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 * If the |aFixedArgs| list is not empty, a trailing comma must be included. 38 * 39 * The |aArgs| list must be not be empty and may be up to 50 items long. Use 40 * MOZ_STATIC_ASSERT_VALID_ARG_COUNT to ensure that violating this constraint 41 * results in a compile-time error. 42 */ 43 #define MOZ_FOR_EACH_EXPAND_HELPER(...) __VA_ARGS__ 44 #define MOZ_FOR_EACH_GLUE(a, b) a b 45 #define MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) \ 46 MOZ_FOR_EACH_GLUE( \ 47 MOZ_PASTE_PREFIX_AND_ARG_COUNT(MOZ_FOR_EACH_, \ 48 MOZ_FOR_EACH_EXPAND_HELPER aArgs), \ 49 (aMacro, aFixedArgs, aArgs)) 50 51 #define MOZ_FOR_EACH_HELPER_GLUE(a, b) a b 52 #define MOZ_FOR_EACH_HELPER(aMacro, aFixedArgs, aArgs) \ 53 MOZ_FOR_EACH_HELPER_GLUE( \ 54 aMacro, \ 55 (MOZ_FOR_EACH_EXPAND_HELPER aFixedArgs MOZ_ARG_1 aArgs)) 56 57 #define MOZ_FOR_EACH_1(m, fa, a) \ 58 MOZ_FOR_EACH_HELPER(m, fa, a) 59 #define MOZ_FOR_EACH_2(m, fa, a) \ 60 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_1(m, fa, (MOZ_ARGS_AFTER_1 a)) 61 #define MOZ_FOR_EACH_3(m, fa, a) \ 62 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_2(m, fa, (MOZ_ARGS_AFTER_1 a)) 63 #define MOZ_FOR_EACH_4(m, fa, a) \ 64 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_3(m, fa, (MOZ_ARGS_AFTER_1 a)) 65 #define MOZ_FOR_EACH_5(m, fa, a) \ 66 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_4(m, fa, (MOZ_ARGS_AFTER_1 a)) 67 #define MOZ_FOR_EACH_6(m, fa, a) \ 68 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_5(m, fa, (MOZ_ARGS_AFTER_1 a)) 69 #define MOZ_FOR_EACH_7(m, fa, a) \ 70 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_6(m, fa, (MOZ_ARGS_AFTER_1 a)) 71 #define MOZ_FOR_EACH_8(m, fa, a) \ 72 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_7(m, fa, (MOZ_ARGS_AFTER_1 a)) 73 #define MOZ_FOR_EACH_9(m, fa, a) \ 74 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_8(m, fa, (MOZ_ARGS_AFTER_1 a)) 75 #define MOZ_FOR_EACH_10(m, fa, a) \ 76 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_9(m, fa, (MOZ_ARGS_AFTER_1 a)) 77 #define MOZ_FOR_EACH_11(m, fa, a) \ 78 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_10(m, fa, (MOZ_ARGS_AFTER_1 a)) 79 #define MOZ_FOR_EACH_12(m, fa, a) \ 80 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_11(m, fa, (MOZ_ARGS_AFTER_1 a)) 81 #define MOZ_FOR_EACH_13(m, fa, a) \ 82 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_12(m, fa, (MOZ_ARGS_AFTER_1 a)) 83 #define MOZ_FOR_EACH_14(m, fa, a) \ 84 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_13(m, fa, (MOZ_ARGS_AFTER_1 a)) 85 #define MOZ_FOR_EACH_15(m, fa, a) \ 86 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_14(m, fa, (MOZ_ARGS_AFTER_1 a)) 87 #define MOZ_FOR_EACH_16(m, fa, a) \ 88 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_15(m, fa, (MOZ_ARGS_AFTER_1 a)) 89 #define MOZ_FOR_EACH_17(m, fa, a) \ 90 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_16(m, fa, (MOZ_ARGS_AFTER_1 a)) 91 #define MOZ_FOR_EACH_18(m, fa, a) \ 92 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_17(m, fa, (MOZ_ARGS_AFTER_1 a)) 93 #define MOZ_FOR_EACH_19(m, fa, a) \ 94 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_18(m, fa, (MOZ_ARGS_AFTER_1 a)) 95 #define MOZ_FOR_EACH_20(m, fa, a) \ 96 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_19(m, fa, (MOZ_ARGS_AFTER_1 a)) 97 #define MOZ_FOR_EACH_21(m, fa, a) \ 98 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_20(m, fa, (MOZ_ARGS_AFTER_1 a)) 99 #define MOZ_FOR_EACH_22(m, fa, a) \ 100 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_21(m, fa, (MOZ_ARGS_AFTER_1 a)) 101 #define MOZ_FOR_EACH_23(m, fa, a) \ 102 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_22(m, fa, (MOZ_ARGS_AFTER_1 a)) 103 #define MOZ_FOR_EACH_24(m, fa, a) \ 104 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_23(m, fa, (MOZ_ARGS_AFTER_1 a)) 105 #define MOZ_FOR_EACH_25(m, fa, a) \ 106 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_24(m, fa, (MOZ_ARGS_AFTER_1 a)) 107 #define MOZ_FOR_EACH_26(m, fa, a) \ 108 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_25(m, fa, (MOZ_ARGS_AFTER_1 a)) 109 #define MOZ_FOR_EACH_27(m, fa, a) \ 110 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_26(m, fa, (MOZ_ARGS_AFTER_1 a)) 111 #define MOZ_FOR_EACH_28(m, fa, a) \ 112 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_27(m, fa, (MOZ_ARGS_AFTER_1 a)) 113 #define MOZ_FOR_EACH_29(m, fa, a) \ 114 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_28(m, fa, (MOZ_ARGS_AFTER_1 a)) 115 #define MOZ_FOR_EACH_30(m, fa, a) \ 116 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_29(m, fa, (MOZ_ARGS_AFTER_1 a)) 117 #define MOZ_FOR_EACH_31(m, fa, a) \ 118 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_30(m, fa, (MOZ_ARGS_AFTER_1 a)) 119 #define MOZ_FOR_EACH_32(m, fa, a) \ 120 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_31(m, fa, (MOZ_ARGS_AFTER_1 a)) 121 #define MOZ_FOR_EACH_33(m, fa, a) \ 122 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_32(m, fa, (MOZ_ARGS_AFTER_1 a)) 123 #define MOZ_FOR_EACH_34(m, fa, a) \ 124 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_33(m, fa, (MOZ_ARGS_AFTER_1 a)) 125 #define MOZ_FOR_EACH_35(m, fa, a) \ 126 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_34(m, fa, (MOZ_ARGS_AFTER_1 a)) 127 #define MOZ_FOR_EACH_36(m, fa, a) \ 128 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_35(m, fa, (MOZ_ARGS_AFTER_1 a)) 129 #define MOZ_FOR_EACH_37(m, fa, a) \ 130 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_36(m, fa, (MOZ_ARGS_AFTER_1 a)) 131 #define MOZ_FOR_EACH_38(m, fa, a) \ 132 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_37(m, fa, (MOZ_ARGS_AFTER_1 a)) 133 #define MOZ_FOR_EACH_39(m, fa, a) \ 134 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_38(m, fa, (MOZ_ARGS_AFTER_1 a)) 135 #define MOZ_FOR_EACH_40(m, fa, a) \ 136 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_39(m, fa, (MOZ_ARGS_AFTER_1 a)) 137 #define MOZ_FOR_EACH_41(m, fa, a) \ 138 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_40(m, fa, (MOZ_ARGS_AFTER_1 a)) 139 #define MOZ_FOR_EACH_42(m, fa, a) \ 140 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_41(m, fa, (MOZ_ARGS_AFTER_1 a)) 141 #define MOZ_FOR_EACH_43(m, fa, a) \ 142 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_42(m, fa, (MOZ_ARGS_AFTER_1 a)) 143 #define MOZ_FOR_EACH_44(m, fa, a) \ 144 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_43(m, fa, (MOZ_ARGS_AFTER_1 a)) 145 #define MOZ_FOR_EACH_45(m, fa, a) \ 146 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_44(m, fa, (MOZ_ARGS_AFTER_1 a)) 147 #define MOZ_FOR_EACH_46(m, fa, a) \ 148 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_45(m, fa, (MOZ_ARGS_AFTER_1 a)) 149 #define MOZ_FOR_EACH_47(m, fa, a) \ 150 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_46(m, fa, (MOZ_ARGS_AFTER_1 a)) 151 #define MOZ_FOR_EACH_48(m, fa, a) \ 152 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_47(m, fa, (MOZ_ARGS_AFTER_1 a)) 153 #define MOZ_FOR_EACH_49(m, fa, a) \ 154 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_48(m, fa, (MOZ_ARGS_AFTER_1 a)) 155 #define MOZ_FOR_EACH_50(m, fa, a) \ 156 MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_49(m, fa, (MOZ_ARGS_AFTER_1 a)) 157 158 #endif /* mozilla_MacroForEach_h */ 159