| 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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| 74 | |
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