all.h

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#pragma once
 
#include "di/container/concepts/view.h"
#include "di/container/concepts/viewable_container.h"
#include "di/container/view/owning_view.h"
#include "di/container/view/ref_view.h"
#include "di/function/pipeline.h"
#include "di/meta/util.h"
#include "di/util/declval.h"
#include "di/util/forward.h"
 
namespace di::container::view {
namespace detail {
    template<typename Con>
    concept AllRefView = requires(Con&& container) { RefView { util::forward<Con>(container) }; };
 
    template<typename Con>
    concept AllOwningView = requires(Con&& container) { OwningView { util::forward<Con>(container) }; };
 
    struct AllFunction : function::pipeline::EnablePipeline {
        template<concepts::ViewableContainer Con>
        requires(concepts::View<meta::Decay<Con>> || AllRefView<Con> || AllOwningView<Con>)
        constexpr auto operator()(Con&& container) const {
            if constexpr (concepts::View<meta::Decay<Con>>) {
                return util::forward<Con>(container);
            } else if constexpr (AllRefView<Con>) {
                return RefView { util::forward<Con>(container) };
            } else {
                return OwningView { util::forward<Con>(container) };
            }
        }
    };
}
 
constexpr inline auto all = detail::AllFunction {};
}