1/*==============================================================================
2 Copyright (c) 2001-2010 Joel de Guzman
3 Copyright (c) 2010 Thomas Heller
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7==============================================================================*/
8#ifndef BOOST_PHOENIX_OBJECT_DYNAMIC_CAST_HPP
9#define BOOST_PHOENIX_OBJECT_DYNAMIC_CAST_HPP
10
11#include <boost/phoenix/core/limits.hpp>
12#include <boost/phoenix/core/call.hpp>
13#include <boost/phoenix/core/expression.hpp>
14#include <boost/phoenix/core/meta_grammar.hpp>
15#include <boost/phoenix/object/detail/target.hpp>
16#include <boost/proto/transform/lazy.hpp>
17
18BOOST_PHOENIX_DEFINE_EXPRESSION(
19 (boost)(phoenix)(dynamic_cast_)
20 , (proto::terminal<detail::target<proto::_> >)
21 (meta_grammar)
22)
23
24namespace boost { namespace phoenix
25{
26 struct dynamic_cast_eval
27 {
28 template <typename Sig>
29 struct result;
30
31 template <typename This, typename Target, typename Source, typename Context>
32 struct result<This(Target, Source, Context)>
33 : detail::result_of::target<Target>
34 {};
35
36 template <typename Target, typename Source, typename Context>
37 typename detail::result_of::target<Target>::type
38 operator()(Target, Source const& u, Context const& ctx) const
39 {
40 return
41 dynamic_cast<
42 typename detail::result_of::target<Target>::type
43 >(boost::phoenix::eval(u, ctx));
44 }
45 };
46
47 template <typename Dummy>
48 struct default_actions::when<rule::dynamic_cast_, Dummy>
49 : call<dynamic_cast_eval, Dummy>
50 {};
51
52 template <typename T, typename U>
53 inline
54 typename expression::dynamic_cast_<detail::target<T>, U>::type const
55 dynamic_cast_(U const& u)
56 {
57 return
58 expression::
59 dynamic_cast_<detail::target<T>, U>::
60 make(detail::target<T>(), u);
61 }
62}}
63
64#endif
65

source code of boost/libs/phoenix/include/boost/phoenix/object/dynamic_cast.hpp