projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // (C) Copyright Thorsten Ottosen 2005 |
| 2 | // (C) Copyright Howard Hinnant 2004 | |
| 3 | // (C) Copyright Jonathan Turkanis 2004 | |
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) | |
| 6 | ||
| 7 | // | |
| 8 | // Contains type traits machinery for incomplete arrays. MPL compatibility | |
| 9 | // is included for completeness, but is not necessary for the current | |
| 10 | // application. | |
| 11 | // | |
| 12 | ||
| 13 | #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED | |
| 14 | #define BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED | |
| 15 | ||
| 16 | #include <boost/config.hpp> // BOOST_STATIC_CONSTANT. | |
| 17 | #include <boost/mpl/aux_/lambda_support.hpp> | |
| 18 | #include <boost/mpl/and.hpp> | |
| 19 | #include <boost/mpl/bool.hpp> | |
| 20 | #include <boost/mpl/identity.hpp> | |
| 21 | #include <boost/mpl/if.hpp> | |
| 22 | #include <boost/type_traits/is_array.hpp> | |
| 23 | #include <boost/type_traits/is_convertible.hpp> | |
| 24 | #include <boost/type_traits/is_same.hpp> | |
| 25 | #include <boost/type_traits/remove_bounds.hpp> | |
| 26 | #include <boost/type_traits/remove_cv.hpp> | |
| 27 | #include <boost/utility/enable_if.hpp> | |
| 28 | ||
| 29 | namespace boost { namespace ptr_container_detail { namespace move_ptrs { | |
| 30 | ||
| 31 | // From Howard Hinnant. | |
| 32 | template<typename T, typename U> | |
| 33 | struct is_array_convertible { | |
| 34 | typedef typename remove_bounds<T>::type t_element; | |
| 35 | typedef typename remove_bounds<U>::type u_element; | |
| 36 | typedef typename remove_cv<t_element>::type t_base; | |
| 37 | typedef typename remove_cv<u_element>::type u_base; | |
| 38 | typedef typename | |
| 39 | mpl::and_< | |
| 40 | is_array<T>, | |
| 41 | is_array<U>, | |
| 42 | is_same<t_base, u_base>, | |
| 43 | is_convertible<t_element*, u_element*> | |
| 44 | >::type type; | |
| 45 | BOOST_STATIC_CONSTANT(bool, value = type::value); | |
| 46 | BOOST_MPL_AUX_LAMBDA_SUPPORT(2, is_array_convertible, (T, U)) | |
| 47 | }; | |
| 48 | ||
| 49 | template<typename T, typename U> | |
| 50 | struct is_smart_ptr_convertible | |
| 51 | : mpl::if_< | |
| 52 | is_array<T>, | |
| 53 | is_array_convertible<T, U>, | |
| 54 | is_convertible<T*, U*> | |
| 55 | >::type | |
| 56 | { }; | |
| 57 | ||
| 58 | #ifndef BOOST_NO_SFINAE | |
| 59 | template<typename Src, typename Tgt, typename T = void> | |
| 60 | struct enable_if_convertible | |
| 61 | : enable_if< | |
| 62 | is_smart_ptr_convertible<Src, Tgt>, | |
| 63 | T | |
| 64 | > | |
| 65 | { }; | |
| 66 | #else | |
| 67 | template<typename Src, typename Tgt, class T > | |
| 68 | struct enable_if_convertible : mpl::identity<T> { }; | |
| 69 | #endif | |
| 70 | ||
| 71 | } } } // End namespaces ptr_container_detail, move_ptrs, boost. | |
| 72 | ||
| 73 | #endif // #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED |