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谁能说下宏到底是什么。。。

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Release： 2016-06-06 20:16:37
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谁能说下宏到底是什么。。。

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谁能说下宏到底是什么。。。

宏就是一个常量或一段简单代码的别名，预编译的时候会替换过来。

就是全局定义的不变的量

贴一下我以前的一个回答：
https://segmentfault.com/q/1010000004440006/a-1020000004440131

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