ZED_TYPE_ID(void_);

void *foo(int par1, void *par2);

void_ *foo_wrapper(int par1, void_ *par2)
{
    return (void_ *) foo(par1, par2);
}
...
BOOST_PYTHON_MODULE(bar)
{
    def("foo", &amp;foo_wrapper);
}</pre>

    <hr>
    <h2><a name="custom_string"></a>How can I automatically
    convert my custom string type to and from a Python string?</h2>
    <font size="-1"><i>Ralf W. Grosse-Kunstleve provides these
    notes:</i></font><p>
    Below is a small, self-contained demo extension module that shows
    