/* * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Copyright 2012-2016 Danny Robson */ #ifndef __UTIL_PREPROCESSOR_HPP #define __UTIL_PREPROCESSOR_HPP #define PASTE_DETAIL(x, y) x##y #define PASTE(x, y) PASTE_DETAIL(x, y) #define PASTE_LIST(x,y) PASTE(x,y), #define NAMESPACE_LIST(x,y) x::y, #define STRINGIZE_DETAIL(x) #x #define STRINGIZE(x) STRINGIZE_DETAIL(x) #define STRINGIZE_LIST(x) STRINGIZE(x), #define STATIC_ASSERT(MSG) static_assert(false, MSG); /////////////////////////////////////////////////////////////////////////////// // Varags functional style map // // Based off a technique seen on StackOverflow: // http://stackoverflow.com/questions/11761703/overloading-macro-on-number-of-arguments #define MAP_0_01(F, X) F(X) #define MAP_0_02(F, X, ...) F(X)MAP_0_01(F, __VA_ARGS__) #define MAP_0_03(F, X, ...) F(X)MAP_0_02(F, __VA_ARGS__) #define MAP_0_04(F, X, ...) F(X)MAP_0_03(F, __VA_ARGS__) #define MAP_0_05(F, X, ...) F(X)MAP_0_04(F, __VA_ARGS__) #define MAP_0_06(F, X, ...) F(X)MAP_0_05(F, __VA_ARGS__) #define MAP_0_07(F, X, ...) F(X)MAP_0_06(F, __VA_ARGS__) #define MAP_0_08(F, X, ...) F(X)MAP_0_07(F, __VA_ARGS__) #define MAP_0_09(F, X, ...) F(X)MAP_0_08(F, __VA_ARGS__) #define MAP_0_10(F, X, ...) F(X)MAP_0_09(F, __VA_ARGS__) #define MAP_0_11(F, X, ...) F(X)MAP_0_10(F, __VA_ARGS__) #define MAP_0_12(F, X, ...) F(X)MAP_0_11(F, __VA_ARGS__) #define MAP_0_13(F, X, ...) F(X)MAP_0_12(F, __VA_ARGS__) #define MAP_0_14(F, X, ...) F(X)MAP_0_13(F, __VA_ARGS__) #define MAP_0_15(F, X, ...) F(X)MAP_0_14(F, __VA_ARGS__) #define MAP_0_16(F, X, ...) F(X)MAP_0_15(F, __VA_ARGS__) #define MAP_0_17(F, X, ...) F(X)MAP_0_16(F, __VA_ARGS__) #define MAP_0_18(F, X, ...) F(X)MAP_0_17(F, __VA_ARGS__) #define MAP_0_19(F, X, ...) F(X)MAP_0_18(F, __VA_ARGS__) #define MAP_0_20(F, X, ...) F(X)MAP_0_19(F, __VA_ARGS__) #define MAP_0_21(F, X, ...) F(X)MAP_0_20(F, __VA_ARGS__) #define MAP_0_22(F, X, ...) F(X)MAP_0_21(F, __VA_ARGS__) #define MAP_0_23(F, X, ...) F(X)MAP_0_22(F, __VA_ARGS__) #define MAP_0_24(F, X, ...) F(X)MAP_0_23(F, __VA_ARGS__) #define MAP_1_01(F, A, X) F(A, X) #define MAP_1_02(F, A, X, ...) F(A, X)MAP_1_01(F, A, __VA_ARGS__) #define MAP_1_03(F, A, X, ...) F(A, X)MAP_1_02(F, A, __VA_ARGS__) #define MAP_1_04(F, A, X, ...) F(A, X)MAP_1_03(F, A, __VA_ARGS__) #define MAP_1_05(F, A, X, ...) F(A, X)MAP_1_04(F, A, __VA_ARGS__) #define MAP_1_06(F, A, X, ...) F(A, X)MAP_1_05(F, A, __VA_ARGS__) #define MAP_1_07(F, A, X, ...) F(A, X)MAP_1_06(F, A, __VA_ARGS__) #define MAP_1_08(F, A, X, ...) F(A, X)MAP_1_07(F, A, __VA_ARGS__) #define MAP_1_09(F, A, X, ...) F(A, X)MAP_1_08(F, A, __VA_ARGS__) #define MAP_1_10(F, A, X, ...) F(A, X)MAP_1_09(F, A, __VA_ARGS__) #define MAP_1_11(F, A, X, ...) F(A, X)MAP_1_10(F, A, __VA_ARGS__) #define MAP_1_12(F, A, X, ...) F(A, X)MAP_1_11(F, A, __VA_ARGS__) #define MAP_1_13(F, A, X, ...) F(A, X)MAP_1_12(F, A, __VA_ARGS__) #define MAP_1_14(F, A, X, ...) F(A, X)MAP_1_13(F, A, __VA_ARGS__) #define MAP_1_15(F, A, X, ...) F(A, X)MAP_1_14(F, A, __VA_ARGS__) #define MAP_1_16(F, A, X, ...) F(A, X)MAP_1_15(F, A, __VA_ARGS__) #define MAP_1_17(F, A, X, ...) F(A, X)MAP_1_16(F, A, __VA_ARGS__) #define MAP_1_18(F, A, X, ...) F(A, X)MAP_1_17(F, A, __VA_ARGS__) #define MAP_1_19(F, A, X, ...) F(A, X)MAP_1_18(F, A, __VA_ARGS__) #define MAP_1_20(F, A, X, ...) F(A, X)MAP_1_19(F, A, __VA_ARGS__) #define MAP_1_21(F, A, X, ...) F(A, X)MAP_1_20(F, A, __VA_ARGS__) #define MAP_1_22(F, A, X, ...) F(A, X)MAP_1_21(F, A, __VA_ARGS__) #define MAP_1_23(F, A, X, ...) F(A, X)MAP_1_22(F, A, __VA_ARGS__) #define MAP_1_24(F, A, X, ...) F(A, X)MAP_1_23(F, A, __VA_ARGS__) // Uses the sliding pairs dispatch technique: by passing __VA_ARGS__ as the // first set of variables and appending (reverse orderred) names of the // corresponding macros, we get the name of the correct arity macro. // // Ensure this is called with at least N+2 parameters otherwise GCC in // particular will complain about requiring at least one value for varargs #define ARITY_DISPATCH( \ _01,_02,_03,_04,_05,_06,_07,_08, \ _09,_10,_11,_12,_13,_14,_15,_16, \ _17,_18,_19,_20,_21,_22,_23,_24, \ NAME,... \ ) NAME // Map a macro across __VA_ARGS__. Can be easily expanded, but has non-obvious // failure mode when supported arity is exceeded. // // Don't use this, unless you really need the stringize operator, or other // macro magic. // // Just use templates. Really... #define MAP(FUNC,...) \ ARITY_DISPATCH(__VA_ARGS__, \ MAP_0_24, MAP_0_23, MAP_0_22, MAP_0_21, MAP_0_20, MAP_0_19, MAP_0_18, MAP_0_17, \ MAP_0_16, MAP_0_15, MAP_0_14, MAP_0_13, MAP_0_12, MAP_0_11, MAP_0_10, MAP_0_09, \ MAP_0_08, MAP_0_07, MAP_0_06, MAP_0_05, MAP_0_04, MAP_0_03, MAP_0_02, MAP_0_01, \ STATIC_ASSERT("invalid arity for MAP") \ )(FUNC, __VA_ARGS__) #define MAP1(FUNC,...) \ ARITY_DISPATCH(__VA_ARGS__, \ MAP_1_23, MAP_1_22, MAP_1_21, MAP_1_20, MAP_1_19, MAP_1_18, MAP_1_17, \ MAP_1_16, MAP_1_15, MAP_1_14, MAP_1_13, MAP_1_12, MAP_1_11, MAP_1_10, MAP_1_09, \ MAP_1_08, MAP_1_07, MAP_1_06, MAP_1_05, MAP_1_04, MAP_1_03, MAP_1_02, MAP_1_01, \ STATIC_ASSERT("invalid arity for MAP1") \ )(FUNC, __VA_ARGS__) #define LITERAL_00 0 #define LITERAL_01 1 #define LITERAL_02 2 #define LITERAL_03 3 #define LITERAL_04 4 #define LITERAL_05 5 #define LITERAL_06 6 #define LITERAL_07 7 #define LITERAL_08 8 #define LITERAL_09 9 #define LITERAL_10 10 #define LITERAL_11 11 #define LITERAL_12 12 #define LITERAL_13 13 #define LITERAL_14 14 #define LITERAL_15 15 #define LITERAL_16 16 #define LITERAL_17 17 #define LITERAL_18 18 #define LITERAL_19 19 #define LITERAL_20 20 #define LITERAL_21 21 #define LITERAL_22 22 #define LITERAL_23 23 #define LITERAL_24 24 #define VA_ARGS_COUNT(...) \ ARITY_DISPATCH(__VA_ARGS__, \ LITERAL_24, LITERAL_23, LITERAL_22, LITERAL_21, \ LITERAL_20, LITERAL_19, LITERAL_18, LITERAL_17, \ LITERAL_16, LITERAL_15, LITERAL_14, LITERAL_13, \ LITERAL_12, LITERAL_11, LITERAL_10, LITERAL_09, \ LITERAL_08, LITERAL_07, LITERAL_06, LITERAL_05, \ LITERAL_04, LITERAL_03, LITERAL_02, LITERAL_01, \ STATIC_ASSERT("invalid value for VA_ARGS_COUNT")\ ) #endif