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Editing: filter.hpp

#ifndef PYTHONIC_INCLUDE_BUILTIN_FILTER_HPP
#define PYTHONIC_INCLUDE_BUILTIN_FILTER_HPP

#include "pythonic/include/utils/iterator.hpp"
#include "pythonic/include/itertools/common.hpp"
#include "pythonic/include/utils/functor.hpp"

PYTHONIC_NS_BEGIN

namespace builtins
{

namespace details
  {

template <typename Operator, typename List0>
    struct filter_iterator
        : std::iterator<std::forward_iterator_tag, typename List0::value_type> {
      using sequence_type = typename std::remove_cv<
          typename std::remove_reference<List0>::type>::type;

Operator op;
      typename List0::iterator iter;
      // FIXME : iter_end should be const because filter should be evaluate
      // only once. Some tests doesn't work with it for now because of
      // uncorrect itertools.product implementation
      typename List0::iterator iter_end;

bool test_filter(std::true_type);
      bool test_filter(std::false_type);

filter_iterator() = default;
      filter_iterator(Operator _op, List0 &_seq);
      filter_iterator(itertools::npos, Operator _op, List0 &_seq);

typename List0::value_type operator*() const;

filter_iterator &operator++();
      void next_value();

bool operator==(filter_iterator const &other) const;
      bool operator!=(filter_iterator const &other) const;
      bool operator<(filter_iterator const &other) const;
    };

// Inherit from iterator_reminder to keep a reference on the iterator
    // && avoid a dangling reference
    // FIXME: It would be better to have a copy only if needed but Pythran
    // typing is ! good enough for this as arguments have
    // remove_cv/remove_ref
    template <typename Operator, typename List0>
    struct filter : utils::iterator_reminder<false, List0>,
                    filter_iterator<Operator, List0> {

using value_type = typename List0::value_type;
      using iterator = filter_iterator<Operator, List0>;

iterator end_iter;

filter() = default;
      filter(Operator _op, List0 const &_seq);

iterator &begin();
      iterator const &begin() const;
      iterator const &end() const;
    };
  }

template <typename Operator, typename List0>
  details::filter<typename std::remove_cv<
                      typename std::remove_reference<Operator>::type>::type,
                  typename std::remove_cv<
                      typename std::remove_reference<List0>::type>::type>
  filter(Operator &&_op, List0 &&_seq);

DEFINE_FUNCTOR(pythonic::builtins, filter);
}
PYTHONIC_NS_END

#endif

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