C++设计模式：外观模式

最新推荐文章于 2025-10-11 13:26:04 发布

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本文通过C++实现了一个图形工厂模式的示例，包括圆形、矩形和正方形等基本图形的创建与绘制。使用共享指针进行资源管理，展示了如何在面向对象编程中运用抽象基类和派生类。

一、源代码：

#include<iostream>
#include<memory>

using namespace std;

class Shape
{
public:
    virtual void draw() = 0;
    virtual ~Shape() = default;
};

class Rectangle:public Shape
{
public:
    virtual void draw() override
    {
        cout<<"Rectangle::draw()"<<endl;
    }
};

class Square:public Shape
{
public:
    virtual void draw() override
    {
        cout<<"Square::draw()"<<endl;
    }
};

class Circle:public Shape
{
public:
    virtual void draw() override
    {
        cout<<"Circle::draw()"<<endl;
    }
};

class ShapeMaker
{
public:
    ShapeMaker()
    {
        this->_circle = make_shared<Circle>();
        this->_rectangle = make_shared<Rectangle>();
        this->_square = make_shared<Square>();
    }
    void drawCircle()
    {
        this->_circle->draw();
    }
    void drawRectangle()
    {
        this->_rectangle->draw();
    }
    void drawSquare()
    {
        this->_square->draw();
    }
private:
    shared_ptr<Shape> _circle;
    shared_ptr<Shape> _rectangle;
    shared_ptr<Shape> _square;
};

int main()
{
    shared_ptr<ShapeMaker> shapeMaker = make_shared<ShapeMaker>();
    shapeMaker->drawCircle();
    shapeMaker->drawRectangle();
    shapeMaker->drawSquare();
}

二、运行结果：