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make the concepts portability macros slightly more maintainable #5817

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Merged
ericniebler merged 5 commits into from
Sep 10, 2025
Merged

make the concepts portability macros slightly more maintainable #5817

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eb55b37
make the concepts portability macros slightly more maintainable
ericniebler Sep 8, 2025
13cf487
work around issue with msvc's old broken preprocessor
ericniebler Sep 9, 2025
b1cf45b
roll back unnecessary change to preprocessor library
ericniebler Sep 9, 2025
e26a511
fix formatting and spelling
ericniebler Sep 9, 2025
eaa353b
fix one more test
ericniebler Sep 9, 2025
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8 changes: 8 additions & 0 deletions libcudacxx/include/cuda/std/__cccl/preprocessor.h
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,14 @@
#define _CCCL_PP_RBRACE() }
#define _CCCL_PP_COMMA_IIF(_Xp) _CCCL_PP_IIF(_Xp)(_CCCL_PP_COMMA, _CCCL_PP_EMPTY)()

#define _CCCL_PP_CASE(ARG) _CCCL_PP_PROBE_N(~, ARG)
#define _CCCL_PP_SWITCH(PREFIX, ...) \
_CCCL_PP_CAT(PREFIX##_CASE_, _CCCP_PP_CASE_LABEL_(PREFIX, __VA_ARGS__))(__VA_ARGS__)
#define _CCCL_PP_SWITCH2(PREFIX, ...) \
_CCCL_PP_CAT(PREFIX##_CASE_, _CCCP_PP_CASE_LABEL_(PREFIX, __VA_ARGS__))(__VA_ARGS__)
#define _CCCP_PP_CASE_LABEL_(PREFIX, ...) \
_CCCL_PP_EVAL(_CCCL_PP_CHECK, _CCCL_PP_CAT(PREFIX##_SWITCH_, _CCCL_PP_FIRST(__VA_ARGS__)), DEFAULT, )

#define _CCCL_PP_FOR_EACH(_Mp, ...) _CCCL_PP_FOR_EACH_N(_CCCL_PP_COUNT(__VA_ARGS__), _Mp, __VA_ARGS__)
#define _CCCL_PP_FOR_EACH_N(_Np, _Mp, ...) _CCCL_PP_CAT2(_CCCL_PP_FOR_EACH_, _Np)(_Mp, __VA_ARGS__)
#define _CCCL_PP_FOR_EACH_1(_Mp, _1) _Mp(_1)
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