iota.h

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#pragma once
 
#include "di/container/view/iota_view.h"
#include "di/function/tag_invoke.h"
#include "di/util/declval.h"
#include "di/util/forward.h"
 
namespace di::container::view {
namespace detail {
    struct IotaFunction {
        template<typename T>
        constexpr auto operator()(T&& value) const -> meta::TagInvokeResult<IotaFunction, T> {
            return function::tag_invoke(*this, util::forward<T>(value));
        }
 
        template<typename T, typename Bound>
        constexpr auto operator()(T&& value, Bound&& bound) const -> meta::TagInvokeResult<IotaFunction, T, Bound> {
            return function::tag_invoke(*this, util::forward<T>(value), util::forward<Bound>(bound));
        }
 
        template<typename T>
        requires(requires { container::IotaView(util::declval<T>()); })
        constexpr auto operator()(T&& value) const {
            return container::IotaView(util::forward<T>(value));
        }
 
        template<typename T, typename Bound>
        requires(requires { container::IotaView(util::declval<T>(), util::declval<Bound>()); })
        constexpr auto operator()(T&& value, Bound&& bound) const {
            return container::IotaView(util::forward<T>(value), util::forward<Bound>(bound));
        }
    };
}
 
constexpr inline auto iota = detail::IotaFunction {};
}
 
namespace di {
using view::iota;
}