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1 // (C) Copyright Thorsten Ottosen 2005
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2 // (C) Copyright Howard Hinnant 2004
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3 // (C) Copyright Jonathan Turkanis 2004
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4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
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5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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6
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7 //
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8 // Contains type traits machinery for incomplete arrays. MPL compatibility
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9 // is included for completeness, but is not necessary for the current
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10 // application.
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11 //
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12
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13 #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
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14 #define BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
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15
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16 #include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
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17 #include <boost/mpl/aux_/lambda_support.hpp>
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18 #include <boost/mpl/and.hpp>
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19 #include <boost/mpl/bool.hpp>
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20 #include <boost/mpl/identity.hpp>
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21 #include <boost/mpl/if.hpp>
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22 #include <boost/type_traits/is_array.hpp>
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23 #include <boost/type_traits/is_convertible.hpp>
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24 #include <boost/type_traits/is_same.hpp>
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25 #include <boost/type_traits/remove_bounds.hpp>
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26 #include <boost/type_traits/remove_cv.hpp>
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27 #include <boost/utility/enable_if.hpp>
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28
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29 namespace boost { namespace ptr_container_detail { namespace move_ptrs {
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30
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31 // From Howard Hinnant.
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32 template<typename T, typename U>
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33 struct is_array_convertible {
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34 typedef typename remove_bounds<T>::type t_element;
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35 typedef typename remove_bounds<U>::type u_element;
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36 typedef typename remove_cv<t_element>::type t_base;
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37 typedef typename remove_cv<u_element>::type u_base;
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38 typedef typename
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39 mpl::and_<
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40 is_array<T>,
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41 is_array<U>,
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42 is_same<t_base, u_base>,
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43 is_convertible<t_element*, u_element*>
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44 >::type type;
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45 BOOST_STATIC_CONSTANT(bool, value = type::value);
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46 BOOST_MPL_AUX_LAMBDA_SUPPORT(2, is_array_convertible, (T, U))
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47 };
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48
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49 template<typename T, typename U>
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50 struct is_smart_ptr_convertible
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51 : mpl::if_<
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52 is_array<T>,
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53 is_array_convertible<T, U>,
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54 is_convertible<T*, U*>
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55 >::type
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56 { };
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57
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58 #ifndef BOOST_NO_SFINAE
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59 template<typename Src, typename Tgt, typename T = void>
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60 struct enable_if_convertible
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61 : enable_if<
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62 is_smart_ptr_convertible<Src, Tgt>,
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63 T
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64 >
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65 { };
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66 #else
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67 template<typename Src, typename Tgt, class T >
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68 struct enable_if_convertible : mpl::identity<T> { };
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69 #endif
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70
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71 } } } // End namespaces ptr_container_detail, move_ptrs, boost.
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72
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73 #endif // #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
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