1 #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
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2 #define BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
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4 // MS compatible compilers support #pragma once
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6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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10 // detail/sp_convertible.hpp
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12 // Copyright 2008 Peter Dimov
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14 // Distributed under the Boost Software License, Version 1.0.
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15 // See accompanying file LICENSE_1_0.txt or copy at
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16 // http://www.boost.org/LICENSE_1_0.txt
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18 #include <boost/config.hpp>
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20 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE )
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21 # define BOOST_SP_NO_SP_CONVERTIBLE
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24 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )
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25 # define BOOST_SP_NO_SP_CONVERTIBLE
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28 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ <= 0x620 )
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29 # define BOOST_SP_NO_SP_CONVERTIBLE
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32 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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40 template< class Y, class T > struct sp_convertible
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42 typedef char (&yes) [1];
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43 typedef char (&no) [2];
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48 enum _vt { value = sizeof( f( static_cast<Y*>(0) ) ) == sizeof(yes) };
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55 template< bool > struct sp_enable_if_convertible_impl;
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57 template<> struct sp_enable_if_convertible_impl<true>
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59 typedef sp_empty type;
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62 template<> struct sp_enable_if_convertible_impl<false>
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66 template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >
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70 } // namespace detail
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72 } // namespace boost
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74 #endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE )
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76 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
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