MacroForEach.h (10689B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* 8 * Implements a higher-order macro for iteratively calling another macro with 9 * fixed leading arguments, plus a trailing element picked from a second list 10 * of arguments. 11 */ 12 13 #ifndef mozilla_MacroForEach_h 14 #define mozilla_MacroForEach_h 15 16 #include "mozilla/MacroArgs.h" 17 18 /* 19 * MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) expands to N calls to the macro 20 * |aMacro| where N is equal the number of items in the list |aArgs|. The 21 * arguments for each |aMacro| call are composed of *all* arguments in the list 22 * |aFixedArgs| as well as a single argument in the list |aArgs|. For example: 23 * 24 * #define MACRO_A(x) x + 25 * int a = MOZ_FOR_EACH(MACRO_A, (), (1, 2, 3)) 0; 26 * // Expands to: MACRO_A(1) MACRO_A(2) MACRO_A(3) 0; 27 * // And further to: 1 + 2 + 3 + 0; 28 * 29 * #define MACRO_B(k, x) (k + x) + 30 * int b = MOZ_FOR_EACH(MACRO_B, (5,), (1, 2)) 0; 31 * // Expands to: MACRO_B(5, 1) MACRO_B(5, 2) 0; 32 * 33 * #define MACRO_C(k1, k2, x) (k1 + k2 + x) + 34 * int c = MOZ_FOR_EACH(MACRO_C, (5, 8,), (1, 2)) 0; 35 * // Expands to: MACRO_B(5, 8, 1) MACRO_B(5, 8, 2) 0; 36 * 37 * MOZ_FOR_EACH_SEPARATED(aMacro, aSeparator, aFixedArgs, aArgs) is identical 38 * to MOZ_FOR_EACH except that it inserts |aSeparator| between each call to 39 * the macro. |aSeparator| must be wrapped by parens. For example: 40 * 41 * #define MACRO_A(x) x 42 * int a = MOZ_FOR_EACH_SEPARATED(MACRO_A, (+), (), (1, 2, 3)); 43 * // Expands to: MACRO_A(1) + MACRO_A(2) + MACRO_A(3); 44 * // And further to: 1 + 2 + 3 45 * 46 * #define MACRO_B(t, n) t n 47 * void test(MOZ_FOR_EACH_SEPARATED(MACRO_B, (,), (int,), (a, b))); 48 * // Expands to: void test(MACRO_B(int, a) , MACRO_B(int, b)); 49 * // And further to: void test(int a , int b); 50 * 51 * If the |aFixedArgs| list is not empty, a trailing comma must be included. 52 * 53 * The |aArgs| list may be up to 50 items long. 54 */ 55 #define MOZ_FOR_EACH_EXPAND_HELPER(...) __VA_ARGS__ 56 #define MOZ_FOR_EACH_GLUE(a, b) a b 57 #define MOZ_FOR_EACH_SEPARATED(aMacro, aSeparator, aFixedArgs, aArgs) \ 58 MOZ_FOR_EACH_GLUE(MOZ_PASTE_PREFIX_AND_ARG_COUNT( \ 59 MOZ_FOR_EACH_, MOZ_FOR_EACH_EXPAND_HELPER aArgs), \ 60 (aMacro, aSeparator, aFixedArgs, aArgs)) 61 #define MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) \ 62 MOZ_FOR_EACH_SEPARATED(aMacro, (), aFixedArgs, aArgs) 63 64 #define MOZ_FOR_EACH_HELPER_GLUE(a, b) a b 65 #define MOZ_FOR_EACH_HELPER(aMacro, aFixedArgs, aArgs) \ 66 MOZ_FOR_EACH_HELPER_GLUE( \ 67 aMacro, (MOZ_FOR_EACH_EXPAND_HELPER aFixedArgs MOZ_ARG_1 aArgs)) 68 69 #define MOZ_FOR_EACH_0(m, s, fa, a) 70 #define MOZ_FOR_EACH_1(m, s, fa, a) MOZ_FOR_EACH_HELPER(m, fa, a) 71 #define MOZ_FOR_EACH_2(m, s, fa, a) \ 72 MOZ_FOR_EACH_HELPER(m, fa, a) \ 73 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_1(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 74 #define MOZ_FOR_EACH_3(m, s, fa, a) \ 75 MOZ_FOR_EACH_HELPER(m, fa, a) \ 76 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_2(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 77 #define MOZ_FOR_EACH_4(m, s, fa, a) \ 78 MOZ_FOR_EACH_HELPER(m, fa, a) \ 79 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_3(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 80 #define MOZ_FOR_EACH_5(m, s, fa, a) \ 81 MOZ_FOR_EACH_HELPER(m, fa, a) \ 82 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_4(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 83 #define MOZ_FOR_EACH_6(m, s, fa, a) \ 84 MOZ_FOR_EACH_HELPER(m, fa, a) \ 85 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_5(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 86 #define MOZ_FOR_EACH_7(m, s, fa, a) \ 87 MOZ_FOR_EACH_HELPER(m, fa, a) \ 88 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_6(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 89 #define MOZ_FOR_EACH_8(m, s, fa, a) \ 90 MOZ_FOR_EACH_HELPER(m, fa, a) \ 91 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_7(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 92 #define MOZ_FOR_EACH_9(m, s, fa, a) \ 93 MOZ_FOR_EACH_HELPER(m, fa, a) \ 94 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_8(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 95 #define MOZ_FOR_EACH_10(m, s, fa, a) \ 96 MOZ_FOR_EACH_HELPER(m, fa, a) \ 97 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_9(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 98 #define MOZ_FOR_EACH_11(m, s, fa, a) \ 99 MOZ_FOR_EACH_HELPER(m, fa, a) \ 100 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_10(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 101 #define MOZ_FOR_EACH_12(m, s, fa, a) \ 102 MOZ_FOR_EACH_HELPER(m, fa, a) \ 103 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_11(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 104 #define MOZ_FOR_EACH_13(m, s, fa, a) \ 105 MOZ_FOR_EACH_HELPER(m, fa, a) \ 106 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_12(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 107 #define MOZ_FOR_EACH_14(m, s, fa, a) \ 108 MOZ_FOR_EACH_HELPER(m, fa, a) \ 109 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_13(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 110 #define MOZ_FOR_EACH_15(m, s, fa, a) \ 111 MOZ_FOR_EACH_HELPER(m, fa, a) \ 112 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_14(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 113 #define MOZ_FOR_EACH_16(m, s, fa, a) \ 114 MOZ_FOR_EACH_HELPER(m, fa, a) \ 115 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_15(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 116 #define MOZ_FOR_EACH_17(m, s, fa, a) \ 117 MOZ_FOR_EACH_HELPER(m, fa, a) \ 118 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_16(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 119 #define MOZ_FOR_EACH_18(m, s, fa, a) \ 120 MOZ_FOR_EACH_HELPER(m, fa, a) \ 121 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_17(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 122 #define MOZ_FOR_EACH_19(m, s, fa, a) \ 123 MOZ_FOR_EACH_HELPER(m, fa, a) \ 124 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_18(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 125 #define MOZ_FOR_EACH_20(m, s, fa, a) \ 126 MOZ_FOR_EACH_HELPER(m, fa, a) \ 127 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_19(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 128 #define MOZ_FOR_EACH_21(m, s, fa, a) \ 129 MOZ_FOR_EACH_HELPER(m, fa, a) \ 130 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_20(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 131 #define MOZ_FOR_EACH_22(m, s, fa, a) \ 132 MOZ_FOR_EACH_HELPER(m, fa, a) \ 133 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_21(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 134 #define MOZ_FOR_EACH_23(m, s, fa, a) \ 135 MOZ_FOR_EACH_HELPER(m, fa, a) \ 136 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_22(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 137 #define MOZ_FOR_EACH_24(m, s, fa, a) \ 138 MOZ_FOR_EACH_HELPER(m, fa, a) \ 139 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_23(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 140 #define MOZ_FOR_EACH_25(m, s, fa, a) \ 141 MOZ_FOR_EACH_HELPER(m, fa, a) \ 142 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_24(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 143 #define MOZ_FOR_EACH_26(m, s, fa, a) \ 144 MOZ_FOR_EACH_HELPER(m, fa, a) \ 145 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_25(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 146 #define MOZ_FOR_EACH_27(m, s, fa, a) \ 147 MOZ_FOR_EACH_HELPER(m, fa, a) \ 148 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_26(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 149 #define MOZ_FOR_EACH_28(m, s, fa, a) \ 150 MOZ_FOR_EACH_HELPER(m, fa, a) \ 151 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_27(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 152 #define MOZ_FOR_EACH_29(m, s, fa, a) \ 153 MOZ_FOR_EACH_HELPER(m, fa, a) \ 154 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_28(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 155 #define MOZ_FOR_EACH_30(m, s, fa, a) \ 156 MOZ_FOR_EACH_HELPER(m, fa, a) \ 157 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_29(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 158 #define MOZ_FOR_EACH_31(m, s, fa, a) \ 159 MOZ_FOR_EACH_HELPER(m, fa, a) \ 160 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_30(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 161 #define MOZ_FOR_EACH_32(m, s, fa, a) \ 162 MOZ_FOR_EACH_HELPER(m, fa, a) \ 163 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_31(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 164 #define MOZ_FOR_EACH_33(m, s, fa, a) \ 165 MOZ_FOR_EACH_HELPER(m, fa, a) \ 166 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_32(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 167 #define MOZ_FOR_EACH_34(m, s, fa, a) \ 168 MOZ_FOR_EACH_HELPER(m, fa, a) \ 169 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_33(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 170 #define MOZ_FOR_EACH_35(m, s, fa, a) \ 171 MOZ_FOR_EACH_HELPER(m, fa, a) \ 172 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_34(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 173 #define MOZ_FOR_EACH_36(m, s, fa, a) \ 174 MOZ_FOR_EACH_HELPER(m, fa, a) \ 175 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_35(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 176 #define MOZ_FOR_EACH_37(m, s, fa, a) \ 177 MOZ_FOR_EACH_HELPER(m, fa, a) \ 178 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_36(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 179 #define MOZ_FOR_EACH_38(m, s, fa, a) \ 180 MOZ_FOR_EACH_HELPER(m, fa, a) \ 181 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_37(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 182 #define MOZ_FOR_EACH_39(m, s, fa, a) \ 183 MOZ_FOR_EACH_HELPER(m, fa, a) \ 184 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_38(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 185 #define MOZ_FOR_EACH_40(m, s, fa, a) \ 186 MOZ_FOR_EACH_HELPER(m, fa, a) \ 187 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_39(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 188 #define MOZ_FOR_EACH_41(m, s, fa, a) \ 189 MOZ_FOR_EACH_HELPER(m, fa, a) \ 190 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_40(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 191 #define MOZ_FOR_EACH_42(m, s, fa, a) \ 192 MOZ_FOR_EACH_HELPER(m, fa, a) \ 193 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_41(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 194 #define MOZ_FOR_EACH_43(m, s, fa, a) \ 195 MOZ_FOR_EACH_HELPER(m, fa, a) \ 196 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_42(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 197 #define MOZ_FOR_EACH_44(m, s, fa, a) \ 198 MOZ_FOR_EACH_HELPER(m, fa, a) \ 199 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_43(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 200 #define MOZ_FOR_EACH_45(m, s, fa, a) \ 201 MOZ_FOR_EACH_HELPER(m, fa, a) \ 202 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_44(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 203 #define MOZ_FOR_EACH_46(m, s, fa, a) \ 204 MOZ_FOR_EACH_HELPER(m, fa, a) \ 205 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_45(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 206 #define MOZ_FOR_EACH_47(m, s, fa, a) \ 207 MOZ_FOR_EACH_HELPER(m, fa, a) \ 208 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_46(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 209 #define MOZ_FOR_EACH_48(m, s, fa, a) \ 210 MOZ_FOR_EACH_HELPER(m, fa, a) \ 211 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_47(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 212 #define MOZ_FOR_EACH_49(m, s, fa, a) \ 213 MOZ_FOR_EACH_HELPER(m, fa, a) \ 214 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_48(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 215 #define MOZ_FOR_EACH_50(m, s, fa, a) \ 216 MOZ_FOR_EACH_HELPER(m, fa, a) \ 217 MOZ_FOR_EACH_EXPAND_HELPER s MOZ_FOR_EACH_49(m, s, fa, (MOZ_ARGS_AFTER_1 a)) 218 219 #endif /* mozilla_MacroForEach_h */