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+// Copyright 2011 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 c_gate.hpp
+/// Provides direct access to the C state of the SQLite wrappers.
+
+#if !defined(UTILS_SQLITE_C_GATE_HPP)
+#define UTILS_SQLITE_C_GATE_HPP
+
+#include "utils/sqlite/c_gate_fwd.hpp"
+
+extern "C" {
+#include <sqlite3.h>
+}
+
+#include "utils/sqlite/database_fwd.hpp"
+
+namespace utils {
+namespace sqlite {
+
+
+/// Gateway to the raw C database of SQLite 3.
+///
+/// This class provides a mechanism to muck with the internals of the database
+/// wrapper class.
+///
+/// \warning The use of this class is discouraged.  By using this class, you are
+/// entering the world of unsafety.  Anything you do through the objects exposed
+/// through this class will not be controlled by RAII patterns not validated in
+/// any other way, so you can end up corrupting the SQLite 3 state and later get
+/// crashes on otherwise perfectly-valid C++ code.
+class database_c_gate {
+    /// The C++ database that this class wraps.
+    database& _database;
+
+public:
+    database_c_gate(database&);
+    ~database_c_gate(void);
+
+    static database connect(::sqlite3*);
+
+    ::sqlite3* c_database(void);
+};
+
+
+}  // namespace sqlite
+}  // namespace utils
+
+#endif  // !defined(UTILS_SQLITE_C_GATE_HPP)