Expose IsConstructor to the C++ API

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 2941 matching lines @@
   Local<Context> CreationContext();
 
   /**
    * Checks whether a callback is set by the
    * ObjectTemplate::SetCallAsFunctionHandler method.
    * When an Object is callable this method returns true.
    */
   bool IsCallable();
 
   /**
+   * True if this object is a constructor.
+   */
+  bool IsConstructor();
+
+  /**
    * Call an Object as a function if a callback is set by the
    * ObjectTemplate::SetCallAsFunctionHandler method.
    */
   V8_DEPRECATED("Use maybe version",
                 Local<Value> CallAsFunction(Local<Value> recv, int argc,
                                             Local<Value> argv[]));
   V8_WARN_UNUSED_RESULT MaybeLocal<Value> CallAsFunction(Local<Context> context,
                                                          Local<Value> recv,
                                                          int argc,
                                                          Local<Value> argv[]);
@@ skipping 5733 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_