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