75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2012-2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_PREPROCESSOR_HPP
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#define __UTIL_PREPROCESSOR_HPP
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#define PASTE_DETAIL(x, y) x##y
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#define PASTE(x, y) PASTE_DETAIL(x, y)
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#define STRINGIZE_DETAIL(x) #x
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#define STRINGIZE(x) STRINGIZE_DETAIL(x)
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#define STRINGIZE_LIST(x) STRINGIZE(x),
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///////////////////////////////////////////////////////////////////////////////
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// Varags functional style map
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//
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// Based off a technique seen on StackOverflow:
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// http://stackoverflow.com/questions/11761703/overloading-macro-on-number-of-arguments
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#define MAP_01(F, X) F(X)
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#define MAP_02(F, X, ...) F(X)MAP_01(F, __VA_ARGS__)
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#define MAP_03(F, X, ...) F(X)MAP_02(F, __VA_ARGS__)
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#define MAP_04(F, X, ...) F(X)MAP_03(F, __VA_ARGS__)
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#define MAP_05(F, X, ...) F(X)MAP_04(F, __VA_ARGS__)
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#define MAP_06(F, X, ...) F(X)MAP_05(F, __VA_ARGS__)
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#define MAP_07(F, X, ...) F(X)MAP_06(F, __VA_ARGS__)
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#define MAP_08(F, X, ...) F(X)MAP_07(F, __VA_ARGS__)
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#define MAP_09(F, X, ...) F(X)MAP_08(F, __VA_ARGS__)
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#define MAP_10(F, X, ...) F(X)MAP_09(F, __VA_ARGS__)
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#define MAP_11(F, X, ...) F(X)MAP_10(F, __VA_ARGS__)
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#define MAP_12(F, X, ...) F(X)MAP_11(F, __VA_ARGS__)
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#define MAP_13(F, X, ...) F(X)MAP_12(F, __VA_ARGS__)
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#define MAP_14(F, X, ...) F(X)MAP_13(F, __VA_ARGS__)
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#define MAP_15(F, X, ...) F(X)MAP_14(F, __VA_ARGS__)
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#define MAP_16(F, X, ...) F(X)MAP_15(F, __VA_ARGS__)
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// Uses the sliding pairs dispatch technique: by passing __VA_ARGS__ as the
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// first set of variables and appending (reverse orderred) names of the
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// corresponding macros, we get the name of the correct arity macro.
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#define ARITY_DISPATCH( \
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_01,_02,_03,_04,_05,_06,_07,_08, \
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_09,_10,_11,_12,_13,_14,_15,_16, \
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NAME,... \
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) NAME
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// Map a macro across __VA_ARGS__. Can be easily expanded, but has non-obvious
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// failure mode when supported arity is exceeded. Don't use this, unless you
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// really need the stringize operator, or other macro magic.
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//
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// Just use C++ templates. Really...
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#define MAP(FUNC,...) \
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ARITY_DISPATCH(__VA_ARGS__, \
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MAP_16, MAP_15, MAP_14, MAP_13, MAP_12, MAP_11, MAP_10, MAP_09, \
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MAP_08, MAP_07, MAP_06, MAP_05, MAP_04, MAP_03, MAP_02, MAP_01 \
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)(FUNC, __VA_ARGS__)
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#endif
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