no bug - Bumping Firefox l10n changesets r=release a=l10n-bump DONTBUILD CLOSED TREE
[gecko.git] / mfbt / ReentrancyGuard.h
blob56c963b4188e2e249580fade0dd73540e5f02406
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 /* Small helper class for asserting uses of a class are non-reentrant. */
9 #ifndef mozilla_ReentrancyGuard_h
10 #define mozilla_ReentrancyGuard_h
12 #include "mozilla/Assertions.h"
13 #include "mozilla/Attributes.h"
15 namespace mozilla {
17 /* Useful for implementing containers that assert non-reentrancy */
18 class MOZ_RAII ReentrancyGuard {
19 #ifdef DEBUG
20 bool& mEntered;
21 #endif
23 public:
24 template <class T>
25 #ifdef DEBUG
26 explicit ReentrancyGuard(T& aObj)
27 : mEntered(aObj.mEntered)
28 #else
29 explicit ReentrancyGuard(T&)
30 #endif
32 #ifdef DEBUG
33 MOZ_ASSERT(!mEntered);
34 mEntered = true;
35 #endif
37 ~ReentrancyGuard() {
38 #ifdef DEBUG
39 mEntered = false;
40 #endif
43 private:
44 ReentrancyGuard(const ReentrancyGuard&) = delete;
45 void operator=(const ReentrancyGuard&) = delete;
48 } // namespace mozilla
50 #endif /* mozilla_ReentrancyGuard_h */