| #ifndef STATIC_ASSERT_H |
| #define STATIC_ASSERT_H |
| |
| /* |
| * 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. |
| */ |
| |
| /** @file |
| * STATIC_ASSERT allows you to do compile time assertions at file scope or in a function. |
| * @param expr: a boolean expression that is valid at compile time. |
| * @param msg: a "message" that must also be a valid identifier, i.e. message_with_underscores |
| */ |
| |
| |
| #ifdef __GNUC__ |
| #define STATIC_ASSERT_HELPER(expr, msg) \ |
| (!!sizeof(struct { unsigned int STATIC_ASSERTION__##msg: (expr) ? 1 : -1; })) |
| #define STATIC_ASSERT(expr, msg) \ |
| extern int (*assert_function__(void)) [STATIC_ASSERT_HELPER(expr, msg)] |
| #else |
| #define STATIC_ASSERT(expr, msg) \ |
| extern char STATIC_ASSERTION__##msg[1]; \ |
| extern char STATIC_ASSERTION__##msg[(expr)?1:2] |
| #endif /* #ifdef __GNUC__ */ |
| |
| #define STATIC_ASSERT_ARRAY_LEN(array, len) \ |
| STATIC_ASSERT(sizeof(array)/sizeof(array[0]) == len, array##_wrong_size); |
| |
| #endif // STATIC_ASSERT_H |