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- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2001-2003 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- #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);
-
- /** @internal deprecated function, see apr_dynamic_fn_register */
- APU_DECLARE_NONSTD(void) apr_register_optional_fn(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) \
- (((void (*)(const char *, APR_OPTIONAL_FN_TYPE(name) *)) \
- &apr_dynamic_fn_register)(#name,name))
-
- /** @internal
- * Private function! DO NOT USE!
- */
- APU_DECLARE(apr_opt_fn_t *) apr_dynamic_fn_retrieve(const char *szName);
-
- /** @internal deprecated function, see apr_dynamic_fn_retrieve */
- APU_DECLARE(apr_opt_fn_t *) apr_retrieve_optional_fn(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 */
-