| // Copyright 2022 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef SRC_TINT_UTILS_MACROS_FOREACH_H_ |
| #define SRC_TINT_UTILS_MACROS_FOREACH_H_ |
| |
| // Macro magic to perform macro variadic dispatch. |
| // See: |
| // https://renenyffenegger.ch/notes/development/languages/C-C-plus-plus/preprocessor/macros/__VA_ARGS__/count-arguments |
| // Note, this doesn't attempt to use the ##__VA_ARGS__ trick to handle 0 |
| |
| // Helper macro to force expanding __VA_ARGS__ to satisfy MSVC compiler. |
| #define TINT_MSVC_EXPAND_BUG(X) X |
| |
| /// TINT_COUNT_ARGUMENTS_NTH_ARG is used by TINT_COUNT_ARGUMENTS to get the number of arguments in a |
| /// variadic macro call. |
| #define TINT_COUNT_ARGUMENTS_NTH_ARG(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, \ |
| _15, _16, N, ...) \ |
| N |
| |
| /// TINT_COUNT_ARGUMENTS evaluates to the number of arguments passed to the macro |
| #define TINT_COUNT_ARGUMENTS(...) \ |
| TINT_MSVC_EXPAND_BUG(TINT_COUNT_ARGUMENTS_NTH_ARG(__VA_ARGS__, 16, 15, 14, 13, 12, 11, 10, 9, \ |
| 8, 7, 6, 5, 4, 3, 2, 1, 0)) |
| |
| // Correctness checks. |
| static_assert(1 == TINT_COUNT_ARGUMENTS(a), "TINT_COUNT_ARGUMENTS broken"); |
| static_assert(2 == TINT_COUNT_ARGUMENTS(a, b), "TINT_COUNT_ARGUMENTS broken"); |
| static_assert(3 == TINT_COUNT_ARGUMENTS(a, b, c), "TINT_COUNT_ARGUMENTS broken"); |
| |
| /// TINT_FOREACH calls CB with each of the variadic arguments. |
| #define TINT_FOREACH(CB, ...) \ |
| TINT_MSVC_EXPAND_BUG( \ |
| TINT_CONCAT(TINT_FOREACH_, TINT_COUNT_ARGUMENTS(__VA_ARGS__))(CB, __VA_ARGS__)) |
| |
| #define TINT_FOREACH_1(CB, _1) CB(_1) |
| #define TINT_FOREACH_2(CB, _1, _2) \ |
| TINT_FOREACH_1(CB, _1) \ |
| CB(_2) |
| #define TINT_FOREACH_3(CB, _1, _2, _3) \ |
| TINT_FOREACH_2(CB, _1, _2) \ |
| CB(_3) |
| #define TINT_FOREACH_4(CB, _1, _2, _3, _4) \ |
| TINT_FOREACH_3(CB, _1, _2, _3) \ |
| CB(_4) |
| #define TINT_FOREACH_5(CB, _1, _2, _3, _4, _5) \ |
| TINT_FOREACH_4(CB, _1, _2, _3, _4) \ |
| CB(_5) |
| #define TINT_FOREACH_6(CB, _1, _2, _3, _4, _5, _6) \ |
| TINT_FOREACH_5(CB, _1, _2, _3, _4, _5) \ |
| CB(_6) |
| #define TINT_FOREACH_7(CB, _1, _2, _3, _4, _5, _6, _7) \ |
| TINT_FOREACH_6(CB, _1, _2, _3, _4, _5, _6) \ |
| CB(_7) |
| #define TINT_FOREACH_8(CB, _1, _2, _3, _4, _5, _6, _7, _8) \ |
| TINT_FOREACH_7(CB, _1, _2, _3, _4, _5, _6, _7) \ |
| CB(_8) |
| #define TINT_FOREACH_9(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9) \ |
| TINT_FOREACH_8(CB, _1, _2, _3, _4, _5, _6, _7, _8) \ |
| CB(_9) |
| #define TINT_FOREACH_10(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \ |
| TINT_FOREACH_9(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9) \ |
| CB(_10) |
| #define TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \ |
| TINT_FOREACH_10(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \ |
| CB(_11) |
| #define TINT_FOREACH_12(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \ |
| TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \ |
| CB(_12) |
| #define TINT_FOREACH_13(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \ |
| TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \ |
| CB(_13) |
| #define TINT_FOREACH_14(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \ |
| TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \ |
| CB(_14) |
| #define TINT_FOREACH_15(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \ |
| TINT_FOREACH_11(CB, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \ |
| CB(_15) |
| |
| #endif // SRC_TINT_UTILS_MACROS_FOREACH_H_ |
