chromium/ui/gfx/x/future.h

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_X_FUTURE_H_
#define UI_GFX_X_FUTURE_H_

#include "base/component_export.h"
#include "ui/gfx/x/xproto_types.h"

namespace x11 {

class Connection;
class Event;

class COMPONENT_EXPORT(X11) FutureImpl { … };

class COMPONENT_EXPORT(X11) FutureBase { … };

// An Future wraps an asynchronous response from the X11 server.  The
// response may be waited-for with Sync(), or asynchronously handled by
// installing a response handler using OnResponse().
template <typename Reply>
class Future : public FutureBase { … };

// Sync() specialization for requests that don't generate replies.  The returned
// response will only contain an error if there was one.
template <>
inline Response<void> Future<void>::Sync() { … }

// OnResponse() specialization for requests that don't generate replies.  The
// response argument to |callback| will only contain an error if there was one.
template <>
inline void Future<void>::OnResponse(Callback callback) { … }

}  // namespace x11

#endif  //  UI_GFX_X_FUTURE_H_