94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2012
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// Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the name Chromium Embedded
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// Framework nor the names of its contributors may be used to endorse
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// or promote products derived from this software without specific prior
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// written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This defines helpful methods for dealing with Callbacks. Because Callbacks
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// are implemented using templates, with a class per callback signature, adding
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// methods to Callback<> itself is unattractive (lots of extra code gets
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// generated). Instead, consider adding methods here.
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//
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// ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a
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// copy) after the original callback is Reset(). This can be handy if Run()
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// reads/writes the variable holding the Callback.
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#ifndef CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_
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#define CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_
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#pragma once
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#if defined(BASE_CALLBACK_HELPERS_H_)
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// Do nothing if the Chromium header has already been included.
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// This can happen in cases where Chromium code is used directly by the
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// client application. When using Chromium code directly always include
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// the Chromium header first to avoid type conflicts.
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#elif defined(BUILDING_CEF_SHARED)
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// When building CEF include the Chromium header directly.
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#include "base/callback_helpers.h"
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#else // !BUILDING_CEF_SHARED
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// The following is substantially similar to the Chromium implementation.
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// If the Chromium implementation diverges the below implementation should be
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// updated to match.
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#include "include/base/cef_basictypes.h"
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#include "include/base/cef_build.h"
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#include "include/base/cef_callback.h"
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#include "include/base/cef_macros.h"
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namespace base {
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template <typename Sig>
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base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) {
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base::Callback<Sig> ret(*cb);
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cb->Reset();
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return ret;
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}
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// ScopedClosureRunner is akin to scoped_ptr for Closures. It ensures that the
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// Closure is executed and deleted no matter how the current scope exits.
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class ScopedClosureRunner {
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public:
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ScopedClosureRunner();
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explicit ScopedClosureRunner(const Closure& closure);
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~ScopedClosureRunner();
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void Reset();
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void Reset(const Closure& closure);
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Closure Release() WARN_UNUSED_RESULT;
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private:
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Closure closure_;
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DISALLOW_COPY_AND_ASSIGN(ScopedClosureRunner);
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};
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} // namespace base
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#endif // !BUILDING_CEF_SHARED
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#endif // CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_
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