forked from boostorg/smart_ptr
93 lines
2.1 KiB
C++
93 lines
2.1 KiB
C++
#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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#include <cstddef>
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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( BOOST_BORLANDC ) && ( BOOST_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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template< class Y, class T > struct sp_convertible< Y, T[] >
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{
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enum _vt { value = false };
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};
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template< class Y, class T > struct sp_convertible< Y[], T[] >
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{
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enum _vt { value = sp_convertible< Y[1], T[1] >::value };
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};
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template< class Y, std::size_t N, class T > struct sp_convertible< Y[N], T[] >
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{
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enum _vt { value = sp_convertible< Y[1], T[1] >::value };
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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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