.. _program_listing_file_include_libcaercpp_devices_usb.hpp:

Program Listing for File usb.hpp
================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_libcaercpp_devices_usb.hpp>` (``include/libcaercpp/devices/usb.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef LIBCAER_DEVICES_USB_HPP_
   #define LIBCAER_DEVICES_USB_HPP_
   
   #include "../../libcaer/devices/usb.h"
   
   #include "device.hpp"
   
   namespace libcaer {
   namespace devices {
   
   class usb : public device {
   protected:
       usb(uint16_t deviceID, uint16_t deviceType) : usb(deviceID, deviceType, 0, 0, "") {
       }
   
       usb(uint16_t deviceID, uint16_t deviceType, uint8_t busNumberRestrict, uint8_t devAddressRestrict,
           const std::string &serialNumberRestrict) {
           caerDeviceHandle h = caerDeviceOpen(deviceID, deviceType, busNumberRestrict, devAddressRestrict,
               (serialNumberRestrict.empty()) ? (nullptr) : (serialNumberRestrict.c_str()));
   
           // Handle constructor failure.
           if (h == nullptr) {
               std::string exc = "Failed to open USB device, id=" + std::to_string(deviceID) + ", type="
                                 + std::to_string(deviceType) + ", busNumber=" + std::to_string(busNumberRestrict)
                                 + ", devAddress=" + std::to_string(devAddressRestrict)
                                 + ", serialNumber=" + serialNumberRestrict + ".";
               throw std::runtime_error(exc);
           }
   
           // Use stateless lambda for shared_ptr custom deleter.
           auto deleteDeviceHandle = [](caerDeviceHandle cdh) {
               // Run destructor, free all memory.
               // Never fails in current implementation.
               caerDeviceClose(&cdh);
           };
   
           handle = std::shared_ptr<struct caer_device_handle>(h, deleteDeviceHandle);
       }
   };
   } // namespace devices
   } // namespace libcaer
   
   #endif /* LIBCAER_DEVICES_USB_HPP_ */