1 #ifndef BOOST_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
2 #define BOOST_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
4 // MS compatible compilers support #pragma once
6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
10 // detail/sp_convertible.hpp
12 // Copyright 2008 Peter Dimov
14 // Distributed under the Boost Software License, Version 1.0.
15 // See accompanying file LICENSE_1_0.txt or copy at
16 // http://www.boost.org/LICENSE_1_0.txt
18 #include <boost/config.hpp>
20 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE )
21 # define BOOST_SP_NO_SP_CONVERTIBLE
24 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )
25 # define BOOST_SP_NO_SP_CONVERTIBLE
28 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x600 )
29 # define BOOST_SP_NO_SP_CONVERTIBLE
32 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
40 template< class Y, class T > struct sp_convertible
42 typedef char (&yes) [1];
43 typedef char (&no) [2];
48 enum _vt { value = sizeof( f( (Y*)0 ) ) == sizeof(yes) };
55 template< bool > struct sp_enable_if_convertible_impl;
57 template<> struct sp_enable_if_convertible_impl<true>
59 typedef sp_empty type;
62 template<> struct sp_enable_if_convertible_impl<false>
66 template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >
74 #endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE )
76 #endif // #ifndef BOOST_DETAIL_SP_TYPEINFO_HPP_INCLUDED