303   size_t CopySize = Rand(ToSize - ToBeg) + 1;  in CopyPartOf()  local
304   assert(ToBeg + CopySize <= ToSize);  in CopyPartOf()
305   CopySize = std::min(CopySize, FromSize);  in CopyPartOf()
306   size_t FromBeg = Rand(FromSize - CopySize + 1);  in CopyPartOf()
307   assert(FromBeg + CopySize <= FromSize);  in CopyPartOf()
308   memmove(To + ToBeg, From + FromBeg, CopySize);  in CopyPartOf()
320   size_t CopySize = Rand(MaxCopySize) + 1;  in InsertPartOf()  local
321   size_t FromBeg = Rand(FromSize - CopySize + 1);  in InsertPartOf()
322   assert(FromBeg + CopySize <= FromSize);  in InsertPartOf()
324   assert(ToInsertPos + CopySize <= MaxToSize);  in InsertPartOf()
328     memcpy(MutateInPlaceHere.data(), From + FromBeg, CopySize);  in InsertPartOf()
329     memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);  in InsertPartOf()
330     memmove(To + ToInsertPos, MutateInPlaceHere.data(), CopySize);  in InsertPartOf()
332     memmove(To + ToInsertPos + CopySize, To + ToInsertPos, TailSize);  in InsertPartOf()
333     memmove(To + ToInsertPos, From + FromBeg, CopySize);  in InsertPartOf()
335   return ToSize + CopySize;  in InsertPartOf()