Enum Error 

#[non_exhaustive]
pub enum Error {
    CapacityOverflow,
    OverGrow {
        to_grow: usize,
        available: usize,
    },
    AllocError {
        layout: Layout,
        /* private fields */
    },
    System(Error),
}

Errors that can occur during memory operations.

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.

CapacityOverflow

Error due to the computed capacity exceeding the maximum (usually isize::MAX bytes).

Examples

grow more than isize::MAX bytes:

let mut mem = Alloc::new(Global);
assert!(matches!(mem.grow_filled(usize::MAX, 0u64), Err(Error::CapacityOverflow)));

OverGrow

Cannot grow because the requested size exceeds available capacity.

Fields

to_grow: usize

Number of elements requested.

available: usize

Number of elements available.

AllocError

The memory allocator returned an error

Fields

layout: Layout

The layout of allocation request that failed

System(Error)

An I/O or system-level error.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.