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:
nsAutoXPTCStub()22   nsAutoXPTCStub() : mXPTCStub(nullptr) {}
23 
InitStub(const nsIID & aIID)24   nsresult InitStub(const nsIID& aIID) {
25     return NS_GetXPTCallStub(aIID, this, &mXPTCStub);
26   }
27 
~nsAutoXPTCStub()28   ~nsAutoXPTCStub() {
29     if (mXPTCStub) {
30       NS_DestroyXPTCallStub(mXPTCStub);
31     }
32   }
33 
SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf)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__
42