Hello,

In the html doc, section 5.15.2

I think that :

{
    parser reader;
    ex e = reader("2*x+sin(y)");
    symtab table = reader.get_syms();
    symbol x = reader["x"];
    symbol y = reader["y"];
}

the two last lines should be

    symbol x = table["x"];
    symbol y = table["y"];

Best regards

Jean-Michaël Celerier