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.)
8 // Contains type traits machinery for incomplete arrays. MPL compatibility
9 // is included for completeness, but is not necessary for the current
13 #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
14 #define BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
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>
29 namespace boost { namespace ptr_container_detail { namespace move_ptrs {
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;
42 is_same<t_base, u_base>,
43 is_convertible<t_element*, u_element*>
45 BOOST_STATIC_CONSTANT(bool, value = type::value);
46 BOOST_MPL_AUX_LAMBDA_SUPPORT(2, is_array_convertible, (T, U))
49 template<typename T, typename U>
50 struct is_smart_ptr_convertible
53 is_array_convertible<T, U>,
54 is_convertible<T*, U*>
58 #ifndef BOOST_NO_SFINAE
59 template<typename Src, typename Tgt, typename T = void>
60 struct enable_if_convertible
62 is_smart_ptr_convertible<Src, Tgt>,
67 template<typename Src, typename Tgt, class T >
68 struct enable_if_convertible : mpl::identity<T> { };
71 } } } // End namespaces ptr_container_detail, move_ptrs, boost.
73 #endif // #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED