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diff --git a/c_gate.cpp b/c_gate.cpp
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+// Copyright 2011 Google Inc.
+// 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.
+
+#include "c_gate.hpp"
+#include "state.ipp"
+
+
+/// Creates a new gateway to an existing C++ Lua state.
+///
+/// \param state_ The state to connect to.  This object must remain alive while
+///     the newly-constructed state_c_gate is alive.
+lutok::state_c_gate::state_c_gate(state& state_) :
+    _state(state_)
+{
+}
+
+
+/// Destructor.
+///
+/// Destroying this object has no implications on the life cycle of the Lua
+/// state.  Only the corresponding state object controls when the Lua state is
+/// closed.
+lutok::state_c_gate::~state_c_gate(void)
+{
+}
+
+
+/// Creates a C++ state for a C Lua state.
+///
+/// \warning The created state object does NOT own the C state.  You must take
+/// care to properly destroy the input lua_State when you are done with it to
+/// not leak resources.
+///
+/// \param raw_state The raw state to wrap temporarily.
+///
+/// \return The wrapped state without strong ownership on the input state.
+lutok::state
+lutok::state_c_gate::connect(lua_State* raw_state)
+{
+    return state(static_cast< void* >(raw_state));
+}
+
+
+/// Returns the C native Lua state.
+///
+/// \return A native lua_State object holding the Lua C API state.
+lua_State*
+lutok::state_c_gate::c_state(void)
+{
+    return static_cast< lua_State* >(_state.raw_state());
+}