      return 0;
#endif
    }

    inline FILE* _stderr(const bool throw_exception) {
#ifndef cimg_use_r
      cimg::unused(throw_exception);
      return stderr;
#else
      if (throw_exception) {
        cimg::exception_mode(0);
        throw CImgIOException("cimg::stderr(): Reference to 'stderr' stream not allowed in R mode "
                              "('cimg_use_r' is defined).");
Unknown