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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:12:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:12:13 +0000 |
commit | 2e88f64bb100419daef10f84e49d7aed2bfff0d2 (patch) | |
tree | 5fd273cc604fd00efd630eb387a6f79ce102f4e3 /include/apr_optional.h | |
parent | Initial commit. (diff) | |
download | apr-util-upstream.tar.xz apr-util-upstream.zip |
Adding upstream version 1.6.3.upstream/1.6.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/apr_optional.h')
-rw-r--r-- | include/apr_optional.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/include/apr_optional.h b/include/apr_optional.h new file mode 100644 index 0000000..3301d66 --- /dev/null +++ b/include/apr_optional.h @@ -0,0 +1,92 @@ +/* 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. + */ + +#ifndef APR_OPTIONAL_H +#define APR_OPTIONAL_H + +#include "apu.h" +/** + * @file apr_optional.h + * @brief APR-UTIL registration of functions exported by modules + */ +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @defgroup APR_Util_Opt Optional Functions + * @ingroup APR_Util + * + * Typesafe registration and retrieval of functions that may not be present + * (i.e. functions exported by optional modules) + * @{ + */ + +/** + * The type of an optional function. + * @param name The name of the function + */ +#define APR_OPTIONAL_FN_TYPE(name) apr_OFN_##name##_t + +/** + * Declare an optional function. + * @param ret The return type of the function + * @param name The name of the function + * @param args The function arguments (including brackets) + */ +#define APR_DECLARE_OPTIONAL_FN(ret,name,args) \ +typedef ret (APR_OPTIONAL_FN_TYPE(name)) args + +/** + * XXX: This doesn't belong here, then! + * Private function! DO NOT USE! + * @internal + */ + +typedef void (apr_opt_fn_t)(void); +/** @internal */ +APU_DECLARE_NONSTD(void) apr_dynamic_fn_register(const char *szName, + apr_opt_fn_t *pfn); + +/** + * Register an optional function. This can be later retrieved, type-safely, by + * name. Like all global functions, the name must be unique. Note that, + * confusingly but correctly, the function itself can be static! + * @param name The name of the function + */ +#define APR_REGISTER_OPTIONAL_FN(name) do { \ + APR_OPTIONAL_FN_TYPE(name) *apu__opt = name; \ + apr_dynamic_fn_register(#name,(apr_opt_fn_t *)apu__opt); \ +} while (0) + +/** @internal + * Private function! DO NOT USE! + */ +APU_DECLARE(apr_opt_fn_t *) apr_dynamic_fn_retrieve(const char *szName); + +/** + * Retrieve an optional function. Returns NULL if the function is not present. + * @param name The name of the function + */ +#define APR_RETRIEVE_OPTIONAL_FN(name) \ + (APR_OPTIONAL_FN_TYPE(name) *)apr_dynamic_fn_retrieve(#name) + +/** @} */ +#ifdef __cplusplus +} +#endif + +#endif /* APR_OPTIONAL_H */ |