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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_ |
| 6 #define BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_ |
| 7 #pragma once |
| 8 |
| 9 #include "base/basictypes.h" |
| 10 |
| 11 namespace base { |
| 12 namespace mac { |
| 13 |
| 14 // BrowserCrApplication attempts to restrict throwing of NSExceptions |
| 15 // because they interact badly with C++ scoping rules. Unfortunately, |
| 16 // there are some cases where exceptions must be supported, such as |
| 17 // when third-party printer drivers are used. These helpers can be |
| 18 // used to enable exceptions for narrow windows. |
| 19 |
| 20 // Make it easy to safely allow NSException to be thrown in a limited |
| 21 // scope. Note that if an exception is thrown, then this object will |
| 22 // not be appropriately destructed! If the exception ends up in the |
| 23 // top-level event loop, things are cleared in -reportException:. If |
| 24 // the exception is caught at a lower level, a higher level scoper |
| 25 // should eventually reset things. |
| 26 class ScopedNSExceptionEnabler { |
| 27 public: |
| 28 ScopedNSExceptionEnabler(); |
| 29 ~ScopedNSExceptionEnabler(); |
| 30 |
| 31 private: |
| 32 bool was_enabled_; |
| 33 |
| 34 DISALLOW_COPY_AND_ASSIGN(ScopedNSExceptionEnabler); |
| 35 }; |
| 36 |
| 37 // Access the exception setting for the current thread. This is for |
| 38 // the support code in BrowserCrApplication, other code should use |
| 39 // the scoper. |
| 40 bool GetNSExceptionsAllowed(); |
| 41 void SetNSExceptionsAllowed(bool allowed); |
| 42 |
| 43 } // namespace mac |
| 44 } // namespace base |
| 45 |
| 46 #endif // BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_ |
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