cartesian_product.hpp

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//
// Created by yonggyulee on 2024/01/27.
//
 
#ifndef VCCC_RANGES_VIEWS_CARTESIAN_PRODUCT_HPP
#define VCCC_RANGES_VIEWS_CARTESIAN_PRODUCT_HPP
 
#include <tuple>
#include <type_traits>
 
#include "vccc/__core/inline_or_static.hpp"
#include "vccc/__ranges/viewable_range.hpp"
#include "vccc/__ranges/views/all.hpp"
#include "vccc/__ranges/views/cartesian_product_view.hpp"
#include "vccc/__ranges/views/single.hpp"
 
#include "vccc/__type_traits/conjunction.hpp"
 
namespace vccc {
namespace ranges {
namespace views {
namespace detail {
 
struct cartesian_product_niebloid {
  constexpr auto operator()() const {
    return views::single(std::tuple<>());
  }
 
  template<typename... Rs, std::enable_if_t<conjunction<
      viewable_range<Rs>...
  >::value, int> = 0>
  constexpr auto operator()(Rs&&... rs) const {
    return ranges::cartesian_product_view<all_t<Rs&&>...>(std::forward<Rs>(rs)...);
  }
};
 
} // namespace detail
 
VCCC_INLINE_OR_STATIC constexpr detail::cartesian_product_niebloid cartesian_product{};
 
 
} // namespace views
} // namespace ranges
} // namespace vccc
 
#endif // VCCC_RANGES_VIEWS_CARTESIAN_PRODUCT_HPP