transfer_sequence.hpp

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#pragma once
 
#include <libusb.h>
#include <ranges>
#include <type_traits>
 
namespace co_usb::transfer::detail
{
 
template <typename Ty>
concept TransferResource =
    std::same_as<std::remove_cvref_t<Ty>, libusb_transfer *> || requires(Ty ty) {
        { ty.get() } -> std::same_as<libusb_transfer *>;
    };
 
template <TransferResource Ty>
constexpr inline auto transfer_of (Ty const &tfer_res) -> libusb_transfer *
{
    if constexpr (std::same_as<std::remove_cvref_t<Ty>, libusb_transfer *>)
    {
        return tfer_res;
    }
    else
    {
        return tfer_res.get();
    }
};
 
template <typename Ty>
concept TransferSequence =
    TransferResource<Ty> ||
    (std::ranges::bidirectional_range<Ty> && TransferResource<std::ranges::range_value_t<Ty>>);
 
} // namespace co_usb::transfer::detail