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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3 | |
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4 | // MS compatible compilers support #pragma once |
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5 | |
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6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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7 | # pragma once |
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8 | #endif |
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9 | |
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10 | // detail/sp_convertible.hpp |
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11 | // |
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12 | // Copyright 2008 Peter Dimov |
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13 | // |
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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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17 | |
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18 | #include <boost/config.hpp> |
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19 | |
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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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22 | #endif |
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23 | |
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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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26 | #endif |
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27 | |
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28 | #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x630 ) |
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29 | # define BOOST_SP_NO_SP_CONVERTIBLE |
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30 | #endif |
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31 | |
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32 | #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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33 | |
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34 | namespace boost |
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35 | { |
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36 | |
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37 | namespace detail |
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38 | { |
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39 | |
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40 | template< class Y, class T > struct sp_convertible |
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41 | { |
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42 | typedef char (&yes) [1]; |
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43 | typedef char (&no) [2]; |
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44 | |
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45 | static yes f( T* ); |
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46 | static no f( ... ); |
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47 | |
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48 | enum _vt { value = sizeof( (f)( static_cast<Y*>(0) ) ) == sizeof(yes) }; |
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49 | }; |
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50 | |
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51 | struct sp_empty |
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52 | { |
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53 | }; |
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54 | |
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55 | template< bool > struct sp_enable_if_convertible_impl; |
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56 | |
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57 | template<> struct sp_enable_if_convertible_impl<true> |
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58 | { |
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59 | typedef sp_empty type; |
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60 | }; |
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61 | |
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62 | template<> struct sp_enable_if_convertible_impl<false> |
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63 | { |
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64 | }; |
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65 | |
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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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67 | { |
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68 | }; |
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69 | |
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70 | } // namespace detail |
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71 | |
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72 | } // namespace boost |
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73 | |
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74 | #endif // !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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75 | |
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76 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_CONVERTIBLE_HPP_INCLUDED |
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