Add Persistent::ClearAndLeak.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 3a86e86e020cbc9448c50f2ccd21476035a66c2e..ba70a33d9739161e09f973afc1be657bce60f7c8 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -695,6 +695,8 @@ template <class T> class Persistent // NOLINT
    */
   V8_INLINE(void Reset(Isolate* isolate, const Handle<T>& other));
 
+  V8_INLINE(T* LeakPersistent());

[Sven Panne, 2013/05/10 12:00:02]

Please add a comment that it is necessary to re-wrap the pointer later and
Dispose it, otherwise one keeps a Node live indefinitely.

[marja, 2013/05/10 13:02:26]

Done.

+
 #ifndef V8_USE_UNSAFE_HANDLES
 
 #ifndef V8_ALLOW_ACCESS_TO_PERSISTENT_IMPLICIT
@@ -5384,6 +5386,7 @@ void Persistent<T>::SetWrapperClassId(uint16_t class_id) {
   SetWrapperClassId(Isolate::GetCurrent(), class_id);
 }
 
+
 template <class T>
 void Persistent<T>::Reset(Isolate* isolate, const Handle<T>& other) {
   Dispose(isolate);
@@ -5400,6 +5403,21 @@ void Persistent<T>::Reset(Isolate* isolate, const Handle<T>& other) {
 #endif
 }
 
+
+template <class T>
+T* Persistent<T>::LeakPersistent() {

[Sven Panne, 2013/05/10 12:00:02]

As discussed offline, we should better name it "ClearAndLeak".

[marja, 2013/05/10 13:02:26]

Done.

+  T* old;
+#ifdef V8_USE_UNSAFE_HANDLES
+  old = this->operator*();

[Sven Panne, 2013/05/10 12:00:02]

Can we use '*this' here? If not, a comment might be good...

[marja, 2013/05/10 13:02:26]

"this" is not Persistent, but Persistent*, so "*this" won't be the right thing.
But we can use "**this". It's just not very clear. (Changed to **this, however.)

+  *this = Persistent<T>();
+#else
+  old = val_;
+  val_ = NULL;
+#endif
+  return old;
+}
+
+
 template <class T>
 void Persistent<T>::SetWrapperClassId(Isolate* isolate, uint16_t class_id) {
   typedef internal::Internals I;