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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
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#ifndef MACRO_UTILS_H
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#define MACRO_UTILS_H
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#define CALL(m, ...) m(__VA_ARGS__)
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#define EMPTY()
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#define EVAL(...) EVAL32(__VA_ARGS__)
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#define EVAL1024(...) EVAL512(EVAL512(__VA_ARGS__))
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#define EVAL512(...) EVAL256(EVAL256(__VA_ARGS__))
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#define EVAL256(...) EVAL128(EVAL128(__VA_ARGS__))
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#define EVAL128(...) EVAL64(EVAL64(__VA_ARGS__))
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#define EVAL64(...) EVAL32(EVAL32(__VA_ARGS__))
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#define EVAL32(...) EVAL16(EVAL16(__VA_ARGS__))
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#define EVAL16(...) EVAL8(EVAL8(__VA_ARGS__))
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#define EVAL8(...) EVAL4(EVAL4(__VA_ARGS__))
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#define EVAL4(...) EVAL2(EVAL2(__VA_ARGS__))
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#define EVAL2(...) EVAL1(EVAL1(__VA_ARGS__))
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#define EVAL1(...) __VA_ARGS__
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#define EVAL0(...)
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#define SND(a, b, ...) b
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#define FST(a, ...) a
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#define CAT(a, b) a##b
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#define PROBE() ~, 1
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#define IS_PROBE(...) SND(__VA_ARGS__, 0)
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// _FAST_NOT(0) -> 1 _FAST_NOT(1) -> 0
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#define _FAST_NOT(x) CAT(_FAST_NOT_, x)()
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#define _FAST_NOT_0() 1
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#define _FAST_NOT_1() 0
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// NOT(0) -> 1 NOT(...) -> 0
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#define NOT(x) IS_PROBE(CAT(_NOT_, x))
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#define _NOT_0 PROBE()
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// BOOL(0) -> 0 BOOL(...) -> 1
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#define BOOL(x) _FAST_NOT(NOT(x))
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// Same as EVAL1 but different meaning
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#define KEEP(...) __VA_ARGS__
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// Drop / Delete the arguments
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#define DROP(...)
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#define IF_ELSE(c) FAST_IF_ELSE(BOOL(c))
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// IF_ELSE if c is know to be 0 or 1
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#define FAST_IF_ELSE(c) CAT(_IF_ELSE_, c)
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#define _IF_ELSE_0(...) KEEP
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#define _IF_ELSE_1(...) __VA_ARGS__ DROP
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#define HAS_ARGS(...) BOOL(FST(_HAS_ARGS_ __VA_ARGS__)())
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#define _HAS_ARGS_() 0
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#define IF_ELSE_ARGS(...) FAST_IF_ELSE(HAS_ARGS(__VA_ARGS__))
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#define DEFER1(x) x EMPTY()
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#define DEFER2(x) x EMPTY EMPTY()()
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#define DEFER3(x) x EMPTY EMPTY EMPTY()()()
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#define DEFER4(x) x EMPTY EMPTY EMPTY EMPTY()()()()
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#define DEFER5(x) x EMPTY EMPTY EMPTY EMPTY EMPTY()()()()()
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#define MAP(m, fst, ...) m(fst) __VA_OPT__(DEFER1(_MAP)()(DEFER1(m), __VA_ARGS__))
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#define _MAP() MAP
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#define REVERSE(...) IF_ELSE_ARGS(__VA_ARGS__)(EVAL(_REVERSE(__VA_ARGS__)))()
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#define _REVERSE(a, ...) __VA_OPT__(DEFER1(__REVERSE)()(__VA_ARGS__), ) a
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#define __REVERSE() _REVERSE
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#endif
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