// Three-state boolean logic library// Copyright Douglas Gregor 2002-2004. Use, modification and// distribution is subject to the Boost Software License, Version// 1.0. (See accompanying file LICENSE_1_0.txt or copy at// http://www.boost.org/LICENSE_1_0.txt)// For more information, see http://www.boost.org#ifndef BOOST_LOGIC_TRIBOOL_FWD_HPP#define BOOST_LOGIC_TRIBOOL_FWD_HPPnamespace boost { namespace logic { class tribool; } }#endif // BOOST_LOGIC_TRIBOOL_FWD_HPP