xpcom/reflect/xptcall/nsXPTCUtils.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 nsXPTCUtils_h__
   8 #define nsXPTCUtils_h__
   9
  10 #include "xptcall.h"
  11 #include "mozilla/MemoryReporting.h"
  12
  13 /**
  14  * A helper class that initializes an xptcall helper at construction
  15  * and releases it at destruction.
  16  */
  17 class nsAutoXPTCStub : protected nsIXPTCProxy {
  18  public:
  19   nsISomeInterface* mXPTCStub;
  20
  21  protected:
  22   nsAutoXPTCStub() : mXPTCStub(nullptr) {}
  23
  24   nsresult InitStub(const nsIID& aIID) {
  25     return NS_GetXPTCallStub(aIID, this, &mXPTCStub);
  26   }
  27
  28   ~nsAutoXPTCStub() {
  29     if (mXPTCStub) {
  30       NS_DestroyXPTCallStub(mXPTCStub);
  31     }
  32   }
  33
  34   size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
  35     return mXPTCStub
  36                ? NS_SizeOfIncludingThisXPTCallStub(mXPTCStub, aMallocSizeOf)
  37                : 0;
  38   }
  39 };
  40
  41 #endif  // nsXPTCUtils_h__