device_ref.hpp

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#pragma once
 
#include <libusb.h>
 
namespace co_usb
{
 
struct device_ref
{
    device_ref () noexcept : m_dev(nullptr)
    {
    }
 
    explicit device_ref (libusb_device *dev) noexcept : m_dev(dev)
    {
        libusb_ref_device(m_dev);
    }
 
    ~device_ref () noexcept
    {
        if (m_dev)
        {
            libusb_unref_device(m_dev);
        }
    }
 
    device_ref (device_ref const &other) noexcept : m_dev(other.m_dev)
    {
        if (m_dev)
            libusb_ref_device(m_dev);
    }
 
    device_ref &operator=(device_ref const &other) noexcept
    {
        m_dev = other.m_dev;
        if (m_dev)
            libusb_ref_device(m_dev);
        return *this;
    }
 
    auto valid () const noexcept -> bool
    {
        return m_dev != nullptr;
    }
 
    auto get () const noexcept -> libusb_device *
    {
        return m_dev;
    }
 
    auto release () noexcept -> libusb_device *
    {
        auto tmp = m_dev;
        m_dev = nullptr;
        return tmp;
    }
 
  private:
    libusb_device *m_dev;
};
 
} // namespace co_usb