54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Created by William Swanson in 2012.
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*
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* I, William Swanson, dedicate this work to the public domain.
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* I waive all rights to the work worldwide under copyright law,
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* including all related and neighboring rights,
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* to the extent allowed by law.
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*
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* You can copy, modify, distribute and perform the work,
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* even for commercial purposes, all without asking permission.
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*/
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#ifndef MAP_H_INCLUDED
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#define MAP_H_INCLUDED
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#define EVAL0(...) __VA_ARGS__
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#define EVAL1(...) EVAL0(EVAL0(EVAL0(__VA_ARGS__)))
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#define EVAL2(...) EVAL1(EVAL1(EVAL1(__VA_ARGS__)))
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#define EVAL3(...) EVAL2(EVAL2(EVAL2(__VA_ARGS__)))
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#define EVAL4(...) EVAL3(EVAL3(EVAL3(__VA_ARGS__)))
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#define EVAL(...) EVAL4(EVAL4(EVAL4(__VA_ARGS__)))
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#define MAP_END(...)
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#define MAP_OUT
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#define MAP_COMMA ,
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#define MAP_GET_END2() 0, MAP_END
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#define MAP_GET_END1(...) MAP_GET_END2
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#define MAP_GET_END(...) MAP_GET_END1
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#define MAP_NEXT0(test, next, ...) next MAP_OUT
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#define MAP_NEXT1(test, next) MAP_NEXT0(test, next, 0)
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#define MAP_NEXT(test, next) MAP_NEXT1(MAP_GET_END test, next)
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#define MAP0(f, x, peek, ...) f(x) MAP_NEXT(peek, MAP1)(f, peek, __VA_ARGS__)
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#define MAP1(f, x, peek, ...) f(x) MAP_NEXT(peek, MAP0)(f, peek, __VA_ARGS__)
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#define MAP_LIST_NEXT1(test, next) MAP_NEXT0(test, MAP_COMMA next, 0)
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#define MAP_LIST_NEXT(test, next) MAP_LIST_NEXT1(MAP_GET_END test, next)
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#define MAP_LIST0(f, x, peek, ...) f(x) MAP_LIST_NEXT(peek, MAP_LIST1)(f, peek, __VA_ARGS__)
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#define MAP_LIST1(f, x, peek, ...) f(x) MAP_LIST_NEXT(peek, MAP_LIST0)(f, peek, __VA_ARGS__)
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/**
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* Applies the function macro `f` to each of the remaining parameters.
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*/
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#define MAP(f, ...) EVAL(MAP1(f, __VA_ARGS__, ()()(), ()()(), ()()(), 0))
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/**
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* Applies the function macro `f` to each of the remaining parameters and
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* inserts commas between the results.
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*/
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#define MAP_LIST(f, ...) EVAL(MAP_LIST1(f, __VA_ARGS__, ()()(), ()()(), ()()(), 0))
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#endif |