22 struct GCBits  struct
24     alias size_t wordtype;
26     enum BITS_PER_WORD = (wordtype.sizeof * 8);
27     enum BITS_SHIFT = (wordtype.sizeof == 8 ? 6 : 5);
28     enum BITS_MASK = (BITS_PER_WORD - 1);
29     enum BITS_1 = cast(wordtype)1;
31     wordtype* data;
32     size_t nbits;
34     void Dtor() nothrow  in Dtor()
43     void alloc(size_t nbits) nothrow  in alloc()
51     wordtype test(size_t i) const nothrow  in test()
61     int set(size_t i) nothrow  in set()
86     void copy(GCBits *f) nothrow  in copy()  argument
104     GCBits b;  argument