Build 3.0.0.86 of xlsgen adds a converter for sheet columns.
Cells are identified by (row, column) pairs. For some users however, the typical Excel notation such as B5 or C2 feels more natural, so xlsgen offers a mechanism for converting back and forth cell coordinates.
For instance, in order to know that B is the second column (trivial), and that AA is the 27-th column (a little less trivial), there is a converter available at the worksheet level :
(C++ code)
int column = worksheet->CellColumnFromAx[L"AA5"]; // returns 27 because AA is the 27-th column