#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__ < 0x630 ) # 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( static_cast<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