/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Copyright (c) 2013 Agustin Berge
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http://spirit.sourceforge.net/
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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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#if !defined(BOOST_SPIRIT_X3_SUBCONTEXT_APR_15_2013_0840AM)
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#define BOOST_SPIRIT_X3_SUBCONTEXT_APR_15_2013_0840AM
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#include <boost/spirit/home/x3/support/context.hpp>
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#include <boost/spirit/home/x3/support/unused.hpp>
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namespace boost { namespace spirit { namespace x3
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{
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template <typename... T>
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struct subcontext;
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template <>
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struct subcontext<>
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{
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template <typename Context>
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subcontext(Context const& /*context*/)
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{}
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template <typename ID_>
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unused_type
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get(ID_) const
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{
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return unused;
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}
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};
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template <typename T>
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struct subcontext<T>
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: context<typename T::first_type, typename T::second_type>
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{
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typedef context<
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typename T::first_type, typename T::second_type
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> context_type;
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template <typename Context>
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subcontext(Context const& context)
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: context_type(x3::get<typename T::first_type>(context))
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{}
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using context_type::get;
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};
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template <typename T, typename... Tail>
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struct subcontext<T, Tail...>
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: subcontext<Tail...>
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, context<
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typename T::first_type, typename T::second_type
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, subcontext<Tail...>
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>
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{
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typedef subcontext<Tail...> base_type;
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typedef context<
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typename T::first_type, typename T::second_type
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, base_type
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> context_type;
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template <typename Context>
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subcontext(Context const& context)
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: base_type(context)
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, context_type(
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x3::get<typename T::first_type>(context)
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, *static_cast<base_type*>(this))
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{}
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using context_type::get;
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};
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}}}
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#endif
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