Chris@16: // (C) Copyright Thorsten Ottosen 2005
Chris@16: // (C) Copyright Howard Hinnant 2004
Chris@16: // (C) Copyright Jonathan Turkanis 2004
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: //
Chris@16: // Contains type traits machinery for incomplete arrays. MPL compatibility
Chris@16: // is included for completeness, but is not necessary for the current 
Chris@16: // application.
Chris@16: // 
Chris@16: 
Chris@16: #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
Chris@16: #define BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
Chris@16: #include <boost/mpl/aux_/lambda_support.hpp>
Chris@16: #include <boost/mpl/and.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/mpl/identity.hpp>
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/type_traits/is_array.hpp>
Chris@16: #include <boost/type_traits/is_convertible.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: #include <boost/type_traits/remove_bounds.hpp>
Chris@16: #include <boost/type_traits/remove_cv.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: 
Chris@16: namespace boost { namespace ptr_container_detail { namespace move_ptrs {
Chris@16: 
Chris@16: // From Howard Hinnant.
Chris@16: template<typename T, typename U>
Chris@16: struct is_array_convertible {
Chris@16:     typedef typename remove_bounds<T>::type      t_element; 
Chris@16:     typedef typename remove_bounds<U>::type      u_element; 
Chris@16:     typedef typename remove_cv<t_element>::type  t_base; 
Chris@16:     typedef typename remove_cv<u_element>::type  u_base; 
Chris@16:     typedef typename 
Chris@16:             mpl::and_<
Chris@16:                 is_array<T>,
Chris@16:                 is_array<U>,
Chris@16:                 is_same<t_base, u_base>,
Chris@16:                 is_convertible<t_element*, u_element*>
Chris@16:             >::type                                     type;
Chris@16:     BOOST_STATIC_CONSTANT(bool, value = type::value);
Chris@16:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, is_array_convertible, (T, U))
Chris@16: };
Chris@16: 
Chris@16: template<typename T, typename U>
Chris@16: struct is_smart_ptr_convertible 
Chris@16:     : mpl::if_<
Chris@16:           is_array<T>,
Chris@16:           is_array_convertible<T, U>,
Chris@16:           is_convertible<T*, U*> 
Chris@16:       >::type
Chris@16:     { };
Chris@16: 
Chris@16: #ifndef BOOST_NO_SFINAE
Chris@16:     template<typename Src, typename Tgt, typename T = void>
Chris@16:     struct enable_if_convertible 
Chris@16:         : enable_if< 
Chris@16:               is_smart_ptr_convertible<Src, Tgt>,
Chris@16:               T
Chris@16:           >
Chris@16:         { };
Chris@16: #else
Chris@16:     template<typename Src, typename Tgt, class T >
Chris@16:     struct enable_if_convertible : mpl::identity<T> { };
Chris@16: #endif
Chris@16: 
Chris@16: } } }         // End namespaces ptr_container_detail, move_ptrs, boost.
Chris@16: 
Chris@16: #endif      // #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED