status.hpp

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#pragma once
 
#include <libusb.h>
#include <system_error>
 
namespace co_usb::transfer
{
 
enum class status
{
    completed = LIBUSB_TRANSFER_COMPLETED,
 
    error = LIBUSB_TRANSFER_ERROR,
 
    timed_out = LIBUSB_TRANSFER_TIMED_OUT,
 
    cancelled = LIBUSB_TRANSFER_CANCELLED,
 
    stall = LIBUSB_TRANSFER_STALL,
 
    no_device = LIBUSB_TRANSFER_NO_DEVICE,
 
    overflow = LIBUSB_TRANSFER_OVERFLOW,
};
 
struct transfer_status_category_t : public std::error_category
{
    const char *name () const noexcept override
    {
        return "co_usb transfer status";
    }
 
    std::string message (int v) const override
    {
        switch (static_cast<status>(v))
        {
            using enum status;
        case completed: return "completed";
        case error: return "error";
        case cancelled: return "cancelled";
        case stall: return "device stalled";
        case no_device: return "no such device";
        case overflow: return "data overflow";
        default: return "unknown";
        }
    }
};
 
inline const std::error_category &transfer_status_category ()
{
    static transfer_status_category_t instance;
    return instance;
}
 
inline std::error_code make_transfer_status (status e) noexcept
{
    return {static_cast<int>(e), transfer_status_category()};
}
 
inline std::error_code make_transfer_status (libusb_transfer_status e) noexcept
{
    return {static_cast<int>(e), transfer_status_category()};
}
 
} // namespace co_usb::transfer
 
namespace std
{
 
template <> struct is_error_code_enum<co_usb::transfer::status> : ::std::true_type
{
};
 
} // namespace std