Struct OverflowError 

pub struct OverflowError {
    what: &'static str,
    value: Option<usize>,
    type_name: &'static str,
}

An arithmetic overflow.

Returned by the try_ alternatives to the functions that panic on overflow, for instance OffsetBuffer::try_from_lengths.

// 32 bit offsets cannot describe more than 2 GiB of data:
let err = OffsetBuffer::<i32>::try_from_lengths([u32::MAX as usize]).unwrap_err();
assert_eq!(err.to_string(), "offset overflow: 4294967295 does not fit in i32");

// 64 bit offsets can:
assert!(OffsetBuffer::<i64>::try_from_lengths([u32::MAX as usize]).is_ok());

Fields

what: &'static str

value: Option<usize>

type_name: &'static str

Implementations

impl OverflowError

pub fn new<T>(what: &'static str) -> Self

what names what overflowed, for instance "offset", and T is the type it did not fit in, for instance i32.

pub const fn with_value(self, value: usize) -> Self

The value that did not fit.

pub const fn what(&self) -> &'static str

What overflowed, for instance "offset".

pub const fn value(&self) -> Option<usize>

The value that did not fit, if known.

pub const fn type_name(&self) -> &'static str

The name of the type that the value did not fit in, for instance "i32".

Trait Implementations

impl Clone for OverflowError

fn clone(&self) -> OverflowError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OverflowError

impl Debug for OverflowError

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

Formats the value using the given formatter.

impl Display for OverflowError

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

Formats the value using the given formatter.

impl Eq for OverflowError

impl Error for OverflowError

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 OverflowError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for OverflowError