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