// (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 |