File: GenericFactory.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#ifndef mozilla_GenericFactory_h
#define mozilla_GenericFactory_h

#include "nsIFactory.h"

namespace mozilla {

/**
 * A generic factory which uses a constructor function to create instances.
 * This class is intended for use by the component manager and the generic
 * module.
 */
class GenericFactory final : public nsIFactory {
  ~GenericFactory() = default;

 public:
  typedef nsresult (*ConstructorProcPtr)(const nsIID& aIID, void** aResult);

  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIFACTORY

  explicit GenericFactory(ConstructorProcPtr aCtor) : mCtor(aCtor) {
    NS_ASSERTION(mCtor, "GenericFactory with no constructor");
  }

 private:
  ConstructorProcPtr mCtor;
};

}  // namespace mozilla

#endif  // mozilla_GenericFactory_h