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/* -----------------------------------------------------------------------------
* void.c
*
* Implements a "void" object that is really just a DOH container around
* an arbitrary C object represented as a void *.
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
*
* Copyright (C) 1999-2000. The University of Chicago
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
char cvsroot_void_c[] = "$Id$";
#include "dohint.h"
typedef struct {
void *ptr;
void (*del) (void *);
} VoidObj;
/* -----------------------------------------------------------------------------
* Void_delete()
*
* Delete a void object. Invokes the destructor supplied at the time of creation.
* ----------------------------------------------------------------------------- */
static void Void_delete(DOH *vo) {
VoidObj *v = (VoidObj *) ObjData(vo);
if (v->del)
(*v->del) (v->ptr);
DohFree(v);
}
/* -----------------------------------------------------------------------------
* Void_copy()
*
* Copies a void object. This is only a shallow copy. The object destruction
* function is not copied in order to avoid potential double-free problems.
* ----------------------------------------------------------------------------- */
static DOH *Void_copy(DOH *vo) {
VoidObj *v = (VoidObj *) ObjData(vo);
return NewVoid(v->ptr, 0);
}
/* -----------------------------------------------------------------------------
* Void_data()
*
* Returns the void * stored in the object.
* ----------------------------------------------------------------------------- */
static void *Void_data(DOH *vo) {
VoidObj *v = (VoidObj *) ObjData(vo);
return v->ptr;
}
static DohObjInfo DohVoidType = {
"VoidObj", /* objname */
Void_delete, /* doh_del */
Void_copy, /* doh_copy */
0, /* doh_clear */
0, /* doh_str */
Void_data, /* doh_data */
0, /* doh_dump */
0, /* doh_len */
0, /* doh_hash */
0, /* doh_cmp */
0, /* doh_equal */
0, /* doh_first */
0, /* doh_next */
0, /* doh_setfile */
0, /* doh_getfile */
0, /* doh_setline */
0, /* doh_getline */
0, /* doh_mapping */
0, /* doh_sequence */
0, /* doh_file */
0, /* doh_string */
0, /* doh_reserved */
0, /* clientdata */
};
/* -----------------------------------------------------------------------------
* NewVoid()
*
* Creates a new Void object given a void * and an optional destructor function.
* ----------------------------------------------------------------------------- */
DOH *DohNewVoid(void *obj, void (*del) (void *)) {
VoidObj *v;
v = (VoidObj *) DohMalloc(sizeof(VoidObj));
v->ptr = obj;
v->del = del;
return DohObjMalloc(&DohVoidType, v);
}
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