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