/*=============================================================================
    Copyright (c) 2001-2014 Joel de Guzman

    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_OMIT_MARCH_24_2007_0802AM)
#define BOOST_SPIRIT_X3_OMIT_MARCH_24_2007_0802AM

#include <boost/spirit/home/x3/support/unused.hpp>
#include <boost/spirit/home/x3/core/parser.hpp>

namespace boost {
namespace spirit {
namespace x3 {
///////////////////////////////////////////////////////////////////////////
// omit_directive forces the attribute of subject parser
// to be unused_type
///////////////////////////////////////////////////////////////////////////
template <typename Subject>
struct omit_directive : unary_parser<Subject, omit_directive<Subject>>
{
    typedef unary_parser<Subject, omit_directive<Subject> > base_type;
    typedef unused_type attribute_type;
    static bool const has_attribute = false;

    typedef Subject subject_type;
    constexpr
    omit_directive(Subject const& subject)
        : base_type(subject) {}

    template <typename Iterator, typename Context, typename RContext>
    bool
    parse(Iterator& first, Iterator const& last
          , Context const& context, RContext& rcontext, unused_type) const
    {
        return this->subject.parse(first, last, context, rcontext, unused);
    }
};

struct omit_gen
{
    template <typename Subject>
    constexpr omit_directive<typename extension::as_parser<Subject>::value_type>
    operator[](Subject const& subject) const
    {
        return { as_parser(subject) };
    }
};

constexpr auto omit = omit_gen{};
}
}
}

#endif
