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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>GCObject documentation</title>
</head>
<body>
<font face="serif">
<a href="BaseAdditions.html">Up</a>
<br />
<h1><a name="title$GCObject">GCObject documentation</a></h1>
<h3>Authors</h3>
<dl>
<dt>Richard Frith-Macdonald (<a href="mailto:rfm@gnu.org"><code>rfm@gnu.org</code></a>)</dt>
<dd>
</dd>
</dl>
<p><b>Copyright:</b> (C) 2002 Free Software Foundation, Inc.</p>
<div>
<hr width="50%" align="left" />
<h3>Contents -</h3>
<ol>
<li>
<a href="#001000000000">Software documentation for the GCArray class</a>
</li>
<li>
<a href="#002000000000">Software documentation for the GCDictionary class</a>
</li>
<li>
<a href="#003000000000">Software documentation for the GCMutableArray class</a>
</li>
<li>
<a href="#004000000000">Software documentation for the GCMutableDictionary
class</a>
</li>
<li>
<a href="#005000000000">Software documentation for the GCObject class</a>
</li>
<li>
<a href="#006000000000">Software documentation for the GCObject(Extra)
category</a>
</li>
</ol>
<hr width="50%" align="left" />
</div>
<h1><a name="001000000000">
Software documentation for the GCArray class
</a></h1>
<h2><a name="class$GCArray">GCArray</a> : NSArray</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_GCArray_ivars">Instance Variables</a>
<br/><br/>
<a name="_GCArray_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for GCArray Class</h2>
<h3><a name="ivariable$GCArray*_contents">_contents</a></h3>
@protected id* <b>_contents</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCArray*_count">_count</a></h3>
@protected unsigned int <b>_count</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCArray*_isGCObject">_isGCObject</a></h3>
@protected BOOL* <b>_isGCObject</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCArray*gc">gc</a></h3>
@protected gcInfo <b>gc</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="002000000000">
Software documentation for the GCDictionary class
</a></h1>
<h2><a name="class$GCDictionary">GCDictionary</a> : NSDictionary</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_GCDictionary_ivars">Instance Variables</a>
<br/><br/>
<a name="_GCDictionary_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for GCDictionary Class</h2>
<h3><a name="ivariable$GCDictionary*_map">_map</a></h3>
@protected NSMapTable* <b>_map</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCDictionary*gc">gc</a></h3>
@protected gcInfo <b>gc</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="003000000000">
Software documentation for the GCMutableArray class
</a></h1>
<h2><a name="class$GCMutableArray">GCMutableArray</a> : NSMutableArray</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_GCMutableArray_ivars">Instance Variables</a>
<br/><br/>
<a name="_GCMutableArray_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for GCMutableArray Class</h2>
<h3><a name="ivariable$GCMutableArray*_contents">_contents</a></h3>
@protected id* <b>_contents</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCMutableArray*_count">_count</a></h3>
@protected unsigned int <b>_count</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCMutableArray*_isGCObject">_isGCObject</a></h3>
@protected BOOL* <b>_isGCObject</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCMutableArray*_maxCount">_maxCount</a></h3>
@protected unsigned int <b>_maxCount</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCMutableArray*gc">gc</a></h3>
@protected gcInfo <b>gc</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="004000000000">
Software documentation for the GCMutableDictionary
class
</a></h1>
<h2><a name="class$GCMutableDictionary">GCMutableDictionary</a> : NSMutableDictionary</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_GCMutableDictionary_ivars">Instance Variables</a>
<br/><br/>
<a name="_GCMutableDictionary_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for GCMutableDictionary Class</h2>
<h3><a name="ivariable$GCMutableDictionary*_map">_map</a></h3>
@protected NSMapTable* <b>_map</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$GCMutableDictionary*gc">gc</a></h3>
@protected gcInfo <b>gc</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="005000000000">
Software documentation for the GCObject class
</a></h1>
<h2><a name="class$GCObject">GCObject</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
</p>
<p>
The GCObject class is both the base class for all
garbage collected objects, and an infrastructure
for handling garbage collection.
</p>
<p>
</p>
<p>
It maintains a list of all garbage collectable objects
and provides a method to run a garbage collection pass
on those objects.
</p>
<p>
</div>
<hr width="50%" align="left" />
<a href="#_GCObject_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcAlreadyVisited">-gcAlreadyVisited</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcNextObject">-gcNextObject</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcPreviousObject">-gcPreviousObject</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetNextObject$">-gcSetNextObject:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetPreviousObject$">-gcSetPreviousObject:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetVisited$">-gcSetVisited:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject+gcCollectGarbage">+gcCollectGarbage</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject+gcIsCollecting">+gcIsCollecting</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject+gcObjectWillBeDeallocated$">+gcObjectWillBeDeallocated:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject-gcDecrementRefCount">-gcDecrementRefCount</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject-gcDecrementRefCountOfContainedObjects">-gcDecrementRefCountOfContainedObjects</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject-gcIncrementRefCount">-gcIncrementRefCount</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject-gcIncrementRefCountOfContainedObjects">-gcIncrementRefCountOfContainedObjects</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$GCObject+gcCollectGarbage">gcCollectGarbage </a></h3>
+ (void) <b>gcCollectGarbage</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
</p>
<p>
This method runs a garbage collection, causing
unreferenced objects to be deallocated. This
is done using a simple three pass algorithm -
</p>
<p>
<dl>
<dt>Pass 1</dt>
<dd>
All the garbage collectable objects are sent a
<a rel="gsdoc" href="#method$GCObject-gcDecrementRefCountOfContainedObjects">-gcDecrementRefCountOfContainedObjects</a>
message.
</dd>
<dt>Pass 2</dt>
<dd>
All objects having a refCount greater than 0 are
sent an
<a rel="gsdoc" href="#method$GCObject-gcIncrementRefCountOfContainedObjects">-gcIncrementRefCountOfContainedObjects</a>
message.
</dd>
<dt>Pass 3</dt>
<dd>
All the objects that still have the refCount of 0
are part of cyclic graphs and none of the objects
from this graph are held by some object outside
graph. These objects receive the
-dealloc
message. In this method they should send the
-dealloc
message to any garbage collectable (GCObject
and subclass) instances they contain.
</dd>
</dl>
</p>
<p>
During garbage collection, the
<a rel="gsdoc" href="#method$GCObject+gcIsCollecting">
+gcIsCollecting
</a>
method returns <code>YES</code>.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject+gcIsCollecting">gcIsCollecting </a></h3>
+ (BOOL) <b>gcIsCollecting</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns a flag to indicate whether a garbage
collection is in progress.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject+gcObjectWillBeDeallocated$">gcObjectWillBeDeallocated: </a></h3>
+ (void) <b>gcObjectWillBeDeallocated:</b> (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*)anObject;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Called to remove <var>anObject</var> from the list
of garbage collectable objects. <br /> This method is
provided so that classes which are not subclasses
of GCObject (but which have the same initial instance
variable layout) can use multiple inheritance
(behaviors) to act as GCObject instances, but
can have their own
-dealloc
methods. <br /> These classes should call this in
their own
-dealloc
methods.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject-gcDecrementRefCount">gcDecrementRefCount </a></h3>
- (void) <b>gcDecrementRefCount</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Decrements the garbage collection reference
count for the receiver. <br />
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject-gcDecrementRefCountOfContainedObjects">gcDecrementRefCountOfContainedObjects </a></h3>
- (void) <b>gcDecrementRefCountOfContainedObjects</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
</p>
<p>
Marks the receiver as not having been visited in
the current garbage collection process (first pass of
collection).
</p>
<p>
</p>
<p>
All container subclasses should override this method
to call the super implementation then decrement the
ref counts of their contents as well as sending the
<a rel="gsdoc" href="#method$GCObject-gcDecrementRefCountOfContainedObjects">-gcDecrementRefCountOfContainedObjects</a>
message to each of them.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject-gcIncrementRefCount">gcIncrementRefCount </a></h3>
- (void) <b>gcIncrementRefCount</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Increments the garbage collection reference
count for the receiver. <br />
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject-gcIncrementRefCountOfContainedObjects">gcIncrementRefCountOfContainedObjects </a></h3>
- (BOOL) <b>gcIncrementRefCountOfContainedObjects</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
</p>
<p>
Checks to see if the receiver has already been
visited in the current garbage collection
process, and either marks the receiver as
visited (and returns <code>YES</code>) or returns
<code>NO</code> to indicate that it had already
been visited.
</p>
<p>
</p>
<p>
All container subclasses should override this method
to call the super implementation then, if the method
returns <code>YES</code>, increment the reference
count of any contained objects and send the
<a rel="gsdoc" href="#method$GCObject-gcIncrementRefCountOfContainedObjects">-gcIncrementRefCountOfContainedObjects</a>
to each of the contained objects too.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<a name="_GCObject_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for GCObject Class</h2>
<h3><a name="ivariable$GCObject*gc">gc</a></h3>
@protected gcInfo <b>gc</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="006000000000">
Software documentation for the GCObject(Extra)
category
</a></h1>
<h2><a rel="gsdoc" href="#class$GCObject">GCObject</a>(<a name="category$GCObject(Extra)">Extra</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>GNUstepBase/GCObject.h</dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
This category implements accessor methods for the
instance variables used for garbage collecting.
If/when we can ensure that all garbage collecting
classes use the same initial ivar layout, we can
remove these methods and the garbage collector can
access the ivars directly, making a pretty big
performance improvement during collecting. <br />
NB. These methods must *only* be used by the garbage
collecting process or in methods called from the
garbage collector. Anything else is not thread-safe.
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcAlreadyVisited">-gcAlreadyVisited</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcNextObject">-gcNextObject</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcPreviousObject">-gcPreviousObject</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetNextObject$">-gcSetNextObject:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetPreviousObject$">-gcSetPreviousObject:</a></li>
<li><a rel="gsdoc" href="GCObject.html#method$GCObject(Extra)-gcSetVisited$">-gcSetVisited:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$GCObject(Extra)-gcAlreadyVisited">gcAlreadyVisited </a></h3>
- (BOOL) <b>gcAlreadyVisited</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject(Extra)-gcNextObject">gcNextObject </a></h3>
- (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*) <b>gcNextObject</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject(Extra)-gcPreviousObject">gcPreviousObject </a></h3>
- (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*) <b>gcPreviousObject</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject(Extra)-gcSetNextObject$">gcSetNextObject: </a></h3>
- (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*) <b>gcSetNextObject:</b> (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*)anObject;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject(Extra)-gcSetPreviousObject$">gcSetPreviousObject: </a></h3>
- (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*) <b>gcSetPreviousObject:</b> (<a rel="gsdoc" href="#class$GCObject">GCObject</a>*)anObject;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$GCObject(Extra)-gcSetVisited$">gcSetVisited: </a></h3>
- (void) <b>gcSetVisited:</b> (BOOL)flag;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<br />
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