是否有可能取代在运行时的方法在C / C ++？ [英] Is it possible to replace a method at runtime in C/C++?

问题描述

我想和能力的插件系统覆盖在运行时的方法。

I want to make a plugin system with the capability to override a method at runtime.

一些答案​​说函数指针，但如何定义的函数或类？

Some answers say function pointers, but how about a defined function or class?

这样的：

class foo
{
  public:
    bar(int foobar);
}

有没有一种方法来获取该函数指针，或者更换呢？

Is there a way to get function pointer for that, or replace it?

BTW;请不要说挂钩，因为它太特定于平台的和危险的。
如果你想说钩，请你只说不可能。

BTW; please don't say hook since it's too platform specific and dangerous. If you want to say hook, please just say IMPOSSIBLE.

推荐答案

运行功能替代品可以用的几种技术之一来实现：

Runtime function "replacement" can be achieved with one of several techniques:

1. 多态性


2. 标准库设施，如 STD ::功能


3. 第三方库或平台特定的技术来翻译或派遣函数调用。

在哪个选项是更好是高度依赖于预期的用途和目标环境。例如;插件系统很可能利用多态性（用适当的工厂，甚至可能与模板方法模式），而内部功能路由可以使用的std ::功能。

On which option is better is highly dependent on the intended use and target environments. For example; plugin systems could well make use of polymorphism (with the appropriate factories and possibly even combined with the template method pattern) whilst internal function routing could use std::function.

这些技术不会真正替换任何功能，而是可以在运行时根据需要设置路由功能调用。

These techniques wouldn't really "replace" any of the functions, but rather can be set up at runtime to route the function call as required.

的注意的我专注于问题的C ++方面的问题（它被标记C和C ++，但样品code是C ++）。

Note I've focused on the C++ aspects of the question (it was tagged C and C++ but the sample code is C++).

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