21 struct GCBits  struct
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);
33     wordtype* data;
34     size_t nbits;
63     wordtype test(size_t i) const nothrow  in test()
73     int set(size_t i) nothrow  in set()
83     int clear(size_t i) nothrow  in clear()
94     size_t setLocked(size_t i) nothrow  in setLocked()
157     template testAndSet(bool locked)  in testAndSet()
166     mixin template RangeVars()  in RangeVars()
176     void clearWords(size_t firstWord, size_t lastWord) nothrow  in clearWords()
182     void setWords(size_t firstWord, size_t lastWord) nothrow  in setWords()
188     void copyWords(size_t firstWord, size_t lastWord, const(wordtype)* source) nothrow  in copyWords()
194 …pyWordsShifted(size_t firstWord, size_t cntWords, size_t firstOff, const(wordtype)* source) nothrow  in copyWordsShifted()
204     void copyRange(size_t target, size_t len, const(wordtype)* source) nothrow  in copyRange()
221     void copyRangeZ(size_t target, size_t len, const(wordtype)* source) nothrow  in copyRangeZ()
248 …opyRangeRepeating(size_t target, size_t destlen, const(wordtype)* source, size_t sourcelen) nothrow  in copyRangeRepeating()
276         GCBits bits;  argument
280         GCBits src;  argument
293     void setRange(size_t target, size_t len) nothrow  in setRange()
307     void setRangeZ(size_t target, size_t len) nothrow  in setRangeZ()
325     void clrRange(size_t target, size_t len) nothrow  in clrRange()
358         GCBits bits;  argument
360         auto data = bits.data;
450     void copy(GCBits *f) nothrow  in copy()  argument
468     GCBits b;  argument