321   size_t CopySize = Rand(ToSize - ToBeg) + 1;  in CopyPartOf()  local
322   assert(ToBeg + CopySize <= ToSize);  in CopyPartOf()
323   CopySize = std::min(CopySize, FromSize);  in CopyPartOf()
324   size_t FromBeg = Rand(FromSize - CopySize + 1);  in CopyPartOf()
325   assert(FromBeg + CopySize <= FromSize);  in CopyPartOf()
326   memmove(To + ToBeg, From + FromBeg, CopySize);  in CopyPartOf()
338   size_t CopySize = Rand(MaxCopySize) + 1;  in InsertPartOf()  local
339   size_t FromBeg = Rand(FromSize - CopySize + 1);  in InsertPartOf()
340   assert(FromBeg + CopySize <= FromSize);  in InsertPartOf()
342   assert(ToInsertPos + CopySize <= MaxToSize);  in InsertPartOf()
346     memcpy(MutateInPlaceHere.data(), From + FromBeg, CopySize);  in InsertPartOf()
347     memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);  in InsertPartOf()
348     memmove(To + ToInsertPos, MutateInPlaceHere.data(), CopySize);  in InsertPartOf()
350     memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);  in InsertPartOf()
351     memmove(To + ToInsertPos, From + FromBeg, CopySize);  in InsertPartOf()
353   return ToSize + CopySize;  in InsertPartOf()