TYPEMAP
VlThing_t *	ANY_OBJECT

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

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

