Function libxlsxwriter_sys::worksheet_write_formula_num

pub unsafe extern "C" fn worksheet_write_formula_num(
    worksheet: *mut lxw_worksheet, 
    row: lxw_row_t, 
    col: lxw_col_t, 
    formula: *const c_char, 
    format: *mut lxw_format, 
    result: f64
) -> lxw_error