Bring outline view branch up to date with trunk (r3471:r3517).

1 files changed, 40 insertions, 0 deletions

diff --git a/Source/SPObjectAdditions.m b/Source/SPObjectAdditions.m
new file mode 100644
index 00000000..de762f59
--- /dev/null
+++ b/Source/SPObjectAdditions.m
@@ -0,0 +1,40 @@
+//
+//  $Id$
+//
+//  SPObjectAdditions.m
+//  sequel-pro
+//
+//  Created by Rowan Beentje (rowan.beent.je) on February 22, 2012
+//  Copyright (c) 2012 Rowan Beentje. All rights reserved.
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program 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 General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  More info at <http://code.google.com/p/sequel-pro/>
+
+@implementation NSObject (SPObjectAdditions)
+
+/**
+ * Detect whether an object is a NSNull instance
+ */
+- (BOOL)isNSNull
+{
+	id const null = [NSNull null];
+
+	// [NSNull null] is documented as being a singleton class so a pointer equality
+	// check is possible - and much faster than checking class membership.
+	return (self == null);
+}
+
+@end