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34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
17 years ago
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#ifndef _VA_NARG_H
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#define _VA_NARG_H
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/* Idea from Laurent Deniau,
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* http://groups.google.com/group/comp.std.c/browse_thread/thread/77ee8c8f92e4a3fb/346fc464319b1ee5?lnk=st&q=&rnum=1#346fc464319b1ee5
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*/
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/* The __VA_NARG__ macro returns the number of arguments that have been
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* passed to it.
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*/
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#define __VA_NARG__(...) \
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PP_NARG_(__VA_ARGS__,PP_RSEQ_N())
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#define PP_NARG_(...) \
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PP_ARG_N(__VA_ARGS__)
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#define PP_ARG_N( \
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_1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
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_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
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_21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
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_31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
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_41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
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_51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
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_61,_62,_63,N,...) N
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#define PP_RSEQ_N() \
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63,62,61,60, \
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59,58,57,56,55,54,53,52,51,50, \
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49,48,47,46,45,44,43,42,41,40, \
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39,38,37,36,35,34,33,32,31,30, \
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29,28,27,26,25,24,23,22,21,20, \
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19,18,17,16,15,14,13,12,11,10, \
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9,8,7,6,5,4,3,2,1,0
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#endif
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