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diff --git a/store/layout_fwd.hpp b/store/layout_fwd.hpp
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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 store/layout_fwd.hpp
+/// Forward declarations for store/layout.hpp
+
+#if !defined(STORE_LAYOUT_FWD_HPP)
+#define STORE_LAYOUT_FWD_HPP
+
+#include <string>
+#include <utility>
+
+#include "utils/fs/path_fwd.hpp"
+
+namespace store {
+namespace layout {
+
+
+/// A pair with the user-visible ID of the results file and its path.
+///
+/// It is possible for the ID (first component) to be empty in the cases where
+/// the user explicitly requested to create the database in a specific path.
+typedef std::pair< std::string, utils::fs::path > results_id_file_pair;
+
+
+}  // namespace layout
+}  // namespace store
+
+#endif  // !defined(STORE_LAYOUT_FWD_HPP)