Sprout/sprout/weed/parser/auxiliary/eps.hpp
2016-02-25 18:48:28 +09:00

54 lines
1.8 KiB
C++

/*=============================================================================
Copyright (c) 2011-2016 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
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)
=============================================================================*/
#ifndef SPROUT_WEED_PARSER_AUXILIARY_EPS_HPP
#define SPROUT_WEED_PARSER_AUXILIARY_EPS_HPP
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/type_traits/identity.hpp>
#include <sprout/weed/unused.hpp>
#include <sprout/weed/parser_result.hpp>
#include <sprout/weed/parser/parser_base.hpp>
namespace sprout {
namespace weed {
//
// eps_p
//
struct eps_p
: public sprout::weed::parser_base
{
public:
template<typename Context, typename Iterator>
struct attribute
: public sprout::identity<sprout::weed::unused>
{};
template<typename Context, typename Iterator>
struct result
: public sprout::identity<sprout::weed::parser_result<Iterator, typename attribute<Context, Iterator>::type> >
{};
public:
template<typename Context, typename Iterator>
SPROUT_CONSTEXPR typename result<Context, Iterator>::type operator()(
Iterator first, Iterator,
Context const&
) const
{
typedef typename result<Context, Iterator>::type result_type;
typedef typename attribute<Context, Iterator>::type attribute_type;
return result_type(true, first, attribute_type());
}
};
//
// eps
//
SPROUT_STATIC_CONSTEXPR sprout::weed::eps_p eps = sprout::weed::eps_p();
} // namespace weed
} // namespace sprout
#endif // #ifndef SPROUT_WEED_PARSER_AUXILIARY_EPS_HPP