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86 lines
2.6 KiB
86 lines
2.6 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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// as_modifier.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MODIFIER_HPP_EAN_04_05_2007
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#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MODIFIER_HPP_EAN_04_05_2007
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/mpl/sizeof.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/static/static.hpp>
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#include <boost/proto/core.hpp>
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#define UNCV(x) typename remove_const<x>::type
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#define UNREF(x) typename remove_reference<x>::type
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#define UNCVREF(x) UNCV(UNREF(x))
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// regex operator tags
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struct modifier_tag
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{};
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}}}
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namespace boost { namespace xpressive { namespace grammar_detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// as_modifier
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template<typename Grammar, typename Callable = proto::callable>
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struct as_modifier : proto::transform<as_modifier<Grammar, Callable> >
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{
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template<typename Expr, typename State, typename Data>
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struct impl : proto::transform_impl<Expr, State, Data>
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{
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typedef
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typename proto::result_of::value<
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typename proto::result_of::left<typename impl::expr>::type
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>::type
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modifier_type;
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typedef
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typename modifier_type::template apply<typename impl::data>::type
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visitor_type;
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typedef
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typename proto::result_of::right<Expr>::type
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expr_type;
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typedef
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typename Grammar::template impl<expr_type, State, visitor_type &>::result_type
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result_type;
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result_type operator ()(
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typename impl::expr_param expr
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, typename impl::state_param state
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, typename impl::data_param data
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) const
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{
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visitor_type new_visitor(proto::value(proto::left(expr)).call(data));
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return typename Grammar::template impl<expr_type, State, visitor_type &>()(
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proto::right(expr)
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, state
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, new_visitor
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);
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}
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};
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};
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}}}
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#undef UNCV
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#undef UNREF
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#undef UNCVREF
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#endif
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