TYPEMAP
boolean                 T_IV
st_token*               O_OBJECT
st_token_list*          O_OBJECT

INPUT
O_OBJECT
    if( sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG) )
            $var = INT2PTR ($type, SvIV (SvRV ($arg)));
    else{
            warn( \"${Package}::$func_name() -- $var is not a blessed SV reference\" );
            XSRETURN_UNDEF;
    }

OUTPUT

# The Perl object is blessed into 'CLASS', which should be a
# char* having the name of the package for the blessing.
O_OBJECT
        sv_setref_pv( $arg, (char*)CLASS, (void*)$var );