mirror of
https://github.com/gnustep/libs-base.git
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Added NSNull to provide standard placeholder object for marking a nul in
a collection etc. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@7879 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Richard Frith-MacDonald
parent
b266bb9c8c
commit
81613caec7
14 changed files with 236 additions and 4 deletions
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@ -1,3 +1,11 @@
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2000-10-21 Richard Frith-Macdonald <rfm@gnu.org>
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* Headers/Foundation/NSNull.h: New placeholder class.
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* Source/NSNull.m: New placeholder class.
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* Source/GNUmakefile: Build NSNull and install header.
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* Documentation/gsdoc/GNUmakefile: Build NSNull documentation
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* Documentation/gsdoc/NSNull.gsdoc: NSNull documentation
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2000-10-20 Richard Frith-Macdonald <rfm@gnu.org>
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* Source/NSString.m: ([-initWithCharacters:length:]) use
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@ -126,6 +126,7 @@
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<item><uref url="NSNotification.html">NSNotification</uref></item>
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<item><uref url="NSNotificationCenter.html">NSNotificationCenter</uref></item>
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<item><uref url="NSNotificationQueue.html">NSNotificationQueue</uref></item>
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<item><uref url="NSNull.html">NSNull</uref></item>
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<item><uref url="NSNumber.html">NSNumber</uref></item>
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<item><uref url="NSNumberFormatter.html">NSNumberFormatter</uref></item>
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<item><uref url="NSObject.html">NSObject</uref></item>
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@ -122,6 +122,7 @@
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<li><a href ="NSNotification.html">NSNotification</a>
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<li><a href ="NSNotificationCenter.html">NSNotificationCenter</a>
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<li><a href ="NSNotificationQueue.html">NSNotificationQueue</a>
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<li><a href ="NSNull.html">NSNull</a>
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<li><a href ="NSNumber.html">NSNumber</a>
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<li><a href ="NSNumberFormatter.html">NSNumberFormatter</a>
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<li><a href ="NSObject.html">NSObject</a>
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@ -73,6 +73,7 @@ Base_GSDOC_FILES = Base.gsdoc \
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NSNotification.gsdoc \
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NSNotificationCenter.gsdoc \
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NSNotificationQueue.gsdoc \
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NSNull.gsdoc \
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NSNumber.gsdoc \
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NSNumberFormatter.gsdoc \
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NSObject.gsdoc \
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@ -1,6 +1,6 @@
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<?xml version="1.0"?>
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<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 0.6.6//EN" "http://www.gnustep.org/gsdoc-0_6_6.xml">
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<gsdoc base="NSNotificationQueue" prev="NSNotificationCenter" next="NSNumber" up="Base">
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<gsdoc base="NSNotificationQueue" prev="NSNotificationCenter" next="NSNull" up="Base">
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<head>
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<title>NSNotificationQueue</title>
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<author name="Richard Frith-Macdonald">
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@ -4,7 +4,7 @@
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<body>
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<a href ="NSNotificationCenter.html">[Previous]</a>
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<a href ="Base.html">[Up]</a>
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<a href ="NSNumber.html">[Next]</a>
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<a href ="NSNull.html">[Next]</a>
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<h1>NSNotificationQueue</h1>
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<h3>Authors </h3>
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<dl>
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33
Documentation/gsdoc/NSNull.gsdoc
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33
Documentation/gsdoc/NSNull.gsdoc
Normal file
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@ -0,0 +1,33 @@
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<?xml version="1.0"?>
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<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 0.6.6//EN" "http://www.gnustep.org/gsdoc-0_6_6.xml">
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<gsdoc base="NSNull" prev="NSNotificationQueue" next="NSNumber" up="Base">
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<head>
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<title>NSNull</title>
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<author name="Richard Frith-Macdonald">
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<email address="rfm@gnu.org"/>
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<url url="http://www.gnustep.org/developers/whoiswho.html"/>
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</author>
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<version>0.1</version>
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<date>21 October, 2000</date>
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</head>
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<body>
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<chapter>
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<heading>NSNull</heading>
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<class name="NSNull" super="NSObject">
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<declared>Foundation/NSNull.h</declared>
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<conform>NSObject</conform>
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<conform>NSCoding</conform>
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<conform>NSCopying</conform>
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<desc>
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</desc>
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<method type="NSNull*" factory="yes">
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<sel>null</sel>
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<desc>
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Return an object that can be used as a placeholder in a collection.
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This method always returns the same object.
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</desc>
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</method>
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</class>
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</chapter>
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</body>
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</gsdoc>
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44
Documentation/gsdoc/NSNull.html
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44
Documentation/gsdoc/NSNull.html
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@ -0,0 +1,44 @@
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<html><head>
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<title>NSNull</title>
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</head>
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<body>
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<a href ="NSNotificationQueue.html">[Previous]</a>
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<a href ="Base.html">[Up]</a>
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<a href ="NSNumber.html">[Next]</a>
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<h1>NSNull</h1>
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<h3>Authors </h3>
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<dl>
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<dt><a href ="http://www.gnustep.org/developers/whoiswho.html">Richard Frith-Macdonald</a>
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<dd>
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</dl>
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<p>Version: 0.1</p>
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<p>Date: 21 October, 2000</p>
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<h2><a name ="cont-0">NSNull</a></h2>
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<h2><a name ="NSNull">NSNull</a></h2>
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<p><b>Declared in: </b> Foundation/NSNull.h</p>
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<p><b>Inherits from: </b> NSObject</p>
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<p><b>Conforms to: </b> NSObject
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, NSCoding
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, NSCopying
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</p>
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<hr>
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<h2>Instance Variables </h2>
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<ul>
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</ul>
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<h2>Methods </h2>
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<ul>
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<li><a href ="NSNull.html#method-0">+null</a>
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</ul>
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<hr><h2>Class Methods </h2>
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<h3><a name ="method-0">null</a></h3>
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+ (NSNull*) <b>null</b>;<br>
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Return an object that can be used as a placeholder in a collection.
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This method always returns the same object.
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<hr>
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</body>
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</html>
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@ -1,6 +1,6 @@
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<?xml version="1.0"?>
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<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 0.6.6//EN" "http://www.gnustep.org/gsdoc-0_6_6.xml">
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<gsdoc base="NSNumber" prev="NSNotificationQueue" next="NSNumberFormatter" up="Base">
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<gsdoc base="NSNumber" prev="NSNull" next="NSNumberFormatter" up="Base">
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<head>
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<title>NSNumber</title>
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<author name="Richard Frith-Macdonald">
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@ -2,7 +2,7 @@
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<title>NSNumber</title>
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</head>
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<body>
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<a href ="NSNotificationQueue.html">[Previous]</a>
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<a href ="NSNull.html">[Previous]</a>
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<a href ="Base.html">[Up]</a>
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<a href ="NSNumberFormatter.html">[Next]</a>
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<h1>NSNumber</h1>
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@ -62,6 +62,7 @@
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#include <Foundation/NSMethodSignature.h>
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#include <Foundation/NSNotification.h>
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#include <Foundation/NSNotificationQueue.h>
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#include <Foundation/NSNull.h>
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#include <Foundation/NSPathUtilities.h>
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#include <Foundation/NSPortCoder.h>
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#include <Foundation/NSPortMessage.h>
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39
Headers/gnustep/base/NSNull.h
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39
Headers/gnustep/base/NSNull.h
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@ -0,0 +1,39 @@
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/* Interface for NSNull for GNUStep
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Copyright (C) 2000 Free Software Foundation, Inc.
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Written by: Richard Frith-Macdonald <rfm@gnu.org>
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Date: 2000
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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*/
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#ifndef __NSNull_h_GNUSTEP_BASE_INCLUDE
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#define __NSNull_h_GNUSTEP_BASE_INCLUDE
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/*
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* An object to use as a placeholder - in collections for instance.
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*/
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#ifndef NO_MACOS_X
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#include <Foundation/NSObject.h>
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@interface NSNull : NSObject <NSCoding, NSCopying>
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+ (NSNull*) null;
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@end
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#endif
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#endif /* __NSNull_h_GNUSTEP_BASE_INCLUDE */
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@ -190,6 +190,7 @@ NSMethodSignature.m \
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NSNotification.m \
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NSNotificationCenter.m \
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NSNotificationQueue.m \
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NSNull.m \
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NSNumber.m \
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NSNumberFormatter.m \
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NSObjCRuntime.m \
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@ -291,6 +292,7 @@ NSMapTable.h \
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NSMethodSignature.h \
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NSNotification.h \
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NSNotificationQueue.h \
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NSNull.h \
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NSNumberFormatter.h \
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NSObjCRuntime.h \
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NSObject.h \
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102
Source/NSNull.m
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102
Source/NSNull.m
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/* Implementation for NSNull for GNUStep
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Copyright (C) 2000 Free Software Foundation, Inc.
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Written by: Richard Frith-Macdonald <rfm@gnu.org>
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Date: 2000
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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*/
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/*
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* An object to use as a placeholder - in collections for instance.
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*/
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#include <Foundation/NSNull.h>
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@implementation NSNull
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static NSNull *null = 0;
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+ (id) allocWithZone: (NSZone*)z
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{
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return null;
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}
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+ (id) alloc
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{
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return null;
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}
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+ (void) initialize
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{
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if (null == 0)
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{
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null = NSAllocateObject(self, 0, NSDefaultMallocZone());
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}
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}
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+ (NSNull*) null
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{
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return null;
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}
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- (id) autorelease
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{
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return self;
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}
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- (id) copyWithZone: (NSZone*)z
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{
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return self;
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}
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- (id) copy
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{
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return self;
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}
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- (void) dealloc
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{
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}
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- (void) encodeWithCoder: (NSCoder*)aCoder
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{
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}
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- (id) initWithCoder: (NSCoder*)aCoder
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{
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return self;
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}
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- (BOOL) isEqual: (id)other
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{
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if (other == self)
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return YES
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else
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return NO;
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}
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- (void) release
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{
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}
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- (id) retain
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{
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return self;
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}
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@end
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