include/apr_optional.h

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/* 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"
#ifdef __cplusplus
extern "C" {
#endif

#define APR_OPTIONAL_FN_TYPE(name) apr_OFN_##name##_t

#define APR_DECLARE_OPTIONAL_FN(ret,name,args) \
typedef ret (APR_OPTIONAL_FN_TYPE(name)) args

typedef void (apr_opt_fn_t)(void);
APU_DECLARE_NONSTD(void) apr_dynamic_fn_register(const char *szName, 
                                                  apr_opt_fn_t *pfn);

#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)

APU_DECLARE(apr_opt_fn_t *) apr_dynamic_fn_retrieve(const char *szName);

#define APR_RETRIEVE_OPTIONAL_FN(name) \
        (APR_OPTIONAL_FN_TYPE(name) *)apr_dynamic_fn_retrieve(#name)

#ifdef __cplusplus
}
#endif

#endif /* APR_OPTIONAL_H */