@Override
    public <S> void setSack(final Supplier<S> initialValue, final UnaryOperator<S> splitOperator, final BinaryOperator<S> mergeOperator) {
        this.sideEffects.setSack(initialValue, splitOperator, mergeOperator);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/computer/traversal/MemoryTraversalSideEffects.java