Method delUse

chapter21/src/main/java/com/seaofnodes/simple/node/Node.java:234–237

( Node use )

    // Return true if the output list is empty afterward.
    // Error is 'use' does not exist; ok for 'use' to be null.
    protected boolean delUse( Node use ) {
        _outputs.del(_outputs.find(use));
        return _outputs.isEmpty();
    }

    // Shortcut for "popping" until n nodes.  A "pop" is basically a
    // setDef(last,null) followed by lowering the nIns() count.