xpcom/components/GenericFactory.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_GenericFactory_h
   8 #define mozilla_GenericFactory_h
   9
  10 #include "nsIFactory.h"
  11
  12 namespace mozilla {
  13
  14 /**
  15  * A generic factory which uses a constructor function to create instances.
  16  * This class is intended for use by the component manager and the generic
  17  * module.
  18  */
  19 class GenericFactory final : public nsIFactory {
  20   ~GenericFactory() = default;
  21
  22  public:
  23   typedef nsresult (*ConstructorProcPtr)(const nsIID& aIID, void** aResult);
  24
  25   NS_DECL_THREADSAFE_ISUPPORTS
  26   NS_DECL_NSIFACTORY
  27
  28   explicit GenericFactory(ConstructorProcPtr aCtor) : mCtor(aCtor) {
  29     NS_ASSERTION(mCtor, "GenericFactory with no constructor");
  30   }
  31
  32  private:
  33   ConstructorProcPtr mCtor;
  34 };
  35
  36 }  // namespace mozilla
  37
  38 #endif  // mozilla_GenericFactory_h