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//----------------------------------------------------------------------------- // boost blank.hpp header file // See http://www.boost.org for updates, documentation, and revision history. //----------------------------------------------------------------------------- // // Copyright (c) 2003 // Eric Friedman // // Distributed under 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) #ifndef BOOST_BLANK_HPP #define BOOST_BLANK_HPP #include "boost/blank_fwd.hpp" #if !defined(BOOST_NO_IOSTREAM) #include <iosfwd> // for std::basic_ostream forward declare #include "boost/detail/templated_streams.hpp" #endif // BOOST_NO_IOSTREAM #include "boost/mpl/bool.hpp" #include "boost/type_traits/is_empty.hpp" #include "boost/type_traits/is_pod.hpp" #include "boost/type_traits/is_stateless.hpp" namespace boost { struct blank { }; // type traits specializations // template <> struct is_pod< blank > : mpl::true_ { }; template <> struct is_empty< blank > : mpl::true_ { }; template <> struct is_stateless< blank > : mpl::true_ { }; // relational operators // inline bool operator==(const blank&, const blank&) { return true; } inline bool operator<=(const blank&, const blank&) { return true; } inline bool operator>=(const blank&, const blank&) { return true; } inline bool operator!=(const blank&, const blank&) { return false; } inline bool operator<(const blank&, const blank&) { return false; } inline bool operator>(const blank&, const blank&) { return false; } // streaming support // #if !defined(BOOST_NO_IOSTREAM) BOOST_TEMPLATED_STREAM_TEMPLATE(E,T) inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( BOOST_TEMPLATED_STREAM(ostream, E,T)& out , const blank& ) { // (output nothing) return out; } #endif // BOOST_NO_IOSTREAM } // namespace boost #endif // BOOST_BLANK_HPP