptr<Order> order)
    {
        _orderVector.push_back(order);
    }
    void placeOrder()
    {
        for(const auto& order:_orderVector)
        {
            order->execute();
        }
        _orderVector.clear();
    }
private:
    vector<shared_ptr<Order>> _orderVector = {};
};

int main()
{
    shared_ptr<Stock> abcStock= make_shared<Stock>();

    shared_ptr<Order> buyStockOrder = make_shared<BuyStock>(abcStock);
    shared_ptr<Order> sellStockOrder = make_shared<SellStock>(abcStock);

    shared_ptr<Broker> broker= make_shared<Broker>();
    broker->takeOrder(buyStockOrder);
    broker->takeOrder(sellStockOrder);

    broker->placeOrder();
}

二、运行结果