message: allow ospInit() to use 'nullptr' as default arguments
diff: @@ -139,7 +139,8 @@ extern "C" {
  equivalent to doing ospNewDevice() followed by ospSetCurrentDevice()
  returns OSPError value to report any errors during initialization */
  - OSPRAY_INTERFACE OSPError ospInit(int *argc, const char **argv);
  + OSPRAY_INTERFACE OSPError ospInit(int *argc OSP_DEFAULT_VAL(NULL),
  + const char **argv OSP_DEFAULT_VAL(NULL));
  // returns the OSPRay Version in use by the device
  OSPRAY_INTERFACE int64_t ospDeviceGetProperty(OSPDevice, OSPDeviceProperty);
  