Chris@16: #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
Chris@16: #define BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: //  detail/sp_convertible.hpp
Chris@16: //
Chris@16: //  Copyright 2008 Peter Dimov
Chris@16: //
Chris@16: //  Distributed under the Boost Software License, Version 1.0.
Chris@16: //  See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@101: #include <cstddef>
Chris@16: 
Chris@16: #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( BOOST_NO_SFINAE )
Chris@16: # define BOOST_SP_NO_SP_CONVERTIBLE
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )
Chris@16: # define BOOST_SP_NO_SP_CONVERTIBLE
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x630 )
Chris@16: # define BOOST_SP_NO_SP_CONVERTIBLE
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@16: namespace detail
Chris@16: {
Chris@16: 
Chris@16: template< class Y, class T > struct sp_convertible
Chris@16: {
Chris@16:     typedef char (&yes) [1];
Chris@16:     typedef char (&no)  [2];
Chris@16: 
Chris@16:     static yes f( T* );
Chris@16:     static no  f( ... );
Chris@16: 
Chris@16:     enum _vt { value = sizeof( (f)( static_cast<Y*>(0) ) ) == sizeof(yes) };
Chris@16: };
Chris@16: 
Chris@16: template< class Y, class T > struct sp_convertible< Y, T[] >
Chris@16: {
Chris@16:     enum _vt { value = false };
Chris@16: };
Chris@16: 
Chris@16: template< class Y, class T > struct sp_convertible< Y[], T[] >
Chris@16: {
Chris@16:     enum _vt { value = sp_convertible< Y[1], T[1] >::value };
Chris@16: };
Chris@16: 
Chris@16: template< class Y, std::size_t N, class T > struct sp_convertible< Y[N], T[] >
Chris@16: {
Chris@16:     enum _vt { value = sp_convertible< Y[1], T[1] >::value };
Chris@16: };
Chris@16: 
Chris@16: struct sp_empty
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: template< bool > struct sp_enable_if_convertible_impl;
Chris@16: 
Chris@16: template<> struct sp_enable_if_convertible_impl<true>
Chris@16: {
Chris@16:     typedef sp_empty type;
Chris@16: };
Chris@16: 
Chris@16: template<> struct sp_enable_if_convertible_impl<false>
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: template< class Y, class T > struct sp_enable_if_convertible: public sp_enable_if_convertible_impl< sp_convertible< Y, T >::value >
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE )
Chris@16: 
Chris@16: #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED