#ifndef PYTHONIC_INCLUDE_BUILTIN_SET_UNION_HPP
#define PYTHONIC_INCLUDE_BUILTIN_SET_UNION_HPP

#include "pythonic/include/types/set.hpp"
#include "pythonic/include/utils/functor.hpp"

PYTHONIC_NS_BEGIN

namespace builtins
{

  namespace set
  {

    template <typename T, typename... Types>
    typename __combined<types::set<T>, Types...>::type
    union_(types::set<T> const &set, Types const &... others);

    template <typename... Types>
    typename __combined<types::empty_set, Types...>::type
    union_(types::empty_set const &init, Types const &... others);

    template <typename T>
    types::set<T> union_(types::set<T> const &set);

    template <typename T>
    typename __combined<types::empty_set, T>::type union_(T const &set);

    types::empty_set union_(types::empty_set const &init);

    DEFINE_FUNCTOR(pythonic::builtins::set, union_);
  }
}
PYTHONIC_NS_END
#endif