什么是内联？ [英] What is inlining?

问题描述

我指的是此次讨论。我从来没有在C或C ++中编写任何代码。我没有任何CS背景。然而，我已经工作作为Java开发人员5年了，现在我已经决定更多地了解CS，并做一些追赶。

解决方案

p>当执行给定的代码段时，每当调用标准函数时，执行时间稍微高于将该函数中包含的代码转储。每次包含在一个函数中的整个代码在另一端都倾向于不可缓冲，因为它显然导致代码的整个混乱。

内联通过允许您将函数声明为 inline （至少在C ++中），解决了性能和可维护性问题， ，所以当你调用该函数 - 而不是让你的应用程序在运行时跳转 - 内联函数中的代码在编译时注入每次调用给定的函数。

这种情况的缺点是 - 如果你内联大功能，你调用了很多次 - 你的程序的大小可能会显着增加（最佳实践建议只做小功能） 。

I am referring to this discussion. I have never written any code in C or in C++ . I do not have any CS background. However I have been working as Java developer for 5 years and now I have decided to learn more about CS and do some catching up.

解决方案

When executing a given piece of code, whenever you call a standard function the execution time is slightly higher than dumping there the code contained into that function. Dumping every time the whole code contained in a function is on the other end unmainteinable because it obviously leads to a whole mess of duplication of code.

Inlining solves the performance and maintainability issue by letting you declare the function as inline (at least in C++), so that when you call that function - instead of having your app jumping around at runtime - the code in the inline function is injected at compile time every time that given function is called.

Downside of this is that - if you inline big functions which you call a lot of times - the size of your program may significantly increase (best practices suggest to do it only on small functions indeed).

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