Question

关于stm32的一个 宏定义函数

这个函数如何理解呀？如何实现参数检测的？
#ifdef DEBUG
/*******************************************************************************
* Macro Name : assert_param
* Description : The assert_param macro is used for function's parameters check.
* It is used only if the library is compiled in DEBUG mode.
* Input : - expr: If expr is false, it calls assert_failed function
* which reports the name of the source file and the source
* line number of the call that failed.
* If expr is true, it returns no value.
* Return : None
*******************************************************************************/
#define assert_param(expr) ((expr) ? (void)0 : assert_failed((u8 *)__FILE__, __LINE__))
/* Exported functions ------------------------------------------------------- */
void assert_failed(u8* file, u32 line);
#else
#define assert_param(expr) ((void)0)
#endif /* DEBUG */

Answer 1

assert_是断言，主要是检查参数正步正确

追问

是如何检测的呢？可否说明一下呢？

Answer 2

……