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Revision fa090c4e include/arrow.h

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include/arrow.h
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struct _arrow_mem {struct _arrow_reg {_Bool _first; } _reg; };
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extern struct _arrow_mem *arrow_alloc ();
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extern struct _arrow_mem *_arrow_alloc ();
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#define _arrow_DECLARE(inst)\
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  struct _arrow_mem inst;
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#define _arrow_DECLARE(attr, inst)\
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  attr struct _arrow_mem inst;
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#define _arrow_LINK(inst) do {\
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  ;\
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} while (0)
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#define _arrow_ALLOC(attr, inst)\
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  _arrow_DECLARE(attr, inst);\
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  _arrow_LINK(inst)
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#define _arrow_step(x,y,output,self) ((self)->_reg._first?((self)->_reg._first=0,(*output = x)):(*output = y))
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#define _arrow_reset(self) {(self)->_reg._first = 1;}

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