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  public:
LeakRefPtr(already_AddRefed<T> && aPtr)23   explicit LeakRefPtr(already_AddRefed<T>&& aPtr) : mRawPtr(aPtr.take()) {}
24 
25   explicit operator bool() const { return !!mRawPtr; }
26 
27   LeakRefPtr<T>& operator=(already_AddRefed<T>&& aPtr) {
28     mRawPtr = aPtr.take();
29     return *this;
30   }
31 
get()32   T* get() const { return mRawPtr; }
33 
take()34   already_AddRefed<T> take() {
35     T* rawPtr = mRawPtr;
36     mRawPtr = nullptr;
37     return already_AddRefed<T>(rawPtr);
38   }
39 
release()40   void release() { NS_RELEASE(mRawPtr); }
41 
42  private:
43   T* MOZ_OWNING_REF mRawPtr;
44 };
45 
46 }  // namespace mozilla
47 
48 #endif  // LeakRefPtr_h
49