adamdebreceni commented on a change in pull request #917: URL: https://github.com/apache/nifi-minifi-cpp/pull/917#discussion_r503699011
########## File path: libminifi/include/utils/Enum.h ########## @@ -0,0 +1,190 @@ +/** + * 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 + +#include <string> +#include <cstring> +#include <set> + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace utils { + +#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() fn(_2) delim() fn(_3) +#define FOR_EACH_4(fn, delim, _1, _2, _3, _4) \ + fn(_1) delim() fn(_2) delim() fn(_3) delim() fn(_4) +#define FOR_EACH_5(fn, delim, _1, _2, _3, _4, _5) \ + fn(_1) delim() fn(_2) delim() fn(_3) delim() fn(_4) delim() fn(_5) +#define FOR_EACH_6(fn, delim, _1, _2, _3, _4, _5, _6) \ + fn(_1) delim() fn(_2) delim() fn(_3) delim() fn(_4) delim() \ + fn(_5) delim() fn(_6) +#define FOR_EACH_7(fn, delim, _1, _2, _3, _4, _5, _6, _7) \ + fn(_1) delim() fn(_2) delim() fn(_3) delim() fn(_4) delim() \ + fn(_5) delim() fn(_6) delim() fn(_7) +#define FOR_EACH_8(fn, delim, _1, _2, _3, _4, _5, _6, _7, _8) \ Review comment: we could give something like this a try: `#define FOR_EACH_8(fn, delim, _1, ...) fn(_1) delim() FOR_EACH_7(fn, delim, __VA_ARGS__)` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
