visible?

/*
 *  call-seq:
 *     WIN32OLE_VARIABLE#visible?
 * 
 *  Returns true if the variable is public.
 *
 *     tobj = WIN32OLE_TYPE.new('Microsoft Excel 9.0 Object Library', 'XlSheetType')
 *     variables = tobj.variables
 *     variables.each do |variable|
 *       puts "#{variable.name} #{variable.visible?}"
 *     end
 *
 *     The result of above script is following:
 *       xlChart true
 *       xlDialogSheet true
 *       xlExcel4IntlMacroSheet true
 *       xlExcel4MacroSheet true
 *       xlWorksheet true
 *       
 */
static VALUE
folevariable_visible(self)
    VALUE self;
{
    struct olevariabledata *pvar;
    Data_Get_Struct(self, struct olevariabledata, pvar);
    return ole_variable_visible(pvar->pTypeInfo, pvar->index);
}