| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 |
| * |
| * http://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. |
| */ |
| |
| #pragma once |
| |
| #define COMMA(...) , |
| #define MSVC_HACK(x) x |
| |
| #define PICK_(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, ...) _15 |
| #define COUNT(...) \ |
| MSVC_HACK(PICK_(__VA_ARGS__, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)) |
| |
| #define CONCAT_(a, b) a ## b |
| #define CONCAT(a, b) CONCAT_(a, b) |
| |
| #define CALL(Fn, ...) MSVC_HACK(Fn(__VA_ARGS__)) |
| #define SPREAD(...) __VA_ARGS__ |
| |
| #define FOR_EACH(fn, delim, ARGS) \ |
| CALL(CONCAT(FOR_EACH_, COUNT ARGS), fn, delim, SPREAD ARGS) |
| |
| #define FOR_EACH_0(...) |
| #define FOR_EACH_1(fn, delim, _1) \ |
| fn(_1) |
| #define FOR_EACH_2(fn, delim, _1, _2) \ |
| fn(_1) delim() fn(_2) |
| #define FOR_EACH_3(fn, delim, _1, _2, _3) \ |
| fn(_1) delim() FOR_EACH_2(fn, delim, _2, _3) |
| #define FOR_EACH_4(fn, delim, _1, _2, _3, _4) \ |
| fn(_1) delim() FOR_EACH_3(fn, delim, _2, _3, _4) |
| #define FOR_EACH_5(fn, delim, _1, _2, _3, _4, _5) \ |
| fn(_1) delim() FOR_EACH_4(fn, delim, _2, _3, _4, _5) |
| #define FOR_EACH_6(fn, delim, _1, _2, _3, _4, _5, _6) \ |
| fn(_1) delim() FOR_EACH_5(fn, delim, _2, _3, _4, _5, _6) |
| #define FOR_EACH_7(fn, delim, _1, _2, _3, _4, _5, _6, _7) \ |
| fn(_1) delim() FOR_EACH_6(fn, delim, _2, _3, _4, _5, _6, _7) |
| #define FOR_EACH_8(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8) \ |
| fn(_1) delim() FOR_EACH_7(fn, delim, _2, _3, _4, _5, _6, _7, _8) |
| #define FOR_EACH_9(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8, _9) \ |
| fn(_1) delim() FOR_EACH_8(fn, delim, _2, _3, _4, _5, _6, _7, _8, _9) |
| #define FOR_EACH_10(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \ |
| fn(_1) delim() FOR_EACH_9(fn, delim, _2, _3, _4, _5, _6, _7, _8, _9, _10) |
| #define FOR_EACH_11(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \ |
| fn(_1) delim() FOR_EACH_10(fn, delim, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) |
| #define FOR_EACH_12(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \ |
| fn(_1) delim() FOR_EACH_11(fn, delim, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) |
| |
| #define FIRST_(a, b) a |
| #define FIRST(x, ...) FIRST_ x |
| #define SECOND_(a, b) b |
| #define SECOND(x, ...) SECOND_ x |
| #define NOTHING() |
| #define IDENTITY(x) x |
