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+// Copyright 2015 The Kyua Authors.
+// All rights reserved.
+//
+// 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 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.
+
+/// \file engine/scheduler_fwd.hpp
+/// Forward declarations for engine/scheduler.hpp
+
+#if !defined(ENGINE_SCHEDULER_FWD_HPP)
+#define ENGINE_SCHEDULER_FWD_HPP
+
+#include <memory>
+
+namespace engine {
+namespace scheduler {
+
+
+/// Unique identifier for in-flight execution operations.
+///
+/// TODO(jmmv): Might be worth to drop altogether and just use "int". The type
+/// difference with executor::exec_handle is confusing.
+typedef int exec_handle;
+
+
+class scheduler_handle;
+class interface;
+class result_handle;
+class test_result_handle;
+
+
+/// Pointer to a dynamically-allocated result_handle.
+typedef std::shared_ptr< result_handle > result_handle_ptr;
+
+
+} // namespace scheduler
+} // namespace engine
+
+#endif // !defined(ENGINE_SCHEDULER_FWD_HPP)