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