虚函数和性能 - C++

问题描述

在我的类设计中，我广泛使用抽象类和虚函数.我有一种感觉，虚函数会影响性能.这是真的?但我认为这种性能差异并不明显，看起来我正在做过早的优化.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:

除非你能证明它，否则这不是性能问题.

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

使用虚函数会对性能产生非常轻微的影响，但不太可能影响应用程序的整体性能.寻找性能改进的更好的地方是算法和 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.

一篇关于虚函数(以及更多)的优秀文章是成员函数指针和最快的 C++ 委托.

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

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