编辑“︁C++ 抽象工厂模式”︁（章节）

== 代码示例 ==
以下是一个简单的C++抽象工厂模式示例，展示了如何创建不同操作系统的UI组件（按钮和文本框）。

<syntaxhighlight lang="cpp">
#include <iostream>
#include <memory>

// 抽象产品：按钮
class Button {
public:
    virtual void render() = 0;
    virtual ~Button() = default;
};

// 具体产品：Windows按钮
class WindowsButton : public Button {
public:
    void render() override {
        std::cout << "渲染Windows风格按钮" << std::endl;
    }
};

// 具体产品：MacOS按钮
class MacOSButton : public Button {
public:
    void render() override {
        std::cout << "渲染MacOS风格按钮" << std::endl;
    }
};

// 抽象产品：文本框
class TextBox {
public:
    virtual void render() = 0;
    virtual ~TextBox() = default;
};

// 具体产品：Windows文本框
class WindowsTextBox : public TextBox {
public:
    void render() override {
        std::cout << "渲染Windows风格文本框" << std::endl;
    }
};

// 具体产品：MacOS文本框
class MacOSTextBox : public TextBox {
public:
    void render() override {
        std::cout << "渲染MacOS风格文本框" << std::endl;
    }
};

// 抽象工厂
class UIFactory {
public:
    virtual std::unique_ptr<Button> createButton() = 0;
    virtual std::unique_ptr<TextBox> createTextBox() = 0;
    virtual ~UIFactory() = default;
};

// 具体工厂：Windows工厂
class WindowsUIFactory : public UIFactory {
public:
    std::unique_ptr<Button> createButton() override {
        return std::make_unique<WindowsButton>();
    }

    std::unique_ptr<TextBox> createTextBox() override {
        return std::make_unique<WindowsTextBox>();
    }
};

// 具体工厂：MacOS工厂
class MacOSUIFactory : public UIFactory {
public:
    std::unique_ptr<Button> createButton() override {
        return std::make_unique<MacOSButton>();
    }

    std::unique_ptr<TextBox> createTextBox() override {
        return std::make_unique<MacOSTextBox>();
    }
};

// 客户端代码
void createUI(UIFactory& factory) {
    auto button = factory.createButton();
    auto textBox = factory.createTextBox();

    button->render();
    textBox->render();
}

int main() {
    // 创建Windows风格的UI
    WindowsUIFactory windowsFactory;
    std::cout << "Windows UI:" << std::endl;
    createUI(windowsFactory);

    // 创建MacOS风格的UI
    MacOSUIFactory macOSFactory;
    std::cout << "\nMacOS UI:" << std::endl;
    createUI(macOSFactory);

    return 0;
}
</syntaxhighlight>

=== 输出 ===
<pre>
Windows UI:
渲染Windows风格按钮
渲染Windows风格文本框

MacOS UI:
渲染MacOS风格按钮
渲染MacOS风格文本框
</pre>