[1022] | 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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