cefpython/src/include/base/cef_callback_helpers.h at cefpython51 · pythonthings/cefpython · GitHub

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// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// * Neither the name of Google Inc. nor the name Chromium Embedded

// Framework nor the names of its contributors may be used to endorse

// or promote products derived from this software without specific prior

// written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// This defines helpful methods for dealing with Callbacks. Because Callbacks

// are implemented using templates, with a class per callback signature, adding

// methods to Callback<> itself is unattractive (lots of extra code gets

// generated). Instead, consider adding methods here.

// ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a

// copy) after the original callback is Reset(). This can be handy if Run()

// reads/writes the variable holding the Callback.

#ifndef CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_

#define CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_

#pragma once

#if defined(BASE_CALLBACK_HELPERS_H_)

// Do nothing if the Chromium header has already been included.

// This can happen in cases where Chromium code is used directly by the

// client application. When using Chromium code directly always include

// the Chromium header first to avoid type conflicts.

#elif defined(USING_CHROMIUM_INCLUDES)

// When building CEF include the Chromium header directly.

#include "base/callback_helpers.h"

#else // !USING_CHROMIUM_INCLUDES

// The following is substantially similar to the Chromium implementation.

// If the Chromium implementation diverges the below implementation should be

// updated to match.

#include "include/base/cef_basictypes.h"

#include "include/base/cef_build.h"

#include "include/base/cef_callback.h"

#include "include/base/cef_macros.h"

namespace base {

template <typename Sig>

base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) {

base::Callback<Sig> ret(*cb);

cb->Reset();

return ret;

}

// ScopedClosureRunner is akin to scoped_ptr for Closures. It ensures that the

// Closure is executed and deleted no matter how the current scope exits.

class ScopedClosureRunner {

public:

ScopedClosureRunner();

explicit ScopedClosureRunner(const Closure& closure);

~ScopedClosureRunner();

void Reset();

void Reset(const Closure& closure);

Closure Release() WARN_UNUSED_RESULT;

private:

Closure closure_;

DISALLOW_COPY_AND_ASSIGN(ScopedClosureRunner);

};

} // namespace base

#endif // !USING_CHROMIUM_INCLUDES

#endif // CEF_INCLUDE_BASE_CEF_CALLBACK_HELPERS_H_

cefpython/src/include/base/cef_callback_helpers.h at cefpython51 · pythonthings/cefpython · GitHub

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