Add WeakMap to v8.h

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 1df17bbaf5107619ca6245610c32a8e9cda9322e..9e3dc33256a1da095bd534c68d6ea61699ff6a24 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1527,6 +1527,30 @@ class V8_EXPORT JSON {
 };
 
 
+/**
+ * A map whose keys are referenced weakly. It is similar to JavaScript WeakMap
+ * but
+ * can be created without entering a v8::Context.

[Michael Starzinger, 2015/02/03 13:21:54]

nit: Can we add "... and hence shouldn't escape to JavaScript" to the comment
just to drive home the point?

[yurys, 2015/02/03 13:39:06]

Absolutely. Done.

+ */
+class V8_EXPORT WeakMap {
+ public:
+  static WeakMap* New(Isolate* isolate);
+  void Set(Handle<Value> key, Handle<Value> value);
+  Local<Value> Get(Handle<Value> key);
+  bool Has(Handle<Value> key);
+  bool Delete(Handle<Value> key);
+
+ private:
+  WeakMap(Isolate* isolate, Handle<Object> weak_map)
+      : isolate_(isolate), map_(isolate, weak_map) {}
+  Isolate* isolate_;
+  UniquePersistent<Object> map_;
+
+  WeakMap(WeakMap&);

[Michael Starzinger, 2015/02/03 13:21:54]

nit: // Disallow copying and assigning.

[yurys, 2015/02/03 13:39:07]

Done.

+  void operator=(WeakMap&);
+};
+
+
 // --- Value ---