Objective-C中的static，extern和inline [英] Static, extern and inline in Objective-C

问题描述

使用LLVM编译器在Objetive-C中static，extern和inline(及其组合)是什么意思?

What do static, extern and inline (and their combinations) mean in Objetive-C using the LLVM compiler?

此外，我注意到有CG_EXTERN和CG_INLINE宏.我们应该改用那些吗?

Also, I noticed that there are CG_EXTERN and CG_INLINE macros. Should we be using those instead?

(我找不到明确说明的资源，因此我认为在此处创建一个源可能有用，或者如果有人知道一个源，则指向它)

推荐答案

使用LLVM编译器在Objetive-C中，static，extern和inline(及其组合)是什么意思?

What do static, extern and inline (and their combinations) mean in Objetive-C using the LLVM compiler?

与C中的相同，除非您以ObjC ++的形式进行编译-否则它们的含义与C ++中的相同.

The same as in C, unless you compile as ObjC++ -- then they mean the same as found in C++.

所以这里是C的简介，但是如果您准备使用这些链接，则请阅读这些链接，因为这些细节很重要:

So here is an introduction for C, but read the links if you are ready to use these because the details are important:

外部

摘要:表示在其他地方定义了一个标识符.

详细信息: http://tigcc.ticalc.org/doc/keywords.html#外部

静态

摘要(值):保留变量值以使其作用域结束后仍然存在.

摘要(函数):有效地发出未命名的副本-对于C语言中的私有函数很有用，当与内联函数一起使用时，可用于避免多个定义错误.

Summary (function): Effectively emits unnamed copies - useful for private functions in C, and can be used to escape multiple definition errors when used with inline functions.

详细信息: http://tigcc.ticalc.org/doc/keywords.html#静态

内联

摘要:建议将函数主体移入调用方中.

Summary: Suggests the body of a function should be moved into the callers.

详细信息: http://tigcc.ticalc.org/doc/gnuexts.html# SEC93

请注意，内联和静态在C ++中要复杂得多(类似于C ++中的几乎所有内容).

Note that inline and static are quite a bit more complex in C++ (like pretty much everything in C++).

我还发现有CG_EXTERN和CG_INLINE宏.我们应该改用那些吗?

I also found that there are CG_EXTERN and CG_INLINE macros. Should we be using those instead?

否.

相反，如果需要这种功能，则应使用自己的意思指定自己的名称. CG_EXTERN和CG_INLINE具有特定含义(可能会发生变化)，并且打算在其定义的上下文中使用-而且，您也不想包含一整套框架(所有CoreGraphics/ApplicationServices/要在C和C ++中使用某种方式指定extern，则需要指定CoreFoundation等.

Instead, you should specify your own, with your own meanings, if you need this type of functionality. CG_EXTERN and CG_INLINE have specific meanings (which may change), and are meant to be used in their defined context -- also, you don't want to have to include a whole handful of frameworks (all CoreGraphics/ApplicationServices/CoreFoundation/etc.) when you want to specify something is extern in a way that works in C and C++.

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