williamr@4: // (C) Copyright Thorsten Ottosen 2005
williamr@4: // (C) Copyright Howard Hinnant 2004
williamr@4: // (C) Copyright Jonathan Turkanis 2004
williamr@4: // Distributed under the Boost Software License, Version 1.0. (See accompanying
williamr@4: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
williamr@2: 
williamr@2: //
williamr@4: // Contains type traits machinery for incomplete arrays. MPL compatibility
williamr@4: // is included for completeness, but is not necessary for the current 
williamr@4: // application.
williamr@4: // 
williamr@2: 
williamr@4: #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
williamr@4: #define BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED
williamr@2: 
williamr@4: #include <boost/config.hpp> // BOOST_STATIC_CONSTANT.
williamr@4: #include <boost/mpl/aux_/lambda_support.hpp>
williamr@4: #include <boost/mpl/and.hpp>
williamr@4: #include <boost/mpl/bool.hpp>
williamr@4: #include <boost/mpl/identity.hpp>
williamr@4: #include <boost/mpl/if.hpp>
williamr@2: #include <boost/type_traits/is_array.hpp>
williamr@4: #include <boost/type_traits/is_convertible.hpp>
williamr@4: #include <boost/type_traits/is_same.hpp>
williamr@4: #include <boost/type_traits/remove_bounds.hpp>
williamr@4: #include <boost/type_traits/remove_cv.hpp>
williamr@4: #include <boost/utility/enable_if.hpp>
williamr@4: 
williamr@4: namespace boost { namespace ptr_container_detail { namespace move_ptrs {
williamr@4: 
williamr@4: // From Howard Hinnant.
williamr@4: template<typename T, typename U>
williamr@4: struct is_array_convertible {
williamr@4:     typedef typename remove_bounds<T>::type      t_element; 
williamr@4:     typedef typename remove_bounds<U>::type      u_element; 
williamr@4:     typedef typename remove_cv<t_element>::type  t_base; 
williamr@4:     typedef typename remove_cv<u_element>::type  u_base; 
williamr@4:     typedef typename 
williamr@4:             mpl::and_<
williamr@4:                 is_array<T>,
williamr@4:                 is_array<U>,
williamr@4:                 is_same<t_base, u_base>,
williamr@4:                 is_convertible<t_element*, u_element*>
williamr@4:             >::type                                     type;
williamr@4:     BOOST_STATIC_CONSTANT(bool, value = type::value);
williamr@4:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, is_array_convertible, (T, U))
williamr@4: };
williamr@4: 
williamr@4: template<typename T, typename U>
williamr@4: struct is_smart_ptr_convertible 
williamr@4:     : mpl::if_<
williamr@4:           is_array<T>,
williamr@4:           is_array_convertible<T, U>,
williamr@4:           is_convertible<T*, U*> 
williamr@4:       >::type
williamr@4:     { };
williamr@4: 
williamr@4: #ifndef BOOST_NO_SFINAE
williamr@4:     template<typename Src, typename Tgt, typename T = void>
williamr@4:     struct enable_if_convertible 
williamr@4:         : enable_if< 
williamr@4:               is_smart_ptr_convertible<Src, Tgt>,
williamr@4:               T
williamr@4:           >
williamr@4:         { };
williamr@4: #else
williamr@4:     template<typename Src, typename Tgt, class T >
williamr@4:     struct enable_if_convertible : mpl::identity<T> { };
williamr@2: #endif
williamr@2: 
williamr@4: } } }         // End namespaces ptr_container_detail, move_ptrs, boost.
williamr@2: 
williamr@4: #endif      // #ifndef BOOST_MOVE_PTR_ARRAYS_HPP_INCLUDED