Enum OverlayRefusal 

#[non_exhaustive]
pub enum OverlayRefusal {
    Invalid(OverlayError),
    BudgetExceeded {
        needed: usize,
        budget: usize,
    },
}

Why a budgeted overlay gave no result.

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.

Invalid(OverlayError)

An operand failed the overlay’s checks, as crate::overlay_with and crate::union_soup_with refuse it.

BudgetExceeded

The subdivision would hold more than the memory budget: refused before allocating past it. needed is what had been charged when the budget was passed, a lower bound on what the operation needs; budget is the caller’s.

Fields

needed: usize

Bytes charged when the budget was passed.

budget: usize

The caller’s memory budget in bytes.

Trait Implementations

impl Clone for OverlayRefusal

fn clone(&self) -> OverlayRefusal

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OverlayRefusal

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

Formats the value using the given formatter.

impl Display for OverlayRefusal

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

Formats the value using the given formatter.

impl Eq for OverlayRefusal

impl Error for OverlayRefusal

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 From<OverlayError> for OverlayRefusal

fn from(error: OverlayError) -> Self

Converts to this type from the input type.

impl PartialEq for OverlayRefusal

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OverlayRefusal