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Function inheritance allows derived classes to override base class functions to avoid code duplication. Implementation method: Use the override keyword before derived class functions. Practical case: In the plug-in architecture, the plug-in class serves as the base class, and the derived class provides plug-in implementation. The plug-in is dynamically loaded and run through the PluginManager class.
Function inheritance allows you to inherit in derived classes Base class functions to avoid duplication of code. The functions of the derived class will override the functions of the base class, which means that the functions of the derived class will be called at runtime instead of the functions of the base class.
To implement function inheritance, you need to use the override
keyword in the class definition of the derived class to override the functions of the base class. For example:
class Base { public: virtual void print() { std::cout << "Base class print" << std::endl; } }; class Derived : public Base { public: virtual void print() override { std::cout << "Derived class print" << std::endl; } };
Function inheritance is very useful when creating a pluggable architecture. In a pluggable architecture, you can load and unload different modules or components at runtime. This is useful when you need to dynamically change application functionality or provide customizable extensions.
The following is an example of using function inheritance to implement a pluggable architecture:
class Plugin { public: virtual void init() = 0; virtual void run() = 0; virtual void terminate() = 0; }; class PluginA : public Plugin { public: void init() override {} void run() override { std::cout << "Plugin A is running" << std::endl; } void terminate() override {} }; class PluginB : public Plugin { public: void init() override {} void run() override { std::cout << "Plugin B is running" << std::endl; } void terminate() override {} }; class PluginManager { public: std::vector<std::unique_ptr<Plugin>> plugins; void loadPlugin(std::unique_ptr<Plugin> plugin) { plugins.push_back(std::move(plugin)); } void runPlugins() { for (auto& plugin : plugins) { plugin->run(); } } };
In this example, the Plugin
class acts as a base class and defines the interface of the plug-in ( init()
, run()
, terminate()
). PluginA
and PluginB
are derived classes that provide the actual plug-in implementation. PluginManager
The class is responsible for managing plug-ins and allows dynamic loading and running of plug-ins.
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