这个预编译是什么意思 帮忙看一下
#ifdef USE_FULL_ASSERT
#define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__))
void assert_failed(uint8_t* file, uint32_t line);
#else
#define assert_param(expr) ((void)0)
#endif
#endif
