[not for commit]

Source/heap/Visitor.h

Index: Source/heap/Visitor.h
diff --git a/Source/heap/Visitor.h b/Source/heap/Visitor.h
index 80623bf29531b79daa213ccdecb17877dff4bd6d..aa44fda6245165eb48a571e5d62e4cd06ace11e0 100644
--- a/Source/heap/Visitor.h
+++ b/Source/heap/Visitor.h
@@ -52,6 +52,7 @@
 namespace WebCore {
 
 class FinalizedHeapObjectHeader;
+template<typename T> class GarbageCollected;
 template<typename T> class GarbageCollectedFinalized;
 class HeapObjectHeader;
 template<typename T> class Member;
@@ -92,6 +93,20 @@ struct GCInfo {
 };
 
 // Template struct to detect whether type T inherits from
+// GarbageCollected.
+template<typename T>
+struct IsGarbageCollected {

[Mads Ager (chromium), 2014/02/18 06:50:50]

Can we use WTF::IsSubclassOfTemplate here?

WTF::IsSubclassOfTemplate<T, GarbageCollected>::value

[Vyacheslav Egorov (Chromium), 2014/02/18 09:37:44]

Done.

+    typedef char TrueType;
+    struct FalseType {
+        char dummy[2];
+    };
+    template<typename U> static TrueType has(GarbageCollected<U>*);
+    static FalseType has(...);
+    static bool const value = sizeof(has(static_cast<T*>(0))) == sizeof(TrueType);
+};
+
+
+// Template struct to detect whether type T inherits from
 // GarbageCollectedFinalized.
 template<typename T>
 struct IsGarbageCollectedFinalized {

[Mads Ager (chromium), 2014/02/18 06:50:50]

I think we can get rid of this one as well and use the WTF version?