目标C-如何编写宏 [英] Objective C - How to write a macro
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问题描述
我需要写多行宏.我需要这个,因为我必须有部分代码已经被粘贴"到具体的点在我的代码.我该怎么办?
I need to write a multi-line macro. I need this because I must have partial code that has been "paste" into specific points in my code. How can I do this?
推荐答案
这不是真的从你的问题明确你真正想要的东西,而是一个普通的多行的宏定义如下:
It's not really clear from your question what you actually want, but a plain multi-line macro is defined as follows:
#define FOO something; \
something_else;
当然,当心
Of course, beware of the if .. else
problem. If this is applicable to your case, you could wrap things into a do { ... } while(0)
construct. This will ensure that it's treated as a single statement.
#define FOO do \
{ \
something; \
something_else; \
} while (0)
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