65 lines
2.1 KiB
Plaintext
65 lines
2.1 KiB
Plaintext
|
/*==============================================================================
|
||
|
|
Copyright (c) 2001-2010 Joel de Guzman
|
||
|
|
Copyright (c) 2010 Thomas Heller
|
||
|
|
|
||
|
|
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)
|
||
|
|
==============================================================================*/
|
||
|
|
#ifndef BOOST_PHOENIX_OBJECT_DYNAMIC_CAST_HPP
|
||
|
|
#define BOOST_PHOENIX_OBJECT_DYNAMIC_CAST_HPP
|
||
|
|
|
||
|
|
#include <boost/phoenix/core/limits.hpp>
|
||
|
|
#include <boost/phoenix/core/call.hpp>
|
||
|
|
#include <boost/phoenix/core/expression.hpp>
|
||
|
|
#include <boost/phoenix/core/meta_grammar.hpp>
|
||
|
|
#include <boost/phoenix/object/detail/target.hpp>
|
||
|
|
#include <boost/proto/transform/lazy.hpp>
|
||
|
|
|
||
|
|
BOOST_PHOENIX_DEFINE_EXPRESSION(
|
||
|
|
(boost)(phoenix)(dynamic_cast_)
|
||
|
|
, (proto::terminal<detail::target<proto::_> >)
|
||
|
|
(meta_grammar)
|
||
|
|
)
|
||
|
|
|
||
|
|
namespace boost { namespace phoenix
|
||
|
|
{
|
||
|
|
struct dynamic_cast_eval
|
||
|
|
{
|
||
|
|
template <typename Sig>
|
||
|
|
struct result;
|
||
|
|
|
||
|
|
template <typename This, typename Target, typename Source, typename Context>
|
||
|
|
struct result<This(Target, Source, Context)>
|
||
|
|
: detail::result_of::target<Target>
|
||
|
|
{};
|
||
|
|
|
||
|
|
template <typename Target, typename Source, typename Context>
|
||
|
|
typename detail::result_of::target<Target>::type
|
||
|
|
operator()(Target, Source const& u, Context const& ctx) const
|
||
|
|
{
|
||
|
|
return
|
||
|
|
dynamic_cast<
|
||
|
|
typename detail::result_of::target<Target>::type
|
||
|
|
>(boost::phoenix::eval(u, ctx));
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
template <typename Dummy>
|
||
|
|
struct default_actions::when<rule::dynamic_cast_, Dummy>
|
||
|
|
: call<dynamic_cast_eval, Dummy>
|
||
|
|
{};
|
||
|
|
|
||
|
|
template <typename T, typename U>
|
||
|
|
inline
|
||
|
|
typename expression::dynamic_cast_<detail::target<T>, U>::type const
|
||
|
|
dynamic_cast_(U const& u)
|
||
|
|
{
|
||
|
|
return
|
||
|
|
expression::
|
||
|
|
dynamic_cast_<detail::target<T>, U>::
|
||
|
|
make(detail::target<T>(), u);
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif
|