message: Still using header guards
diff: #pragma once
  +#ifndef VSNRAY_CUDA_FILL_H
  +#define VSNRAY_CUDA_FILL_H 1
  +
  #include <cstddef>
  namespace visionaray
  @@ -14,3 +17,5 @@ void fill(void* ptr, size_t len, void* bytes, unsigned count);
  } // cuda
  } // visionaray
  +
  +#endif // VSNRAY_CUDA_FILL_H
  