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 /* Smart pointer which leaks its owning refcounted object by default. */
8 
9 #ifndef LeakRefPtr_h
10 #define LeakRefPtr_h
11 
12 #include "mozilla/AlreadyAddRefed.h"
13 
14 namespace mozilla {
15 
16 /**
17  * Instance of this class behaves like a raw pointer which leaks the
18  * resource it's owning if not explicitly released.
19  */
20 template<class T>
21 class LeakRefPtr
22 {
23 public:
LeakRefPtr(already_AddRefed<T> && aPtr)24   explicit LeakRefPtr(already_AddRefed<T>&& aPtr)
25     : mRawPtr(aPtr.take()) { }
26 
27   explicit operator bool() const { return !!mRawPtr; }
28 
29   LeakRefPtr<T>& operator=(already_AddRefed<T>&& aPtr)
30   {
31     mRawPtr = aPtr.take();
32     return *this;
33   }
34 
get()35   T* get() const { return mRawPtr; }
36 
take()37   already_AddRefed<T> take()
38   {
39     T* rawPtr = mRawPtr;
40     mRawPtr = nullptr;
41     return already_AddRefed<T>(rawPtr);
42   }
43 
release()44   void release() { NS_RELEASE(mRawPtr); }
45 
46 private:
47   T* MOZ_OWNING_REF mRawPtr;
48 };
49 
50 } // namespace mozilla
51 
52 #endif // LeakRefPtr_h
53