| // Copyright 2019 The Abseil Authors. |
| // |
| // 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 |
| // |
| // https://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. |
| // |
| // ----------------------------------------------------------------------------- |
| // transform_args.h |
| // ----------------------------------------------------------------------------- |
| // |
| // This file contains a higher-order macro that "transforms" each element of a |
| // a variadic argument by a provided secondary macro. |
| |
| #ifndef ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_ |
| #define ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_ |
| |
| // |
| // ABSL_INTERNAL_CAT(a, b) |
| // |
| // This macro takes two arguments and concatenates them together via ## after |
| // expansion. |
| // |
| // Example: |
| // |
| // ABSL_INTERNAL_CAT(foo_, bar) |
| // |
| // Results in: |
| // |
| // foo_bar |
| #define ABSL_INTERNAL_CAT(a, b) ABSL_INTERNAL_CAT_IMPL(a, b) |
| #define ABSL_INTERNAL_CAT_IMPL(a, b) a##b |
| |
| // |
| // ABSL_INTERNAL_TRANSFORM_ARGS(m, ...) |
| // |
| // This macro takes another macro as an argument followed by a trailing series |
| // of additional parameters (up to 32 additional arguments). It invokes the |
| // passed-in macro once for each of the additional arguments, with the |
| // expansions separated by commas. |
| // |
| // Example: |
| // |
| // ABSL_INTERNAL_TRANSFORM_ARGS(MY_MACRO, a, b, c) |
| // |
| // Results in: |
| // |
| // MY_MACRO(a), MY_MACRO(b), MY_MACRO(c) |
| // |
| // TODO(calabrese) Handle no arguments as a special case. |
| #define ABSL_INTERNAL_TRANSFORM_ARGS(m, ...) \ |
| ABSL_INTERNAL_CAT(ABSL_INTERNAL_TRANSFORM_ARGS, \ |
| ABSL_INTERNAL_NUM_ARGS(__VA_ARGS__)) \ |
| (m, __VA_ARGS__) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS1(m, a0) m(a0) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS2(m, a0, a1) m(a0), m(a1) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS3(m, a0, a1, a2) m(a0), m(a1), m(a2) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS4(m, a0, a1, a2, a3) \ |
| m(a0), m(a1), m(a2), m(a3) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS5(m, a0, a1, a2, a3, a4) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS6(m, a0, a1, a2, a3, a4, a5) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS7(m, a0, a1, a2, a3, a4, a5, a6) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS8(m, a0, a1, a2, a3, a4, a5, a6, a7) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS9(m, a0, a1, a2, a3, a4, a5, a6, a7, a8) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS10(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS11(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), m(a10) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS12(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS13(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS14(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS15(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS16(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS17(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS18(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS19(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS20(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS21(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS22(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20, a21) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS23(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20, a21, a22) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS24(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20, a21, a22, a23) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS25(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20, a21, a22, a23, a24) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS26( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS27( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS28( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS29( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \ |
| m(a28) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS30( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \ |
| m(a28), m(a29) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS31( \ |
| m, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, \ |
| a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \ |
| m(a28), m(a29), m(a30) |
| |
| #define ABSL_INTERNAL_TRANSFORM_ARGS32(m, a0, a1, a2, a3, a4, a5, a6, a7, a8, \ |
| a9, a10, a11, a12, a13, a14, a15, a16, \ |
| a17, a18, a19, a20, a21, a22, a23, a24, \ |
| a25, a26, a27, a28, a29, a30, a31) \ |
| m(a0), m(a1), m(a2), m(a3), m(a4), m(a5), m(a6), m(a7), m(a8), m(a9), \ |
| m(a10), m(a11), m(a12), m(a13), m(a14), m(a15), m(a16), m(a17), m(a18), \ |
| m(a19), m(a20), m(a21), m(a22), m(a23), m(a24), m(a25), m(a26), m(a27), \ |
| m(a28), m(a29), m(a30), m(a31) |
| |
| #define ABSL_INTERNAL_NUM_ARGS_IMPL(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, \ |
| a10, a11, a12, a13, a14, a15, a16, a17, \ |
| a18, a19, a20, a21, a22, a23, a24, a25, \ |
| a26, a27, a28, a29, a30, a31, result, ...) \ |
| result |
| |
| #define ABSL_INTERNAL_FORCE_EXPANSION(...) __VA_ARGS__ |
| |
| #define ABSL_INTERNAL_NUM_ARGS(...) \ |
| ABSL_INTERNAL_FORCE_EXPANSION(ABSL_INTERNAL_NUM_ARGS_IMPL( \ |
| __VA_ARGS__, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, \ |
| 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, )) |
| |
| #endif // ABSL_TYPES_INTERNAL_TRANSFORM_ARGS_H_ |
