access access accessFirst appendBintable appendBintable appendBintableHeader appendImage appendImageHeader appendNullBintable appendNullImage assignBintableExt assignBintableExt assignImageExt filter find hduCount initBintableExt initImageExt initRecordExt MefFile operator[] primary primaryIndex readHduNames readHduNamesVersions select ~MefFile

access() [1/2] 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 to just handle metadata. Returns A reference to the HDU reader-writer. The default handler is Hdu, in which case the returned HDU can still be cast to another handler, e.g.: const auto &ext = f.access<>(1); ext.as<ImageHdu>().readRaster<float>(); See also operator[]