resource.hpp

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#pragma once
 
#include "co_usb/transfer/detail/transfer_sequence.hpp"
#include <libusb.h>
#include <memory>
 
namespace co_usb::transfer
{
 
struct resource
{
    explicit resource (int iso_packets = 0)
        : m_utfer(libusb_alloc_transfer(iso_packets), libusb_free_transfer)
    {
        if (!m_utfer)
        {
            throw std::bad_alloc{};
        }
    }
 
    auto get () const noexcept -> libusb_transfer *
    {
        return m_utfer.get();
    }
 
  private:
    using deleter_t = std::decay_t<decltype(libusb_free_transfer)>;
    std::unique_ptr<libusb_transfer, deleter_t> m_utfer{nullptr, libusb_free_transfer};
};
 
static_assert(detail::TransferResource<resource>, "Not a proper transfer resource");
 
} // namespace co_usb::transfer