Struct Buffer 

pub struct Buffer<T> { /* private fields */ }

A bounded first-in, first-out connective.

Capacity and contents remain private; mutation is possible only through the checked FIFO operations.

Examples

use automation_structures::Buffer;

let mut buffer = Buffer::new(2);
assert_eq!(buffer.push("first"), Ok(()));
assert_eq!(buffer.push("second"), Ok(()));
assert_eq!(buffer.push("full"), Err("full"));
assert_eq!(buffer.pop(), Some("first"));

Implementations

impl<T> Buffer<T>

pub fn new(capacity: usize) -> Self

Construct an empty FIFO with a fixed capacity.

Examples found in repository

examples/catalog.rs (line 149)

fn main() -> Result<(), Box<dyn Error>> {
    // Primitives.
    let mut budget = Budget::new(8);
    assert!(budget.try_reserve(3));
    budget.commit_reservation(3)?;

    let mut hierarchy = QualityHierarchy::new(2, 2);
    hierarchy.set_node_properties(0, 2, 1)?;
    hierarchy.set_node_properties(1, 1, 2)?;
    hierarchy.add_child(0, 1)?;

    let mut registry = ResourceRegistry::new();
    registry.insert(1, 10);
    assert_eq!(registry.get(1), Some(10));

    let mut hard = CompetitiveSelectionHard::new(2)?;
    hard.update_score(0, 2)?;
    hard.update_score(1, 1)?;
    assert_eq!(hard.evaluate(), 0);

    let mut exclusive = CompetitiveSelectionHardExclusive::new(1, 2, 2)?;
    exclusive.update_score(0, 0, 2)?;
    exclusive.update_score(0, 1, 1)?;
    assert_eq!(exclusive.evaluate(0)?, 0);

    let mut soft = CompetitiveSelectionSoft::begin(vec![3, 1], 4, 3)?;
    assert_eq!(soft.assign_next()?, 0);

    let mut ranked = CompetitiveSelectionRanked::new(vec![2, 1], 1, 2)?;
    ranked.select();
    assert_eq!(ranked.is_selected(0), Some(true));

    let mut actuation = ActuationPass::new(vec![Some(7)]);
    actuation.actuate(0)?;
    actuation.finish()?;

    let mut propagation = PropagationPass::new(1, 2, vec![], vec![0])?;
    propagation.start_round()?;
    propagation.update_node(0)?;
    propagation.end_round()?;

    let mut convergence = ConvergenceGovernor::new(2, 6, 2, 10)?;
    assert_eq!(convergence.update(1)?, 1);

    let mut audit = AuditSink::new(1);
    assert!(audit.try_record(7));
    assert!(audit.validate());

    let mut backtracking = BacktrackingTraversal::new(2, 1, 0)?;
    backtracking.descend(1, 1)?;
    backtracking.visit()?;

    // Named compositions.
    let mut snapshot = AllocationSnapshot::new(3, 1);
    snapshot.accept(0, 3)?;

    let mut federated = FederatedBudget::new(4, 1);
    assert!(federated.try_delegate(0, 4));
    assert!(federated.try_allocate(0, 2));

    let mut bisection = Bisection::new(4, 2)?;
    bisection.converge();
    assert!(bisection.is_converged());

    let mut classes = EquivalenceClass::new(2, 1);
    assert!(classes.union(0, 1)?);

    let mut rate_limit = RateLimit::new(1, 1, 1)?;
    assert!(rate_limit.try_acquire());

    let mut reduction = Reduction::new(vec![2, 3])?;
    reduction.process_next()?;

    let mut graph = RelationshipGraph::new(2, 1);
    assert!(graph.add_edge(0, 1, 1)?);

    let mut sampler = Sampler::new(vec![1, 1], 1);
    sampler.sample(0)?;

    let mut select_then_actuate = SelectThenActuate::new(1, 2)?;
    select_then_actuate.update_score(0, 0, 1)?;
    assert_eq!(select_then_actuate.evaluate(0)?, 0);
    select_then_actuate.actuate(0)?;
    select_then_actuate.finish()?;

    let mut signal = Signal::new(0, 2, 1)?;
    assert!(signal.set_value(1)?);
    signal.notify(0)?;

    let mut traversal = TraversalEngine::new(1, 0, 2)?;
    traversal.visit(0)?;
    assert_eq!(traversal.accepted_cost(), 2);
    traversal.terminate()?;

    // Execution modalities.
    let mut sequential = Sequential::new(1, 2, 0)?;
    assert!(sequential.begin_step());
    assert!(sequential.complete_step(1));

    let mut fork_join = ForkJoin::new(1, 2, 0)?;
    assert!(fork_join.start_worker(0));
    assert!(fork_join.complete_worker(0, 1));
    assert!(fork_join.barrier());
    assert!(fork_join.produce_output());

    let mut step_graph = StepGraph::new(1, vec![])?;
    assert!(step_graph.start(0));
    assert!(step_graph.complete(0));

    let mut stream_graph = StreamGraph::new(3, 1, 1, 2)?;
    assert!(stream_graph.ingest(1));
    assert!(stream_graph.advance_first());
    assert_eq!(stream_graph.consume(), Some(1));

    // Connective roles.
    let mut cursor = Cursor::new(0);
    cursor.advance_to(1)?;

    let mut accumulator = Accumulator::new(vec![1]);
    assert_eq!(accumulator.advance(), Some(1));
    assert_eq!(accumulator.accumulated(0), Some(1));

    let mut marker = Marker::new(false);
    assert!(marker.set());

    let mut counter = Counter::new(0);
    assert!(counter.try_increment());

    let mut buffer = Buffer::new(1);
    assert_eq!(buffer.push(1), Ok(()));
    assert_eq!(buffer.pop(), Some(1));

    assert!(projection_consistent(true, true));
    assert!(strictly_before(0, 1));

    assert_debuggable!(
        budget,
        hierarchy,
        registry,
        hard,
        exclusive,
        soft,
        ranked,
        actuation,
        propagation,
        convergence,
        audit,
        backtracking,
        snapshot,
        federated,
        bisection,
        classes,
        rate_limit,
        reduction,
        graph,
        sampler,
        select_then_actuate,
        signal,
        traversal,
        sequential,
        fork_join,
        step_graph,
        stream_graph,
        cursor,
        accumulator,
        marker,
        counter,
        buffer,
    );

    println!("all public automation structures constructed and exercised");
    Ok(())
}

pub fn capacity(&self) -> usize

Fixed FIFO capacity.

pub fn len(&self) -> usize

Number of retained values.

pub fn is_empty(&self) -> bool

Whether no values are retained.

pub fn is_full(&self) -> bool

Whether the FIFO is at capacity.

pub fn push(&mut self, value: T) -> Result<(), T>

Push one value, returning it unchanged when the FIFO is full.

Errors

Returns the supplied value when the buffer is full.

Examples found in repository

examples/catalog.rs (line 150)

fn main() -> Result<(), Box<dyn Error>> {
    // Primitives.
    let mut budget = Budget::new(8);
    assert!(budget.try_reserve(3));
    budget.commit_reservation(3)?;

    let mut hierarchy = QualityHierarchy::new(2, 2);
    hierarchy.set_node_properties(0, 2, 1)?;
    hierarchy.set_node_properties(1, 1, 2)?;
    hierarchy.add_child(0, 1)?;

    let mut registry = ResourceRegistry::new();
    registry.insert(1, 10);
    assert_eq!(registry.get(1), Some(10));

    let mut hard = CompetitiveSelectionHard::new(2)?;
    hard.update_score(0, 2)?;
    hard.update_score(1, 1)?;
    assert_eq!(hard.evaluate(), 0);

    let mut exclusive = CompetitiveSelectionHardExclusive::new(1, 2, 2)?;
    exclusive.update_score(0, 0, 2)?;
    exclusive.update_score(0, 1, 1)?;
    assert_eq!(exclusive.evaluate(0)?, 0);

    let mut soft = CompetitiveSelectionSoft::begin(vec![3, 1], 4, 3)?;
    assert_eq!(soft.assign_next()?, 0);

    let mut ranked = CompetitiveSelectionRanked::new(vec![2, 1], 1, 2)?;
    ranked.select();
    assert_eq!(ranked.is_selected(0), Some(true));

    let mut actuation = ActuationPass::new(vec![Some(7)]);
    actuation.actuate(0)?;
    actuation.finish()?;

    let mut propagation = PropagationPass::new(1, 2, vec![], vec![0])?;
    propagation.start_round()?;
    propagation.update_node(0)?;
    propagation.end_round()?;

    let mut convergence = ConvergenceGovernor::new(2, 6, 2, 10)?;
    assert_eq!(convergence.update(1)?, 1);

    let mut audit = AuditSink::new(1);
    assert!(audit.try_record(7));
    assert!(audit.validate());

    let mut backtracking = BacktrackingTraversal::new(2, 1, 0)?;
    backtracking.descend(1, 1)?;
    backtracking.visit()?;

    // Named compositions.
    let mut snapshot = AllocationSnapshot::new(3, 1);
    snapshot.accept(0, 3)?;

    let mut federated = FederatedBudget::new(4, 1);
    assert!(federated.try_delegate(0, 4));
    assert!(federated.try_allocate(0, 2));

    let mut bisection = Bisection::new(4, 2)?;
    bisection.converge();
    assert!(bisection.is_converged());

    let mut classes = EquivalenceClass::new(2, 1);
    assert!(classes.union(0, 1)?);

    let mut rate_limit = RateLimit::new(1, 1, 1)?;
    assert!(rate_limit.try_acquire());

    let mut reduction = Reduction::new(vec![2, 3])?;
    reduction.process_next()?;

    let mut graph = RelationshipGraph::new(2, 1);
    assert!(graph.add_edge(0, 1, 1)?);

    let mut sampler = Sampler::new(vec![1, 1], 1);
    sampler.sample(0)?;

    let mut select_then_actuate = SelectThenActuate::new(1, 2)?;
    select_then_actuate.update_score(0, 0, 1)?;
    assert_eq!(select_then_actuate.evaluate(0)?, 0);
    select_then_actuate.actuate(0)?;
    select_then_actuate.finish()?;

    let mut signal = Signal::new(0, 2, 1)?;
    assert!(signal.set_value(1)?);
    signal.notify(0)?;

    let mut traversal = TraversalEngine::new(1, 0, 2)?;
    traversal.visit(0)?;
    assert_eq!(traversal.accepted_cost(), 2);
    traversal.terminate()?;

    // Execution modalities.
    let mut sequential = Sequential::new(1, 2, 0)?;
    assert!(sequential.begin_step());
    assert!(sequential.complete_step(1));

    let mut fork_join = ForkJoin::new(1, 2, 0)?;
    assert!(fork_join.start_worker(0));
    assert!(fork_join.complete_worker(0, 1));
    assert!(fork_join.barrier());
    assert!(fork_join.produce_output());

    let mut step_graph = StepGraph::new(1, vec![])?;
    assert!(step_graph.start(0));
    assert!(step_graph.complete(0));

    let mut stream_graph = StreamGraph::new(3, 1, 1, 2)?;
    assert!(stream_graph.ingest(1));
    assert!(stream_graph.advance_first());
    assert_eq!(stream_graph.consume(), Some(1));

    // Connective roles.
    let mut cursor = Cursor::new(0);
    cursor.advance_to(1)?;

    let mut accumulator = Accumulator::new(vec![1]);
    assert_eq!(accumulator.advance(), Some(1));
    assert_eq!(accumulator.accumulated(0), Some(1));

    let mut marker = Marker::new(false);
    assert!(marker.set());

    let mut counter = Counter::new(0);
    assert!(counter.try_increment());

    let mut buffer = Buffer::new(1);
    assert_eq!(buffer.push(1), Ok(()));
    assert_eq!(buffer.pop(), Some(1));

    assert!(projection_consistent(true, true));
    assert!(strictly_before(0, 1));

    assert_debuggable!(
        budget,
        hierarchy,
        registry,
        hard,
        exclusive,
        soft,
        ranked,
        actuation,
        propagation,
        convergence,
        audit,
        backtracking,
        snapshot,
        federated,
        bisection,
        classes,
        rate_limit,
        reduction,
        graph,
        sampler,
        select_then_actuate,
        signal,
        traversal,
        sequential,
        fork_join,
        step_graph,
        stream_graph,
        cursor,
        accumulator,
        marker,
        counter,
        buffer,
    );

    println!("all public automation structures constructed and exercised");
    Ok(())
}

pub fn pop(&mut self) -> Option<T>

Remove and return the oldest retained value.

Examples found in repository

examples/catalog.rs (line 151)

fn main() -> Result<(), Box<dyn Error>> {
    // Primitives.
    let mut budget = Budget::new(8);
    assert!(budget.try_reserve(3));
    budget.commit_reservation(3)?;

    let mut hierarchy = QualityHierarchy::new(2, 2);
    hierarchy.set_node_properties(0, 2, 1)?;
    hierarchy.set_node_properties(1, 1, 2)?;
    hierarchy.add_child(0, 1)?;

    let mut registry = ResourceRegistry::new();
    registry.insert(1, 10);
    assert_eq!(registry.get(1), Some(10));

    let mut hard = CompetitiveSelectionHard::new(2)?;
    hard.update_score(0, 2)?;
    hard.update_score(1, 1)?;
    assert_eq!(hard.evaluate(), 0);

    let mut exclusive = CompetitiveSelectionHardExclusive::new(1, 2, 2)?;
    exclusive.update_score(0, 0, 2)?;
    exclusive.update_score(0, 1, 1)?;
    assert_eq!(exclusive.evaluate(0)?, 0);

    let mut soft = CompetitiveSelectionSoft::begin(vec![3, 1], 4, 3)?;
    assert_eq!(soft.assign_next()?, 0);

    let mut ranked = CompetitiveSelectionRanked::new(vec![2, 1], 1, 2)?;
    ranked.select();
    assert_eq!(ranked.is_selected(0), Some(true));

    let mut actuation = ActuationPass::new(vec![Some(7)]);
    actuation.actuate(0)?;
    actuation.finish()?;

    let mut propagation = PropagationPass::new(1, 2, vec![], vec![0])?;
    propagation.start_round()?;
    propagation.update_node(0)?;
    propagation.end_round()?;

    let mut convergence = ConvergenceGovernor::new(2, 6, 2, 10)?;
    assert_eq!(convergence.update(1)?, 1);

    let mut audit = AuditSink::new(1);
    assert!(audit.try_record(7));
    assert!(audit.validate());

    let mut backtracking = BacktrackingTraversal::new(2, 1, 0)?;
    backtracking.descend(1, 1)?;
    backtracking.visit()?;

    // Named compositions.
    let mut snapshot = AllocationSnapshot::new(3, 1);
    snapshot.accept(0, 3)?;

    let mut federated = FederatedBudget::new(4, 1);
    assert!(federated.try_delegate(0, 4));
    assert!(federated.try_allocate(0, 2));

    let mut bisection = Bisection::new(4, 2)?;
    bisection.converge();
    assert!(bisection.is_converged());

    let mut classes = EquivalenceClass::new(2, 1);
    assert!(classes.union(0, 1)?);

    let mut rate_limit = RateLimit::new(1, 1, 1)?;
    assert!(rate_limit.try_acquire());

    let mut reduction = Reduction::new(vec![2, 3])?;
    reduction.process_next()?;

    let mut graph = RelationshipGraph::new(2, 1);
    assert!(graph.add_edge(0, 1, 1)?);

    let mut sampler = Sampler::new(vec![1, 1], 1);
    sampler.sample(0)?;

    let mut select_then_actuate = SelectThenActuate::new(1, 2)?;
    select_then_actuate.update_score(0, 0, 1)?;
    assert_eq!(select_then_actuate.evaluate(0)?, 0);
    select_then_actuate.actuate(0)?;
    select_then_actuate.finish()?;

    let mut signal = Signal::new(0, 2, 1)?;
    assert!(signal.set_value(1)?);
    signal.notify(0)?;

    let mut traversal = TraversalEngine::new(1, 0, 2)?;
    traversal.visit(0)?;
    assert_eq!(traversal.accepted_cost(), 2);
    traversal.terminate()?;

    // Execution modalities.
    let mut sequential = Sequential::new(1, 2, 0)?;
    assert!(sequential.begin_step());
    assert!(sequential.complete_step(1));

    let mut fork_join = ForkJoin::new(1, 2, 0)?;
    assert!(fork_join.start_worker(0));
    assert!(fork_join.complete_worker(0, 1));
    assert!(fork_join.barrier());
    assert!(fork_join.produce_output());

    let mut step_graph = StepGraph::new(1, vec![])?;
    assert!(step_graph.start(0));
    assert!(step_graph.complete(0));

    let mut stream_graph = StreamGraph::new(3, 1, 1, 2)?;
    assert!(stream_graph.ingest(1));
    assert!(stream_graph.advance_first());
    assert_eq!(stream_graph.consume(), Some(1));

    // Connective roles.
    let mut cursor = Cursor::new(0);
    cursor.advance_to(1)?;

    let mut accumulator = Accumulator::new(vec![1]);
    assert_eq!(accumulator.advance(), Some(1));
    assert_eq!(accumulator.accumulated(0), Some(1));

    let mut marker = Marker::new(false);
    assert!(marker.set());

    let mut counter = Counter::new(0);
    assert!(counter.try_increment());

    let mut buffer = Buffer::new(1);
    assert_eq!(buffer.push(1), Ok(()));
    assert_eq!(buffer.pop(), Some(1));

    assert!(projection_consistent(true, true));
    assert!(strictly_before(0, 1));

    assert_debuggable!(
        budget,
        hierarchy,
        registry,
        hard,
        exclusive,
        soft,
        ranked,
        actuation,
        propagation,
        convergence,
        audit,
        backtracking,
        snapshot,
        federated,
        bisection,
        classes,
        rate_limit,
        reduction,
        graph,
        sampler,
        select_then_actuate,
        signal,
        traversal,
        sequential,
        fork_join,
        step_graph,
        stream_graph,
        cursor,
        accumulator,
        marker,
        counter,
        buffer,
    );

    println!("all public automation structures constructed and exercised");
    Ok(())
}

impl<T: ValueEq + Copy> Buffer<T>

pub fn contains(&self, value: T) -> bool

Query retained membership using the shared equality adapter.

pub fn push_unique(&mut self, value: T) -> bool

Append a value only when it is absent and capacity remains.

pub fn remove(&mut self, value: T) -> bool

Remove one distinct retained value wherever it occurs.

impl<T> Buffer<T>

pub fn get(&self, index: usize) -> Option<&T>

Borrow a retained value by FIFO position.

pub fn as_slice(&self) -> &[T]

Borrow the retained FIFO contents.

pub fn iter(&self) -> Iter<'_, T>

Borrow the retained values in FIFO order.

Trait Implementations

impl<T> AsRef<[T]> for Buffer<T>

fn as_ref(&self) -> &[T]

Converts this type into a shared reference of the (usually inferred) input type.

impl<T: Clone> Clone for Buffer<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for Buffer<T>

fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for Buffer<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: Eq> Eq for Buffer<T>

impl<'a, T> IntoIterator for &'a Buffer<T>

type Item = &'a T

The type of the elements being iterated over.

type IntoIter = Iter<'a, T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<T> IntoIterator for Buffer<T>

type Item = T

The type of the elements being iterated over.

type IntoIter = IntoIter<T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<T: PartialEq> PartialEq for Buffer<T>

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.