#if defined 等宏义的用法

热度：7 发布时间：2024-02-02 05:45:08.0

用法1：

#if defined (ENABLE_OUTPUT_DEBUG_MSG) && !defined (POWER_SAVING)

表示，如果定义宏 ENABLE_OUTPUT_DEBUG_MSG，并且不定义宏 POWER_SAVING，才执行里面的东西。

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