Change Has* and Get*Attributes to return Maybe<*>, indicating possible exceptions.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 877 matching lines @@
 struct Maybe {
   Maybe() : has_value(false) {}
   explicit Maybe(T t) : has_value(true), value(t) {}
   Maybe(bool has, T t) : has_value(has), value(t) {}
 
   bool has_value;
   T value;
 };
 
 
+// Convenience wrapper.
+template <class T>
+inline Maybe<T> maybe(T t) {
+  return Maybe<T>(t);
+}
+
+
 // --- Special objects ---
 
 
 /**
  * The superclass of values and API object templates.
  */
 class V8_EXPORT Data {
  private:
   Data();
 };
@@ skipping 5854 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_