has init initSeq initSeq read read readAllNames readBufferRowCount readColumnCount readIndex readIndices readInfo readInfo readName readRowCount readSegment readSegment readSegmentSeq readSegmentSeq readSegmentSeqTo readSegmentSeqTo readSegmentSeqTo readSegmentSeqTo readSegmentSeqTo readSegmentSeqTo readSegmentTo readSegmentTo readSegmentTo readSeq readSeq readSeqTo readSeqTo readSeqTo readSeqTo readSeqTo readSeqTo readTo readTo readTo remove remove removeSeq removeSeq rename rename write writeSegment writeSegmentSeq writeSegmentSeq writeSeq writeSeq

readTo() [3/3] template<typename T > void Euclid::Fits::BintableColumns::readTo ( long  index, Column< T > &  column  ) const Read the column with given index into an existing Column. Parameters index The index of the column to be read column The Column object to which data should be written There are several ways to read a column, which can be specified either by its name or 0-based index. The simplest way is to read the whole column as a new VecColumn with methods read(). In this case, the value type is given as the template parameter. In order to store the column data in an existing Column (e.g. PtrColumn), similar methods readTo() should be used. In this case, the value type is deduced and should not be specified. Example usages: // Create a new Column auto fromName = columns.read<float>("RA"); auto fromIndex = columns.read<float>(1); // Concatenate two columns into an existing Column long rowCount = readRowCount(); std::vector<float> values(rowCount * 2); PtrColumn<float> ra({ "RA", "deg", 1 }, rowCount, &values[0]); PtrColumn<float> dec({ "DEC", "deg", 1 }, rowCount, &values[rowCount]); columns.readTo("RA", ra); columns.readTo("DEC", dec); Warning Methods readTo() do not allocate memory: the user must ensure that enough space has been allocated previously.