adjacent_transform.h

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#pragma once
 
#include "di/container/view/adjacent_transform_view.h"
#include "di/container/view/empty.h"
#include "di/container/view/zip_transform_view.h"
#include "di/function/curry_back.h"
#include "di/function/pipeline.h"
#include "di/function/tag_invoke.h"
 
namespace di::container::view {
namespace detail {
    template<size_t N>
    struct AdjacentTransformFunction {
        template<concepts::ViewableContainer Con, typename F>
        constexpr auto operator()(Con&& container, F&& function) const -> concepts::View auto {
            if constexpr (N == 0) {
                return zip_transform(util::forward<F>(function));
            } else {
                return AdjacentTransformView<meta::AsView<Con>, meta::Decay<F>, N>(util::forward<Con>(container),
                                                                                   util::forward<F>(function));
            }
        }
    };
}
 
template<size_t N>
constexpr inline auto adjacent_transform = function::curry_back(detail::AdjacentTransformFunction<N> {}, meta::c_<2ZU>);
}
 
namespace di {
using view::adjacent_transform;
}