// 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_