forked from 3rd-party/fff
50 lines
1.4 KiB
Ruby
50 lines
1.4 KiB
Ruby
$MAX_ARGS = 20
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#{ $MAX_ARGS.times {|arg_count| '_' + arg_count.to_s }
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def generate_reverse_arg_sequence(args)
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(0..args).flat_map {|i| ['_' + i.to_s]}.join(", ")
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end
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def generate_arg_sequence(args, prefix, do_reverse)
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fmap = (0..args).flat_map {|i| [prefix + i.to_s]}
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if do_reverse then fmap.reverse.join(", ") else fmap.join(", ") end
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end
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def output_macro_counting_shortcuts
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puts <<-MACRO_COUNTING
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#define PP_NARG_MINUS2(...) \
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PP_NARG_MINUS2_(__VA_ARGS__, PP_RSEQ_N_MINUS2())
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#define PP_NARG_MINUS2_(...) \
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PP_ARG_MINUS2_N(__VA_ARGS__)
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#define PP_ARG_MINUS2_N(returnVal, _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, N, ...) N
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#define PP_ARG_MINUS2_N(returnVal, #{ generate_arg_sequence($MAX_ARGS - 1, '_', false) }, N, ...) N
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#define PP_RSEQ_N_MINUS2() \
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19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0
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#define PP_RSEQ_N_MINUS2() \
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#{ generate_arg_sequence($MAX_ARGS - 1, '', true) }
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#define FAKE_VALUE_FUNC(...) \
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FUNC_VALUE_(PP_NARG_MINUS2(__VA_ARGS__), __VA_ARGS__)
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#define FUNC_VALUE_(N,...) \
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FUNC_VALUE_N(N,__VA_ARGS__)
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#define FUNC_VALUE_N(N,...) \
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FAKE_VALUE_FUNC ## N(__VA_ARGS__)
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MACRO_COUNTING
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end
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puts generate_arg_sequence($MAX_ARGS, '', false)
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puts generate_arg_sequence($MAX_ARGS, '_', false)
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puts generate_arg_sequence($MAX_ARGS, '', true)
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puts generate_arg_sequence($MAX_ARGS, '_', true)
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output_macro_counting_shortcuts |