#ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED

#define BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED

// MS compatible compilers support #pragma once

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

# pragma once

#endif

//  detail/sp_convertible.hpp

//

//  Copyright 2008 Peter Dimov

//

//  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

#include <boost/config.hpp>

#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE )

# define BOOST_SP_NO_SP_CONVERTIBLE

#endif

#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )

# define BOOST_SP_NO_SP_CONVERTIBLE

#endif

#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ <= 0x610 )

# define BOOST_SP_NO_SP_CONVERTIBLE

#endif

#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )

namespace boost

{

namespace detail

{

template< class Y, class T > struct sp_convertible

{

    typedef char (&yes) [1];

    typedef char (&no)  [2];

    static yes f( T* );

    static no  f( ... );

    enum _vt { value = sizeof( f( (Y*)0 ) ) == sizeof(yes) };

};

struct sp_empty

{

};

template< bool > struct sp_enable_if_convertible_impl;

template<> struct sp_enable_if_convertible_impl<true>

{

    typedef sp_empty type;

};

template<> struct sp_enable_if_convertible_impl<false>

{

};

template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >

{

};

} // namespace detail

} // namespace boost

#endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE )

#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED