memmove可重叠

void* __cdecl mmemmove(void* dst,const void* src,size_t size){assert(NULL != dst && NULL != src);char* memTo=(char*)dst;const char* memFrom=(const char*)src;if(memTo != memFrom){if(memTo>memFrom){//目标地址在源地址后面for(size_t i=size-1;i>=0;i--)//从后往前逐个拷贝{*(memTo+i)=*(memFrom+i);}}else{//目标地址在源地址前面for(size_t i=0;i<size;i++)//从前往后逐个拷贝{*(memTo+i)=*(memFrom+i);}}}return memTo;}