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apr_optional.h

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00001 /* Copyright 2001-2004 The Apache Software Foundation
00002  *
00003  * Licensed under the Apache License, Version 2.0 (the "License");
00004  * you may not use this file except in compliance with the License.
00005  * You may obtain a copy of the License at
00006  *
00007  *     http://www.apache.org/licenses/LICENSE-2.0
00008  *
00009  * Unless required by applicable law or agreed to in writing, software
00010  * distributed under the License is distributed on an "AS IS" BASIS,
00011  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00012  * See the License for the specific language governing permissions and
00013  * limitations under the License.
00014  */
00015 
00016 #ifndef APR_OPTIONAL_H
00017 #define APR_OPTIONAL_H
00018 
00019 #include "apu.h"
00024 #ifdef __cplusplus
00025 extern "C" {
00026 #endif
00027 
00041 #define APR_OPTIONAL_FN_TYPE(name) apr_OFN_##name##_t
00042 
00049 #define APR_DECLARE_OPTIONAL_FN(ret,name,args) \
00050 typedef ret (APR_OPTIONAL_FN_TYPE(name)) args
00051 
00058 typedef void (apr_opt_fn_t)(void);
00060 APU_DECLARE_NONSTD(void) apr_dynamic_fn_register(const char *szName, 
00061                                                   apr_opt_fn_t *pfn);
00062 
00069 #define APR_REGISTER_OPTIONAL_FN(name) do { \
00070   APR_OPTIONAL_FN_TYPE(name) *apu__opt = name; \
00071   apr_dynamic_fn_register(#name,(apr_opt_fn_t *)apu__opt); \
00072 } while (0)
00073 
00077 APU_DECLARE(apr_opt_fn_t *) apr_dynamic_fn_retrieve(const char *szName);
00078 
00083 #define APR_RETRIEVE_OPTIONAL_FN(name) \
00084         (APR_OPTIONAL_FN_TYPE(name) *)apr_dynamic_fn_retrieve(#name)
00085 
00087 #ifdef __cplusplus
00088 }
00089 #endif
00090 
00091 #endif /* APR_OPTIONAL_H */

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