Add helpers for CGL types.

base/mac/scoped_cftyperef.h

Index: base/mac/scoped_cftyperef.h
diff --git a/base/mac/scoped_cftyperef.h b/base/mac/scoped_cftyperef.h
index c41de80d8052fa1dcb0dad978a6e696981c8e0aa..8567f85ffcdaed1adfe89e6056a6c333089610d2 100644
--- a/base/mac/scoped_cftyperef.h
+++ b/base/mac/scoped_cftyperef.h
@@ -7,9 +7,7 @@
 
 #include <CoreFoundation/CoreFoundation.h>
 
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_policy.h"
+#include "base/mac/scoped_typeref.h"
 
 namespace base {
 
@@ -27,78 +25,33 @@ namespace base {
 // then ScopedCFTypeRef<> will call CFRetain() on the object, and the initial
 // ownership is not changed.
 
+namespace internal {
+
+struct ScopedCFTypeRefTraits {
+  static void Retain(CFTypeRef object) {
+    CFRetain(object);
+  }
+  static void Release(CFTypeRef object) {
+    CFRelease(object);
+  }
+};
+
+}  // namespace internal
+
 template<typename CFT>
-class ScopedCFTypeRef {
+class ScopedCFTypeRef
+    : public ScopedTypeRef<CFT, internal::ScopedCFTypeRefTraits> {
  public:
   typedef CFT element_type;
 
   explicit ScopedCFTypeRef(
       CFT object = NULL,
       base::scoped_policy::OwnershipPolicy policy = base::scoped_policy::ASSUME)
-      : object_(object) {
-    if (object_ && policy == base::scoped_policy::RETAIN)
-      CFRetain(object_);
-  }
+      : ScopedTypeRef<CFT,
+                      internal::ScopedCFTypeRefTraits>(object, policy) {}
 
   ScopedCFTypeRef(const ScopedCFTypeRef<CFT>& that)
-      : object_(that.object_) {
-    if (object_)
-      CFRetain(object_);
-  }
-
-  ~ScopedCFTypeRef() {
-    if (object_)
-      CFRelease(object_);
-  }
-
-  ScopedCFTypeRef& operator=(const ScopedCFTypeRef<CFT>& that) {
-    reset(that.get(), base::scoped_policy::RETAIN);
-    return *this;
-  }
-
-  void reset(CFT object = NULL,
-             base::scoped_policy::OwnershipPolicy policy =
-                base::scoped_policy::ASSUME) {
-    if (object && policy == base::scoped_policy::RETAIN)
-      CFRetain(object);
-    if (object_)
-      CFRelease(object_);
-    object_ = object;
-  }
-
-  bool operator==(CFT that) const {
-    return object_ == that;
-  }
-
-  bool operator!=(CFT that) const {
-    return object_ != that;
-  }
-
-  operator CFT() const {
-    return object_;
-  }
-
-  CFT get() const {
-    return object_;
-  }
-
-  void swap(ScopedCFTypeRef& that) {
-    CFT temp = that.object_;
-    that.object_ = object_;
-    object_ = temp;
-  }
-
-  // ScopedCFTypeRef<>::release() is like scoped_ptr<>::release.  It is NOT
-  // a wrapper for CFRelease().  To force a ScopedCFTypeRef<> object to call
-  // CFRelease(), use ScopedCFTypeRef<>::reset().
-  CFT release() WARN_UNUSED_RESULT {
-    CFT temp = object_;
-    object_ = NULL;
-    return temp;
-  }
-
- private:
-  CFT object_;
+      : ScopedTypeRef<CFT, internal::ScopedCFTypeRefTraits>(that) {}
 };
 
 }  // namespace base