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/* classes: h_files */
#ifndef SCM_HOOKS_H
#define SCM_HOOKS_H
/* Copyright (C) 1995,1996,1999,2000,2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/__scm.h"
/*
* C level hooks
*/
/*
* The interface is designed for and- and or-type hooks which
* both may want to indicate success/failure and return a result.
*/
typedef enum scm_t_c_hook_type {
SCM_C_HOOK_NORMAL,
SCM_C_HOOK_OR,
SCM_C_HOOK_AND
} scm_t_c_hook_type;
typedef void *(*scm_t_c_hook_function) (void *hook_data,
void *func_data,
void *data);
typedef struct scm_t_c_hook_entry {
struct scm_t_c_hook_entry *next;
scm_t_c_hook_function func;
void *data;
} scm_t_c_hook_entry;
typedef struct scm_t_c_hook {
scm_t_c_hook_entry *first;
scm_t_c_hook_type type;
void *data;
} scm_t_c_hook;
extern void scm_c_hook_init (scm_t_c_hook *hook,
void *hook_data,
scm_t_c_hook_type type);
extern void scm_c_hook_add (scm_t_c_hook *hook,
scm_t_c_hook_function func,
void *func_data,
int appendp);
extern void scm_c_hook_remove (scm_t_c_hook *hook,
scm_t_c_hook_function func,
void *func_data);
extern void *scm_c_hook_run (scm_t_c_hook *hook, void *data);
/*
* Scheme level hooks
*/
extern scm_t_bits scm_tc16_hook;
#define SCM_HOOKP(x) SCM_TYP16_PREDICATE (scm_tc16_hook, x)
#define SCM_HOOK_ARITY(hook) (SCM_CELL_WORD_0 (hook) >> 16)
#define SCM_HOOK_PROCEDURES(hook) SCM_CELL_OBJECT_1 (hook)
#define SCM_SET_HOOK_PROCEDURES(hook, procs) SCM_SET_CELL_OBJECT_1 ((hook), (procs))
extern SCM scm_make_hook (SCM n_args);
extern SCM scm_hook_p (SCM x);
extern SCM scm_hook_empty_p (SCM hook);
extern SCM scm_add_hook_x (SCM hook, SCM thunk, SCM appendp);
extern SCM scm_remove_hook_x (SCM hook, SCM thunk);
extern SCM scm_reset_hook_x (SCM hook);
extern SCM scm_run_hook (SCM hook, SCM args);
extern void scm_c_run_hook (SCM hook, SCM args);
extern SCM scm_hook_to_list (SCM hook);
extern void scm_init_hooks (void);
#if (SCM_DEBUG_DEPRECATED == 0)
extern SCM scm_create_hook (const char* name, int n_args);
#endif
#endif /* SCM_HOOKS_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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