Enum LayerSelectionError 

pub enum LayerSelectionError {
    EmptyChain,
    TooFewLayersToCompact,
    CompactionIncludesWritableHead {
        requested: usize,
        sealed: usize,
    },
    InvalidExportCount {
        requested: usize,
        available: usize,
    },
    IncompatibleExportBase,
}

Invalid physical-layer selection; no disk or archive mutation has occurred.

Variants

EmptyChain

A runtime or checkpoint chain must contain at least one physical layer.

TooFewLayersToCompact

Compaction must combine at least two sealed layers, including the base.

CompactionIncludesWritableHead

The explicit count includes the unsealed writable head or exceeds the chain.

Fields

requested: usize

Requested oldest-first count, including the base.

sealed: usize

Number of sealed layers, excluding the writable head.

InvalidExportCount

Explicit suffix selection must include at least one checkpoint layer.

Fields

requested: usize

Requested newest-first count.

available: usize

Total immutable layers in the checkpoint.

IncompatibleExportBase

The supplied baseline is not the exact physical prefix of the target.

Trait Implementations

impl Clone for LayerSelectionError

fn clone(&self) -> LayerSelectionError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayerSelectionError

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

Formats the value using the given formatter.

impl Display for LayerSelectionError

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

Formats the value using the given formatter.

impl Eq for LayerSelectionError

impl Error for LayerSelectionError

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 LayerSelectionError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LayerSelectionError