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

readTo() [2/2] void readTo ( ColumnKey  key, TColumn &  column  ) const Read the column with given name or index into an existing Column. Parameters key The name or 0-based index of the column to be read column The Column object to which data should be written (column.info().name is not used by the method and can be different from the name parameter) key The name or 0-based index of the column to be read 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.