dom/bindings/UnionMember.h@97036ab72558
dom/bindings/UnionMember.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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/. */
7 /* A class for holding the members of a union. */
9 #ifndef mozilla_dom_UnionMember_h
10 #define mozilla_dom_UnionMember_h
12 #include "mozilla/Alignment.h"
14 namespace mozilla {
15 namespace dom {
17 // The union type has an enum to keep track of which of its UnionMembers has
18 // been constructed.
19 template<class T>
20 class UnionMember
21 {
22 AlignedStorage2<T> mStorage;
24 public:
25 T& SetValue()
26 {
27 new (mStorage.addr()) T();
28 return *mStorage.addr();
29 }
30 template <typename T1>
31 T& SetValue(const T1& aValue)
32 {
33 new (mStorage.addr()) T(aValue);
34 return *mStorage.addr();
35 }
36 template<typename T1, typename T2>
37 T& SetValue(const T1& aValue1, const T2& aValue2)
38 {
39 new (mStorage.addr()) T(aValue1, aValue2);
40 return *mStorage.addr();
41 }
42 T& Value()
43 {
44 return *mStorage.addr();
45 }
46 const T& Value() const
47 {
48 return *mStorage.addr();
49 }
50 void Destroy()
51 {
52 mStorage.addr()->~T();
53 }
54 };
56 } // namespace dom
57 } // namespace mozilla
59 #endif // mozilla_dom_UnionMember_h
