Enum FrontierError 

#[non_exhaustive]
pub enum FrontierError {
    BadShape {
        name: &'static str,
        node_count: u32,
        expected_words: usize,
        actual_words: usize,
    },
    PopcountOverflow {
        frontier_words: usize,
    },
    Allocation {
        name: &'static str,
        requested_words: usize,
        source: String,
    },
    QueueCapacity {
        node_count: u32,
        capacity: usize,
        required: u32,
    },
    QueueCountMismatch {
        node_count: u32,
        expected: u32,
        observed: u32,
    },
}

Error returned by packed-frontier helpers.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

BadShape

A frontier slice length does not match bitset_words(node_count).

Fields

name: &'static str

Human-readable slice role.

node_count: u32

Declared graph/node domain width.

expected_words: usize

Expected number of u32 words.

actual_words: usize

Actual number of u32 words.

PopcountOverflow

A popcount exceeded the compact u32 count representation.

Fields

frontier_words: usize

Number of frontier words counted before overflow.

Allocation

Caller-owned output frontier could not reserve enough storage.

Fields

name: &'static str

Human-readable output buffer role.

requested_words: usize

Requested u32 words.

source: String

Allocator detail.

QueueCapacity

A compact frontier queue cannot hold all active in-domain bits.

Fields

node_count: u32

Declared graph/node domain width.

capacity: usize

Queue slots available to the caller.

required: u32

In-domain active bits that must be materialized.

QueueCountMismatch

Caller-provided active-bit count disagrees with the frontier bits.

Fields

node_count: u32

Declared graph/node domain width.

expected: u32

Active in-domain bits promised by the caller.

observed: u32

Active in-domain bits observed before mismatch was proven.

Trait Implementations

impl Clone for FrontierError

fn clone(&self) -> FrontierError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FrontierError

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

Formats the value using the given formatter.

impl Display for FrontierError

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

Formats the value using the given formatter.

impl Eq for FrontierError

impl Error for FrontierError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for FrontierError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FrontierError