#include 
     
      #include 
      
       using namespace std;void* memmove(void *dst, const void *src, size_t count){	// 容错处理	if (dst == NULL || src == NULL){		return NULL;	}	unsigned char *pdst = (unsigned char *)dst;	const unsigned char *psrc = (const unsigned char *)src;	//推断内存是否重叠	bool flag1 = (pdst >= psrc && pdst < psrc + count);	bool flag2 = (psrc >= pdst && psrc < pdst + count);	if (flag1 || flag2){		// 倒序拷贝		while (count){			*(pdst + count - 1) = *(psrc + count - 1);			count--;		}//while	}	else{		// 拷贝		while (count--){			*pdst = *psrc;			pdst++;			psrc++;		}//while	}	return dst;}
      
     

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