GammaLib

If the following code is called with a reference to a column that actually exists already in the table, the column will be destroyed, leading specifically to a

libc++abi.dylib: Pure virtual function called!

exception in Python (this is specifically a Python problem which handles pointers to objects):

GFitsTableCol* GFitsTable::set(const int& colnum, const GFitsTableCol& column)
{
    // Free existing column
    if (m_columns[colnum] != NULL) delete m_columns[colnum];

    // Clone column
    m_columns[colnum] = column.clone();

    // Return pointer to column
    return m_columns[colnum];
}

This can be prevented by the following code

GFitsTableCol* GFitsTable::set(const int& colnum, const GFitsTableCol& column)
{
    // Free existing column only if it differs from current column. This
    // prevents deallocating the instance that is passed as argument which
    // would be
    if ((m_columns[colnum] != NULL) && (m_columns[colnum] != &column)) {
        delete m_columns[colnum];
    }

    // Clone column
    m_columns[colnum] = column.clone();

    // Return pointer to column
    return m_columns[colnum];
}

All GammaLib methods should be scanned for this potential problem and corrected.