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| author | David Lamparter <equinox@diac24.net> | 2019-06-21 10:58:02 +0200 |
|---|---|---|
| committer | David Lamparter <equinox@diac24.net> | 2019-09-03 17:15:17 +0200 |
| commit | 48373d46f1e82fb0413831fa85304cea5c1db766 (patch) | |
| tree | 693e765b1726c517afe03c35a363275a2f9e843c | |
| parent | Merge pull request #4888 from donaldsharp/rmap_cleanup (diff) | |
| download | frr-48373d46f1e82fb0413831fa85304cea5c1db766.tar.xz frr-48373d46f1e82fb0413831fa85304cea5c1db766.zip | |
lib: add some macro helpers
Macro soup, now with 50% more macros.
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
| -rw-r--r-- | lib/compiler.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/compiler.h b/lib/compiler.h index 6700ca9e8..e430925e6 100644 --- a/lib/compiler.h +++ b/lib/compiler.h @@ -121,6 +121,49 @@ extern "C" { #define macro_inline static inline __attribute__((unused)) #define macro_pure static inline __attribute__((unused, pure)) + +/* variadic macros, use like: + * #define V_0() ... + * #define V_1(x) ... + * #define V(...) MACRO_VARIANT(V, ##__VA_ARGS__)(__VA_ARGS__) + */ +#define _MACRO_VARIANT(A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10, N, ...) N + +#define _CONCAT2(a, b) a ## b +#define _CONCAT(a, b) _CONCAT2(a,b) + +#define MACRO_VARIANT(NAME, ...) \ + _CONCAT(NAME, _MACRO_VARIANT(0, ##__VA_ARGS__, \ + _10, _9, _8, _7, _6, _5, _4, _3, _2, _1, _0)) + +#define NAMECTR(name) _CONCAT(name, __COUNTER__) + +/* per-arg repeat macros, use like: + * #define PERARG(n) ...n... + * #define FOO(...) MACRO_REPEAT(PERARG, ##__VA_ARGS__) + */ + +#define _MACRO_REPEAT_0(NAME) +#define _MACRO_REPEAT_1(NAME, A1) \ + NAME(A1) +#define _MACRO_REPEAT_2(NAME, A1, A2) \ + NAME(A1) NAME(A2) +#define _MACRO_REPEAT_3(NAME, A1, A2, A3) \ + NAME(A1) NAME(A2) NAME(A3) +#define _MACRO_REPEAT_4(NAME, A1, A2, A3, A4) \ + NAME(A1) NAME(A2) NAME(A3) NAME(A4) +#define _MACRO_REPEAT_5(NAME, A1, A2, A3, A4, A5) \ + NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) +#define _MACRO_REPEAT_6(NAME, A1, A2, A3, A4, A5, A6) \ + NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6) +#define _MACRO_REPEAT_7(NAME, A1, A2, A3, A4, A5, A6, A7) \ + NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6) NAME(A7) +#define _MACRO_REPEAT_8(NAME, A1, A2, A3, A4, A5, A6, A7, A8) \ + NAME(A1) NAME(A2) NAME(A3) NAME(A4) NAME(A5) NAME(A6) NAME(A7) NAME(A8) + +#define MACRO_REPEAT(NAME, ...) \ + MACRO_VARIANT(_MACRO_REPEAT, ##__VA_ARGS__)(NAME, ##__VA_ARGS__) + /* * for warnings on macros, put in the macro content like this: * #define MACRO BLA CPP_WARN("MACRO has been deprecated") |