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#ifndef PYTHONIC_NUMPY_NANSUM_HPP
#define PYTHONIC_NUMPY_NANSUM_HPP

#include "pythonic/include/numpy/nansum.hpp"

#include "pythonic/utils/functor.hpp"
#include "pythonic/types/ndarray.hpp"
#include "pythonic/numpy/isnan.hpp"

PYTHONIC_NS_BEGIN

namespace numpy
{
  template <class E, class F>
  void _nansum(E begin, E end, F &sum, utils::int_<1>)
  {
    for (; begin != end; ++begin) {
      auto curr = *begin;
      if (!functor::isnan()(curr))
        sum += curr;
    }
  }
  template <class E, class F, size_t N>
  void _nansum(E begin, E end, F &sum, utils::int_<N>)
  {
    for (; begin != end; ++begin)
      _nansum((*begin).begin(), (*begin).end(), sum, utils::int_<N - 1>());
  }

  template <class E>
  typename E::dtype nansum(E const &expr)
  {
    typename E::dtype s = 0;
    _nansum(expr.begin(), expr.end(), s, utils::int_<E::value>());
    return s;
  }
}
PYTHONIC_NS_END

#endif

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