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76 lines
1.7 KiB
76 lines
1.7 KiB
#ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED |
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#define BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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// detail/sp_convertible.hpp |
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// |
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// Copyright 2008 Peter Dimov |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt |
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#include <boost/config.hpp> |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE ) |
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# define BOOST_SP_NO_SP_CONVERTIBLE |
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#endif |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 ) |
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# define BOOST_SP_NO_SP_CONVERTIBLE |
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#endif |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x630 ) |
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# define BOOST_SP_NO_SP_CONVERTIBLE |
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#endif |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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namespace boost |
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{ |
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namespace detail |
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{ |
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template< class Y, class T > struct sp_convertible |
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{ |
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typedef char (&yes) [1]; |
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typedef char (&no) [2]; |
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static yes f( T* ); |
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static no f( ... ); |
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enum _vt { value = sizeof( (f)( static_cast<Y*>(0) ) ) == sizeof(yes) }; |
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}; |
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struct sp_empty |
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{ |
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}; |
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template< bool > struct sp_enable_if_convertible_impl; |
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template<> struct sp_enable_if_convertible_impl<true> |
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{ |
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typedef sp_empty type; |
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}; |
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template<> struct sp_enable_if_convertible_impl<false> |
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{ |
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}; |
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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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{ |
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}; |
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} // namespace detail |
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} // namespace boost |
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#endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
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