什么是性病::功能的性能开销？ [英] What is the performance overhead of std::function?

问题描述

我听到有关使用论坛的std ::功能＆LT;＆GT; 会导致性能下降。是真的吗？如果属实，这是一个很大的性能下降？

I heard on a forum using std::function<> causes performance drop. Is it true? If true, is it a big performance drop?

推荐答案

您可以找到升压的参考材料信息：的的开销如何通过升压::功能承担？和<一通话href=\"http://www.boost.org/doc/libs/1_45_0/doc/html/function/misc.html#id1285061\">Performance

You can find information from the boost's reference materials: How much overhead does a call through boost::function incur? and Performance

这并不能确定是或否来提振作用。给定的程序要求的性能下降可能是很好接受的。通常情况下，一个项目的部分不是性能关键。而且即便如此，它是可以接受的。这是唯一的东西，你可以决定。

This doesn't determine "yes or no" to boost function. The performance drop may be well acceptable given program's requirements. More often than not, parts of a program are not performance-critical. And even then it may be acceptable. This is only something you can determine.

至于标准库版本，该标准仅定义了一个接口。这完全取决于个人的实现，使其工作。我想，有着相似的应用，以提高的功能将被使用。

As to the standard library version, the standard only defines an interface. It is entirely up to individual implementations to make it work. I suppose a similar implementation to boost's function would be used.

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