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