虚拟函数和性能 - C ++ [英] Virtual functions and performance - C++

问题描述

在我的类设计中，我广泛使用抽象类和虚拟函数。我有一种感觉，虚拟功能影响性能。这是真的？但我认为这种性能差异不明显，看起来像我做过早优化。对吗？

In my class design, I use abstract classes and virtual functions extensively. I had a feeling that virtual functions affects the performance. Is this true? But I think this performance difference is not noticeable and looks like I am doing premature optimization. Right?

推荐答案

一个好的经验法则是：

这不是一个性能问题，直到你可以证明。

It's not a performance problem until you can prove it.

使用虚拟函数将有一个非常轻微的对性能的影响，但不会影响应用程序的整体性能。更好的地方寻找性能改进是在算法和I / O。

The use of virtual functions will have a very slight effect on performance, but it's unlikely to affect the overall performance of your application. Better places to look for performance improvements are in algorithms and I/O.

一个很好的文章谈论虚拟函数（和更多）是成员函数指针和最快的C ++代理。

An excellent article that talks about virtual functions (and more) is Member Function Pointers and the Fastest Possible C++ Delegates.

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