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- #pragma once
- /*
- * The PP_NARG macro evaluates to the number of arguments that have been
- * passed to it.
- *
- * Laurent Deniau, "__VA_NARG__," 17 January 2006, <comp.std.c> (29 November 2007).
- * https://groups.google.com/forum/?fromgroups=#!topic/comp.std.c/d-6Mj5Lko_s
- */
- // Added workaround for silly MSVC bug that yields "too few parameters" warning.
- // - Alf
- #include <progrock/cppx/macro/invoke.h> // CPPX_INVOKE
- #define PP_ARG_N( \
- _1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
- _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
- _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
- _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
- _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
- _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
- _61,_62,_63,N,...) N
- #define PP_RSEQ_N() \
- 63,62,61,60, \
- 59,58,57,56,55,54,53,52,51,50, \
- 49,48,47,46,45,44,43,42,41,40, \
- 39,38,37,36,35,34,33,32,31,30, \
- 29,28,27,26,25,24,23,22,21,20, \
- 19,18,17,16,15,14,13,12,11,10, \
- 9,8,7,6,5,4,3,2,1,0
- #if 0
- #define PP_NARG_(...) PP_ARG_N( __VA_ARGS__ )
- #define PP_NARG( ...) PP_NARG_( __VA_ARGS__, PP_RSEQ_N() )
- #else
- #define PP_NARG_(...) CPPX_INVOKE( PP_ARG_N, (__VA_ARGS__) )
- #define PP_NARG(...) PP_NARG_(__VA_ARGS__,PP_RSEQ_N())
- #endif
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