“在线”的有用性特点 [英] Usefulness of the "inline" feature

问题描述

内联有两个方面：

• inline 关键字将被忽略如果编译器确定函数不能内联。


• 有一个编译器优化（在Visual Studio上，我不知道GCC），告诉编译器内联所有函数。

从这里我得出结论，我从来不需要麻烦内联。

或者是否有任何情况下会优先使用手动内联？

< inline 关键字有两个函数：

• 它可以作为编译器执行内联优化的提示（这在现代编译器上基本上是无用的，它在有或没有关键字的情况下内联）


• 它告诉编译器/链接器忽略一个定义规则： inline 'd符号可以在多个翻译单元中定义（通常是因为它定义在头部，包括多个文件）。通常，这将导致链接器错误，但是当您使用 inline 关键字时允许。

There's two things about inlining:

• The inline keyword will be ignored if the compiler determines that the function cannot be inlined.
• There is a compiler optimization (on Visual Studio, I don't know about GCC) that tells the compiler to inline all functions where possible.

From this I conclude that I never need to bother about inlining. I just have to turn on the compiler optimization for the release build.

Or are there any situations where manually inlining would be preferred?

解决方案

The inline keyword has two functions:

• it serves as a hint to the compiler to perform the inlining optimization (this is basically useless on modern compilers, which inline aggressively with or without the keyword)
• it tells the compiler/linker to ignore the One Definition Rule: that the inline'd symbol may be defined in multiple translation units (typically because it is defined in a header, that is included from multiple files). Normally, this would result in a linker error, but it is allowed when you use the inline keyword.

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