flip.hpp

#ifndef MITAMA_RANGE_VIEW_FLIP_HPP
#define MITAMA_RANGE_VIEW_FLIP_HPP
#include <range/v3/all.hpp>
#include <utility>
#include <type_traits>
#include <tuple>

namespace mitama::views {
    inline constexpr auto flip = ranges::views::transform([](auto&& t){
        static_assert(std::tuple_size_v<std::decay_t<decltype(t)>> >= 2);

        if constexpr (std::tuple_size_v<std::decay_t<decltype(t)>> == 2) {
            return std::forward_as_tuple(std::get<1>(t), std::get<0>(t));
        }
        else {
            static_assert([]{ return false; }());
        }
    });
}
#endif