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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