#ifndef BOOST_STRONG_TYPEDEF_HPP

#define BOOST_STRONG_TYPEDEF_HPP

// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)

# pragma once

#endif

/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

// strong_typedef.hpp:

// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 

// 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)

//  See http://www.boost.org for updates, documentation, and revision history.

// macro used to implement a strong typedef.  strong typedef

// guarentees that two types are distinguised even though the

// share the same underlying implementation.  typedef does not create

// a new type.  BOOST_STRONG_TYPEDEF(T, D) creates a new type named D

// that operates as a type T.

#include <boost/operators.hpp>

#define BOOST_STRONG_TYPEDEF(T, D)                              \

struct D                                                        \

    : boost::totally_ordered1< D                                \

    , boost::totally_ordered2< D, T                             \

    > >                                                         \

{                                                               \

    T t;                                                        \

    explicit D(const T t_) : t(t_) {};                          \

    D(){};                                                      \

    D(const D & t_) : t(t_.t){}                                 \

    D & operator=(const D & rhs) { t = rhs.t; return *this;}    \

    D & operator=(const T & rhs) { t = rhs; return *this;}      \

    operator const T & () const {return t; }                    \

    operator T & () { return t; }                               \

    bool operator==(const D & rhs) const { return t == rhs.t; } \

    bool operator<(const D & rhs) const { return t < rhs.t; }   \

};

#endif // BOOST_STRONG_TYPEDEF_HPP