hotplug_awaitable.hpp

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#pragma once
 
#include "boost/capy/concept/io_awaitable.hpp"
#include "boost/capy/continuation.hpp"
#include "boost/capy/ex/io_env.hpp"
#include "co_usb/device_ref.hpp"
#include "co_usb/error.hpp"
#include <boost/capy/io_result.hpp>
#include <co_usb/hotplug/hotplug.hpp>
 
namespace co_usb
{
 
struct hotplug_awaitable
{
    hotplug_awaitable(libusb_context *ctx, int events, int flags, int vid, int pid, int dev_class);
 
    bool await_ready() noexcept;
 
    std::coroutine_handle<> await_suspend(std::coroutine_handle<> h,
                                          boost::capy::io_env const *env);
 
    boost::capy::io_result<hotplug_event, device_ref> await_resume();
 
  private:
    libusb_context *m_ctx;
    int m_events;
    int m_flags;
    int m_vid;
    int m_pid;
    int m_dev_class;
 
    libusb_hotplug_callback_handle m_handle;
 
    usb_error m_error;
    struct cb_data
    {
        boost::capy::io_env const *io_env = nullptr;
        boost::capy::continuation cont;
        hotplug_event event;
        device_ref dev;
    } m_data;
};
 
static_assert(boost::capy::IoAwaitable<hotplug_awaitable>, "Not an IoAwaitable");
 
} // namespace co_usb