82 lines
3.2 KiB
C
82 lines
3.2 KiB
C
/*
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* Copyright (C) 2012 William Swanson
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or
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* their institutions shall not be used in advertising or otherwise to
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* promote the sale, use or other dealings in this Software without
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* prior written authorization from the authors.
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*/
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/*
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* Implements the higher-order Map function in the C Pre-Processor.
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*
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* Explanations available in [1,2,3].
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* Original source from [1].
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*
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* [1] https://github.com/swansontec/map-macro SHA:383c38e9
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* [2] http://jhnet.co.uk/articles/cpp_magic#turning-recursion-into-an-iterator
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* [3] https://en.wikipedia.org/wiki/Map_(higher-order_function)
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*/
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#ifndef EXT_DEBUG_CTF_CTF_MAP_H
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#define EXT_DEBUG_CTF_CTF_MAP_H
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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 /* EXT_DEBUG_CTF_CTF_MAP_H */
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