c ++中的静态虚函数 [英] Static Virtual functions in c++

问题描述

我有一个基类和一个派生类，我想更改基本函数，同时保持它们是静态的，因为它们应该作为静态传递给其他函数。

I have a base class and a derived one and I want to change base functions while keeping them static as they should be passed to other functions as static.

如何我可以这样做吗？

推荐答案

ATL框架通过使基类成为模板来克服无虚拟静态的限制，然后让派生类将其类类型作为模板参数传递。然后，基类可以在需要时调用派生类静态，例如：

The ATL framework gets around the limitation of no virtual statics by making the base class be a template, and then having derived classes pass their class type as a template parameter. The base class can then call derived class statics when needed, eg:

template< class DerivedType >
class Base
{
public:
  static void DoSomething() { DerivedType::DoSomethingElse(); }
};

class Derived1 : public Base<Derived1>
{
public:
  static void DoSomethingElse() { ... }
};

class Derived2 : public Base<Derived2>
{
public:
  static void DoSomethingElse() { ... }
};

这被称为奇怪的重复模板模式，可用于实现静态多态。

This is known as Curiously recurring template pattern, which can be used to implement static polymorphism.

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