TYPEMAP
CpuNumFromRef_t INT_REF_OBJECT
INPUT
INT_REF_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;
 }