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 * reserved.
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#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);
    
APU_DECLARE_NONSTD(void) apr_register_optional_fn(const char *szName, 
                                                  apr_opt_fn_t *pfn);

#define APR_REGISTER_OPTIONAL_FN(name) \
    (((void (*)(const char *, APR_OPTIONAL_FN_TYPE(name) *)) \
               &apr_dynamic_fn_register)(#name,name))

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

APU_DECLARE(apr_opt_fn_t *) apr_retrieve_optional_fn(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 */

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