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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* vim:set ts=2 sw=2 sts=2 et cindent: */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /**

  * A common base class for representing WebIDL callback function types in C++.

  *

  * This class implements common functionality like lifetime

  * management, initialization with the callable, and setup of the call

  * environment.  Subclasses corresponding to particular callback

  * function types should provide a Call() method that actually does

  * the call.

  */

 #ifndef mozilla_dom_CallbackFunction_h

 #define mozilla_dom_CallbackFunction_h

 #include "mozilla/dom/CallbackObject.h"

 namespace mozilla {

 namespace dom {

 class CallbackFunction : public CallbackObject

 {

 public:

   explicit CallbackFunction(JS::Handle<JSObject*> aCallable,

                             nsIGlobalObject* aIncumbentGlobal)

     : CallbackObject(aCallable, aIncumbentGlobal)

   {

   }

   JS::Handle<JSObject*> Callable() const

   {

     return Callback();

   }

   bool HasGrayCallable() const

   {

     // Play it safe in case this gets called after unlink.

     return mCallback && xpc_IsGrayGCThing(mCallback);

   }

 protected:

   explicit CallbackFunction(CallbackFunction* aCallbackFunction)

     : CallbackObject(aCallbackFunction)

   {

   }

 };

 } // namespace dom

 } // namespace mozilla

 #endif // mozilla_dom_CallbackFunction_h