1 files changed, 72 insertions, 0 deletions
diff --git a/src/common/mac/GTMGarbageCollection.h b/src/common/mac/GTMGarbageCollection.h
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+++ b/src/common/mac/GTMGarbageCollection.h
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+//
+//  GTMGarbageCollection.h
+//
+//  Copyright 2007-2008 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+// 
+//  http://www.apache.org/licenses/LICENSE-2.0
+// 
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import <Foundation/Foundation.h>
+
+#import "GTMDefines.h"
+
+// This allows us to easily move our code from GC to non GC.
+// They are no-ops unless we are require Leopard or above.
+// See 
+// http://developer.apple.com/documentation/Cocoa/Conceptual/GarbageCollection/index.html
+// and
+// http://developer.apple.com/documentation/Cocoa/Conceptual/GarbageCollection/Articles/gcCoreFoundation.html#//apple_ref/doc/uid/TP40006687-SW1
+// for details.
+
+#if (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5) && !GTM_IPHONE_SDK
+// General use would be to call this through GTMCFAutorelease
+// but there may be a reason the you want to make something collectable
+// but not autoreleased, especially in pure GC code where you don't
+// want to bother with the nop autorelease. Done as a define instead of an 
+// inline so that tools like Clang's scan-build don't report code as leaking.
+#define GTMNSMakeCollectable(cf) ((id)NSMakeCollectable(cf))
+
+// GTMNSMakeUncollectable is for global maps, etc. that we don't
+// want released ever. You should still retain these in non-gc code.
+GTM_INLINE void GTMNSMakeUncollectable(id object) {
+  [[NSGarbageCollector defaultCollector] disableCollectorForPointer:object];
+}
+
+// Hopefully no code really needs this, but GTMIsGarbageCollectionEnabled is
+// a common way to check at runtime if GC is on.
+// There are some places where GC doesn't work w/ things w/in Apple's
+// frameworks, so this is here so GTM unittests and detect it, and not run
+// individual tests to work around bugs in Apple's frameworks.
+GTM_INLINE BOOL GTMIsGarbageCollectionEnabled(void) {
+  return ([NSGarbageCollector defaultCollector] != nil);
+}
+
+#else
+
+#define GTMNSMakeCollectable(cf) ((id)(cf))
+
+GTM_INLINE void GTMNSMakeUncollectable(id object) {
+}
+
+GTM_INLINE BOOL GTMIsGarbageCollectionEnabled(void) {
+  return NO;
+}
+
+#endif
+
+// GTMCFAutorelease makes a CF object collectable in GC mode, or adds it 
+// to the autorelease pool in non-GC mode. Either way it is taken care
+// of. Done as a define instead of an inline so that tools like Clang's
+// scan-build don't report code as leaking.
+#define GTMCFAutorelease(cf) ([GTMNSMakeCollectable(cf) autorelease])
+