Support dynamic switching between integrated and discrete GPUs on Mac OS X.

base/mac/scoped_cftyperef.h

Index: base/mac/scoped_cftyperef.h
===================================================================
--- base/mac/scoped_cftyperef.h	(revision 105357)
+++ base/mac/scoped_cftyperef.h	(working copy)
@@ -14,6 +14,15 @@
 namespace base {
 namespace mac {
 
+// This class wraps the CoreFoundation routine CFRelease() in a class
+// that can be passed as a template argument to ScopedCFTypeRef below.
+class ScopedCFTypeRefRelease {
+ public:
+  inline void operator()(CFTypeRef x) const {
+    CFRelease(x);
+  }
+};
+
 // ScopedCFTypeRef<> is patterned after scoped_ptr<>, but maintains ownership
 // of a CoreFoundation object: any object that can be represented as a
 // CFTypeRef.  Style deviations here are solely for compatibility with
@@ -24,7 +33,12 @@
 // caller must own the object it gives to ScopedCFTypeRef<>, and relinquishes
 // an ownership claim to that object.  ScopedCFTypeRef<> does not call
 // CFRetain().
-template<typename CFT>
+//
+// The second template argument can be used to specify a functor used
+// to free the object. This allows this class to manage the lifetime
+// of objects similar to Core Foundation types, where the pointer-ness
+// is embedded in the type name) but with specialized releasing routines.

[Mark Mentovai, 2011/10/13 20:20:48]

The ) doesn’t close any (.

+template<typename CFT, class FreeProc = ScopedCFTypeRefRelease>
 class ScopedCFTypeRef {
  public:
   typedef CFT element_type;
@@ -34,13 +48,17 @@
   }
 
   ~ScopedCFTypeRef() {
-    if (object_)
-      CFRelease(object_);
+    if (object_) {
+      FreeProc free_proc;
+      free_proc(object_);
+    }
   }
 
   void reset(CFT object = NULL) {
-    if (object_)
-      CFRelease(object_);
+    if (object_) {
+      FreeProc free_proc;
+      free_proc(object_);
+    }
     object_ = object;
   }