55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_
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#define BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_
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#import <Foundation/Foundation.h>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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namespace base {
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namespace mac {
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// BrowserCrApplication attempts to restrict throwing of NSExceptions
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// because they interact badly with C++ scoping rules. Unfortunately,
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// there are some cases where exceptions must be supported, such as
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// when third-party printer drivers are used. These helpers can be
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// used to enable exceptions for narrow windows.
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// Make it easy to safely allow NSException to be thrown in a limited
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// scope. Note that if an exception is thrown, then this object will
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// not be appropriately destructed! If the exception ends up in the
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// top-level event loop, things are cleared in -reportException:. If
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// the exception is caught at a lower level, a higher level scoper
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// should eventually reset things.
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class BASE_EXPORT ScopedNSExceptionEnabler {
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public:
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ScopedNSExceptionEnabler();
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~ScopedNSExceptionEnabler();
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private:
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bool was_enabled_;
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DISALLOW_COPY_AND_ASSIGN(ScopedNSExceptionEnabler);
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};
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// Access the exception setting for the current thread. This is for
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// the support code in BrowserCrApplication, other code should use
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// the scoper.
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BASE_EXPORT bool GetNSExceptionsAllowed();
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BASE_EXPORT void SetNSExceptionsAllowed(bool allowed);
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// Executes |block| with fatal-exceptions turned off, and returns the
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// result. If an exception is thrown during the perform, nil is
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// returned.
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typedef id (^BlockReturningId)();
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BASE_EXPORT id RunBlockIgnoringExceptions(BlockReturningId block);
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} // namespace mac
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} // namespace base
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#endif // BASE_MAC_SCOPED_NSEXCEPTION_ENABLER_H_
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