access access append append_bintable append_bintable append_bintable_header append_image append_image_header append_null_bintable append_null_image appendBintable appendBintableHeader appendImage appendImageHeader appendNullBintable appendNullImage close filter find hdu_count hduCount MefFile operator[] primary read_hdu_names read_hdu_names_versions readHduNames readHduNamesVersions remove strategy strategy strategy ~MefFile

access() [2/2] const T & access ( long  index ) Access the HDU at given 0-based index. Template Parameters T The type of HDU or header or data unit handler, i.e. ImageHdu, ImageRaster, BintableHdu, BintableColumns, Hdu or Header. Returns A reference to the HDU reader-writer. Backward indexing is enabled. The default handler is Hdu, in which case the returned HDU can still be cast to another handler with Hdu::as(), e.g.: const auto &ext = f.access<>(-1); // Same as f[-1] auto raster = ext.as<ImageHdu>().raster().read<float>(); // Shortcut auto raster = f.access<ImageRaster>(-1).read<float>(); See also operator[]