| #ifndef EXTRA_H |
| #define EXTRA_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. |
| */ |
| |
| #include <proton/type_compat.h> |
| #include <proton/types.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| |
| /** |
| * @cond INTERNAL |
| * Support for allocating extra aligned memory after a type. |
| */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * extra_t contains a size and is maximally aligned so the memory immediately |
| * after it can store any type of value. |
| */ |
| typedef union pn_extra_t { |
| size_t size; |
| #if __STDC_VERSION__ >= 201112 |
| max_align_t max; |
| #else |
| /* Not standard but fairly safe */ |
| uint64_t i; |
| long double d; |
| void *v; |
| void (*fp)(void); |
| #endif |
| } pn_extra_t; |
| |
| static inline pn_rwbytes_t pn_extra_rwbytes(pn_extra_t *x) { |
| return pn_rwbytes(x->size, (char*)(x+1)); |
| } |
| |
| /* Declare private helper struct for T */ |
| #define PN_EXTRA_DECLARE(T) typedef struct T##__extra { T base; pn_extra_t extra; } T##__extra |
| #define PN_EXTRA_SIZEOF(T, N) (sizeof(T##__extra)+(N)) |
| #define PN_EXTRA_GET(T, P) pn_extra_rwbytes(&((T##__extra*)(P))->extra) |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| /** @endcond */ |
| |
| #endif // EXTRA_H |