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Diffstat (limited to 'mfbt/MacroForEach.h')
| -rw-r--r-- | mfbt/MacroForEach.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/mfbt/MacroForEach.h b/mfbt/MacroForEach.h new file mode 100644 index 0000000000..7c0e3cfbb5 --- /dev/null +++ b/mfbt/MacroForEach.h @@ -0,0 +1,158 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * Implements a higher-order macro for iteratively calling another macro with + * fixed leading arguments, plus a trailing element picked from a second list + * of arguments. + */ + +#ifndef mozilla_MacroForEach_h +#define mozilla_MacroForEach_h + +#include "mozilla/MacroArgs.h" + +/* + * MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) expands to N calls to the macro + * |aMacro| where N is equal the number of items in the list |aArgs|. The + * arguments for each |aMacro| call are composed of *all* arguments in the list + * |aFixedArgs| as well as a single argument in the list |aArgs|. For example: + * + * #define MACRO_A(x) x + + * int a = MOZ_FOR_EACH(MACRO_A, (), (1, 2, 3)) 0; + * // Expands to: MACRO_A(1) MACRO_A(2) MACRO_A(3) 0; + * // And further to: 1 + 2 + 3 + 0; + * + * #define MACRO_B(k, x) (k + x) + + * int b = MOZ_FOR_EACH(MACRO_B, (5,), (1, 2)) 0; + * // Expands to: MACRO_B(5, 1) MACRO_B(5, 2) 0; + * + * #define MACRO_C(k1, k2, x) (k1 + k2 + x) + + * int c = MOZ_FOR_EACH(MACRO_C, (5, 8,), (1, 2)) 0; + * // Expands to: MACRO_B(5, 8, 1) MACRO_B(5, 8, 2) 0; + * + * If the |aFixedArgs| list is not empty, a trailing comma must be included. + * + * The |aArgs| list must be not be empty and may be up to 50 items long. Use + * MOZ_STATIC_ASSERT_VALID_ARG_COUNT to ensure that violating this constraint + * results in a compile-time error. + */ +#define MOZ_FOR_EACH_EXPAND_HELPER(...) __VA_ARGS__ +#define MOZ_FOR_EACH_GLUE(a, b) a b +#define MOZ_FOR_EACH(aMacro, aFixedArgs, aArgs) \ + MOZ_FOR_EACH_GLUE( \ + MOZ_PASTE_PREFIX_AND_ARG_COUNT(MOZ_FOR_EACH_, \ + MOZ_FOR_EACH_EXPAND_HELPER aArgs), \ + (aMacro, aFixedArgs, aArgs)) + +#define MOZ_FOR_EACH_HELPER_GLUE(a, b) a b +#define MOZ_FOR_EACH_HELPER(aMacro, aFixedArgs, aArgs) \ + MOZ_FOR_EACH_HELPER_GLUE( \ + aMacro, \ + (MOZ_FOR_EACH_EXPAND_HELPER aFixedArgs MOZ_ARG_1 aArgs)) + +#define MOZ_FOR_EACH_1(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) +#define MOZ_FOR_EACH_2(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_1(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_3(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_2(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_4(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_3(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_5(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_4(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_6(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_5(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_7(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_6(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_8(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_7(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_9(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_8(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_10(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_9(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_11(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_10(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_12(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_11(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_13(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_12(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_14(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_13(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_15(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_14(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_16(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_15(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_17(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_16(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_18(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_17(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_19(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_18(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_20(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_19(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_21(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_20(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_22(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_21(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_23(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_22(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_24(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_23(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_25(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_24(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_26(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_25(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_27(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_26(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_28(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_27(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_29(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_28(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_30(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_29(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_31(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_30(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_32(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_31(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_33(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_32(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_34(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_33(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_35(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_34(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_36(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_35(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_37(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_36(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_38(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_37(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_39(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_38(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_40(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_39(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_41(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_40(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_42(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_41(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_43(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_42(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_44(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_43(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_45(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_44(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_46(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_45(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_47(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_46(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_48(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_47(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_49(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_48(m, fa, (MOZ_ARGS_AFTER_1 a)) +#define MOZ_FOR_EACH_50(m, fa, a) \ + MOZ_FOR_EACH_HELPER(m, fa, a) MOZ_FOR_EACH_49(m, fa, (MOZ_ARGS_AFTER_1 a)) + +#endif /* mozilla_MacroForEach_h */ |