/** GNUStep callback functions.  Implicitly required by the standard.
   Copyright(C) 1996  Free Software Foundation, Inc.

   Author: Albin L. Jones <Albin.L.Jones@Dartmouth.EDU>
   Created: Tue Feb 13 23:10:29 EST 1996
   Updated: Wed Mar 20 19:53:48 EST 1996
   Updated: Mon Feb  7 10:25:00 GMT 2000
   Serial: 96.03.20.02

   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or(at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.

   <title>NSCallBacks class reference</title>
   $Date$ $Revision$
*/

/**** Included Headers *******************************************************/

#include "config.h"
#include "GNUstepBase/preface.h"
#include "NSCallBacks.h"
#include "Foundation/NSObject.h"
#include "Foundation/NSString.h"

/**** Type, Constant, and Macro Definitions **********************************/

/**** Function Implementations ***********************************************/

/** For `int's **/

unsigned int
_NS_int_hash(void *table, void* i)
{
  return (unsigned)(uintptr_t)i;
}

BOOL
_NS_int_is_equal(void *table, void* i, void* j)
{
  return (i == j) ? YES : NO;
}

void
_NS_int_retain(void *table, void* i)
{
  return;
}

void
_NS_int_release(void *table, void* i)
{
  return;
}

NSString *
_NS_int_describe(void *table, void* i)
{
  return [NSString stringWithFormat: @"%d", (int)(intptr_t)i];
}

/** For owned `void *' **/

unsigned int
_NS_owned_void_p_hash(void *table, void *p)
{
  /* P may be aligned, so we need to compensate. */
  return ((unsigned)(uintptr_t)p)/4;
}

BOOL
_NS_owned_void_p_is_equal(void *table, void *p, void *q)
{
  return (p == q) ? YES : NO;
}

void
_NS_owned_void_p_retain(void *table, void *p)
{
  return;
}

void
_NS_owned_void_p_release(void *table, void *p)
{
  if (p != 0)
    objc_free(p);
  return;
}

NSString *
_NS_owned_void_p_describe(void *table, void *p)
{
  return [NSString stringWithFormat: @"%#x", p];
}

/** For non-retained Objective-C objects **/

unsigned int
_NS_non_retained_id_hash(void *table, id <NSObject> o)
{
  return [o hash];
}

BOOL
_NS_non_retained_id_is_equal(void *table, id <NSObject> o, id <NSObject> p)
{
  return [o isEqual: p];
}

void
_NS_non_retained_id_retain(void *table, id <NSObject> o)
{
  return;
}

void
_NS_non_retained_id_release(void *table, id <NSObject> o)
{
  return;
}

NSString *
_NS_non_retained_id_describe(void *table, id <NSObject> o)
{
  return [o description];
}

/** For(retainable) objects **/

unsigned int
_NS_id_hash(void *table, id <NSObject> o)
{
  return [o hash];
}

BOOL
_NS_id_is_equal(void *table, id <NSObject> o, id <NSObject> p)
{
  return [o isEqual: p];
}

void
_NS_id_retain(void *table, id <NSObject> o)
{
  IF_NO_GC(RETAIN(o));
  return;
}

void
_NS_id_release(void *table, id <NSObject> o)
{
  RELEASE(o);
  return;
}

NSString *
_NS_id_describe(void *table, id <NSObject> o)
{
  return [o description];
}


/** For(non-owned) `void *' **/

unsigned int
_NS_non_owned_void_p_hash(void *table, void *p)
{
  return ((unsigned)(uintptr_t)p)/4;
}

BOOL
_NS_non_owned_void_p_is_equal(void *table, void *p, void *q)
{
  return (p == q) ? YES : NO;
}

void
_NS_non_owned_void_p_retain(void *table, void *p)
{
  return;
}

void
_NS_non_owned_void_p_release(void *table, void *p)
{
  return;
}

NSString *
_NS_non_owned_void_p_describe(void *table, void *p)
{
  return [NSString stringWithFormat: @"%0x", p];
}

/** For pointers to structures and `int *' **/

unsigned int
_NS_int_p_hash(void *table, int *p)
{
  return ((unsigned)(uintptr_t)p)/4;
}

BOOL
_NS_int_p_is_equal(void *table, int *p, int *q)
{
  return (p == q) ? YES : NO;
}

void
_NS_int_p_retain(void *table, int *p)
{
  return;
}

void
_NS_int_p_release(void *table, int *p)
{
  return;
}

NSString *
_NS_int_p_describe(void *table, int *p)
{
  /* Is this useful? */
  return [NSString stringWithFormat: @"%d(%#x)", *p, p];
}