More switching to standard type traits

third_party/WebKit/Source/wtf/LeakAnnotations.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 83 matching lines @@
 //
 // An empty, trivial registerStatic() method is provided for all other class types T.
 template<typename T>
 class CanRegisterStaticLocalReference {
     typedef char YesType;
     typedef struct NoType {
         char padding[8];
     } NoType;
 
     // Check if class T has public method "T* registerAsStaticReference()".
-    template<typename V> static YesType checkHasRegisterAsStaticReferenceMethod(V* p, typename EnableIf<IsSubclass<V, typename std::remove_pointer<decltype(p->registerAsStaticReference())>::type>::value>::Type* = 0);
+    template<typename V> static YesType checkHasRegisterAsStaticReferenceMethod(V* p, typename std::enable_if<std::is_base_of<V, typename std::remove_pointer<decltype(p->registerAsStaticReference())>::type>::value>::Type* = 0);

[Nico, 2015/12/09 15:09:39]

Since you're replacing IsSubclass with is_base_of here, don't you need to switch
the order of the arguments?

Since you didn't do this and things appear to work: Do we have to few tests
here? (Or maybe just too few static_assert()s?)

[Mikhail, 2015/12/10 11:38:15]

I do, thanks for noticing. Fixed in the latest patch.
I failed to find testing code for it. It's probably worth adding but IMO in a
separate patch.

     template<typename V> static NoType checkHasRegisterAsStaticReferenceMethod(...);
 
 public:
     static const bool value = sizeof(YesType) + sizeof(T) == sizeof(checkHasRegisterAsStaticReferenceMethod<T>(nullptr)) + sizeof(T);
 };
 
 template<typename T, bool = CanRegisterStaticLocalReference<T>::value>
 class RegisterStaticLocalReference {
 public:
     static T* registerStatic(T* ptr)
@@ skipping 14 matching lines @@
 #define LEAK_SANITIZER_REGISTER_STATIC_LOCAL(Type, Object) WTF::RegisterStaticLocalReference<Type>::registerStatic(Object)
 #else
 #define WTF_INTERNAL_LEAK_SANITIZER_DISABLED_SCOPE
 #define LEAK_SANITIZER_IGNORE_OBJECT
 #define LEAK_SANITIZER_REGISTER_STATIC_LOCAL(Type, Object) Object
 #endif // USE(LEAK_SANITIZER)
 
 } // namespace WTF
 
 #endif // WTF_LeakAnnotations_h