258   unsigned Capacity; // Size of allocated memory in BitWord.  variable
308       : Size(0), Capacity(0), Alloc(std::move(A)) {
316     Capacity = NumBitWords(s);  in Size()
317     Bits = Alloc.allocate(Capacity);  in Size()
318     init_words(Bits, Capacity, t);  in Size()
327       Capacity = 0;  in BitVectorTmpl()
331     Capacity = NumBitWords(RHS.size());  in BitVectorTmpl()
332     Bits = Alloc.allocate(Capacity);  in BitVectorTmpl()
333     std::memcpy(Bits, RHS.Bits, Capacity * sizeof(BitWord));  in BitVectorTmpl()
337       : Bits(RHS.Bits), Size(RHS.Size), Capacity(RHS.Capacity),  in BitVectorTmpl()
344       Alloc.deallocate(Bits, Capacity);  in ~BitVectorTmpl()
423     if (N > Capacity * BITWORD_SIZE) {
424       unsigned OldCapacity = Capacity;
426       init_words(&Bits[OldCapacity], (Capacity - OldCapacity), t);
443     if (N > Capacity * BITWORD_SIZE)  in reserve()
449     init_words(Bits, Capacity, true);  in set()
491     init_words(Bits, Capacity, false);  in reset()
657     if (Size <= Capacity * BITWORD_SIZE) {
668     assert(Capacity == 0);
671     const auto OldCapacity = Capacity;
672     Capacity = RHSWords;
673     assert(Capacity > 0 && "negative capacity?");
674     BitWord *NewBits = Alloc.allocate(Capacity);
675     std::memcpy(NewBits, RHS.Bits, Capacity * sizeof(BitWord));
688     Alloc.deallocate(Bits, Capacity);
691     Capacity = RHS.Capacity;
701     std::swap(Capacity, RHS.Capacity);  in swap()
749     if (Capacity > UsedWords)
750       init_words(&Bits[UsedWords], (Capacity - UsedWords), t);
767     const auto OldCapacity = Capacity;  in grow()
768     Capacity = std::max(NumBitWords(NewSize), Capacity * 2);  in grow()
769     assert(Capacity > 0 && "realloc-ing zero space");  in grow()
770     auto *NewBits = Alloc.allocate(Capacity);  in grow()