michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /**
michael@0:  * A common base class for representing WebIDL callback function types in C++.
michael@0:  *
michael@0:  * This class implements common functionality like lifetime
michael@0:  * management, initialization with the callable, and setup of the call
michael@0:  * environment.  Subclasses corresponding to particular callback
michael@0:  * function types should provide a Call() method that actually does
michael@0:  * the call.
michael@0:  */
michael@0: 
michael@0: #ifndef mozilla_dom_CallbackFunction_h
michael@0: #define mozilla_dom_CallbackFunction_h
michael@0: 
michael@0: #include "mozilla/dom/CallbackObject.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: class CallbackFunction : public CallbackObject
michael@0: {
michael@0: public:
michael@0:   explicit CallbackFunction(JS::Handle<JSObject*> aCallable,
michael@0:                             nsIGlobalObject* aIncumbentGlobal)
michael@0:     : CallbackObject(aCallable, aIncumbentGlobal)
michael@0:   {
michael@0:   }
michael@0: 
michael@0:   JS::Handle<JSObject*> Callable() const
michael@0:   {
michael@0:     return Callback();
michael@0:   }
michael@0: 
michael@0:   bool HasGrayCallable() const
michael@0:   {
michael@0:     // Play it safe in case this gets called after unlink.
michael@0:     return mCallback && xpc_IsGrayGCThing(mCallback);
michael@0:   }
michael@0: 
michael@0: protected:
michael@0:   explicit CallbackFunction(CallbackFunction* aCallbackFunction)
michael@0:     : CallbackObject(aCallbackFunction)
michael@0:   {
michael@0:   }
michael@0: };
michael@0: 
michael@0: } // namespace dom
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif // mozilla_dom_CallbackFunction_h