/*

 * Copyright (C) 2004 Apple Computer, Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

// nil-checked CFRetain/CFRelease covers for Objective-C ids

// Use CFRetain, CFRelease, HardRetain, or HardRelease instead of

// -[NSObject retain] and -[NSObject release] if you want to store

// a pointer to an Objective-C object into memory that won't

// be scanned for GC, like a C++ object.

static inline id HardRetain(id obj)

{

    if (obj) CFRetain(obj);

    return obj;

}

static inline void HardRelease(id obj)

{

    if (obj) CFRelease(obj);

}

// As if CF and Foundation had logically separate reference counts,

// this function first increments the CF retain count, and then

// decrements the NS retain count. This is needed to handle cases where

// -retain/-release aren't equivalent to CFRetain/HardRelease, such as

// when GC is used.

// Use HardRetainWithNSRelease after allocating and initializing a NSObject

// if you want to store a pointer to that object into memory that won't

// be scanned for GC, like a C++ object.

static inline id HardRetainWithNSRelease(id obj)

{

    HardRetain(obj);

    [obj release];

    return obj;

}

// Use HardAutorelease to return an object made by a CoreFoundation

// "create" or "copy" function as an autoreleased and garbage collected

// object. CF objects need to be "made collectable" for autorelease to work

// properly under GC.

static inline id HardAutorelease(CFTypeRef obj)

{

    if (obj)

        CFMakeCollectable(obj);

    [(id)obj autorelease];

    return (id)obj;

}