问题描述
我想问一下在 Objective C 项目中使用FOUNDATION_EXPORT而不是extern的原因是什么.
I would like to ask what's the reason behind using FOUNDATION_EXPORT instead of extern in Objective C projects.
我已经检查了这个问题，并使用FOUNDATION_EXPORT获得了高达340分(第一名)，而仅使用extern 74分(第二名).
I've checked this question and using FOUNDATION_EXPORT has earned whopping 340 points (1st place) whereas using extern only 74 points (2nd place).
有人可以解释为什么吗?使用FOUNDATION_EXPORT代替extern有什么实际的理由吗?
Could anybody explain why? Is there any practical reason for using FOUNDATION_EXPORT instead of extern?
谢谢！
推荐答案
如果查看NSObjCRuntime.h(在Foundation中)，您会看到FOUNDATION_EXPORT在C中编译为extern，在C ++中编译为extern "C"，并且Win32中的其他内容.因此，它更具兼容性.对于大多数项目，这没有任何区别.
If you look in NSObjCRuntime.h (in Foundation) you will see that FOUNDATION_EXPORT compiles to extern in C, extern "C" in C++, and other things in Win32. So, it's a bit more compatible. For most projects, this won't make any difference.
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