Sprout/sprout/weed/parser/auxiliary/eps.hpp
2011-11-13 17:54:38 +09:00

49 lines
1.3 KiB
C++

#ifndef SPROUT_WEED_PARSER_AUXILIARY_EPS_HPP
#define SPROUT_WEED_PARSER_AUXILIARY_EPS_HPP
#include <cstddef>
#include <sprout/config.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:
typedef sprout::weed::unused type;
};
template<typename Context, typename Iterator>
struct result {
public:
typedef sprout::weed::parser_result<Iterator, typename attribute<Context, Iterator>::type> type;
};
public:
template<typename Context, typename Iterator>
SPROUT_CONSTEXPR typename result<Context, Iterator>::type operator()(
Iterator first,
Iterator last,
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