有关宏定义的问题

huwenjian

typedef enum
{ Bit_RESET = 0,
  Bit_SET
}BitAction;

#define IS_GPIO_BIT_ACTION(ACTION) (((ACTION) == Bit_RESET) || ((ACTION) == Bit_SET))

不知道#define IS_GPIO_BIT_ACTION(ACTION) (((ACTION) == Bit_RESET) || ((ACTION) == Bit_SET))是什么意思？

fire

关于宏定义的用法 - C语言资料区 - 野火初学123论坛 http://www.firebbs.cn/forum.php? ... &extra=page%3D1

楼主先看看上面的帖子

fire

[code=cpp]#define IS_GPIO_BIT_ACTION(ACTION) (((ACTION) == Bit_RESET) || ((ACTION) == Bit_SET))[/code]

实际上就是调用 IS_GPIO_BIT_ACTION(ACTION)
会被替换成 (((ACTION) == Bit_RESET) || ((ACTION) == Bit_SET))