Struct rand_core::Error

[+] Show declaration

pub struct Error {
    pub kind: ErrorKind,
    pub msg: &'static str,
    // some fields omitted
}

[−] Expand description

Error type of random number generators

This is a relatively simple error type, designed for compatibility with and without the Rust std library. It embeds a "kind" code, a message (static string only), and an optional chained cause (std only). The kind and msg fields can be accessed directly; cause can be accessed via std::error::Error::cause or Error::take_cause. Construction can only be done via Error::new or Error::with_cause.

Fields

kind: ErrorKind

[−] Expand description

The error kind

msg: &'static str

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The error message

Methods

impl Error

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pub fn new(kind: ErrorKind, msg: &'static str) -> Self

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Create a new instance, with specified kind and a message.

pub fn with_cause<E>(kind: ErrorKind, msg: &'static str, cause: E) -> Self where     E: Into<Box<stdError + Send + Sync>>,

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Create a new instance, with specified kind, message, and a chained cause.

Note: stdError is an alias for std::error::Error.

If not targetting std (i.e. no_std), this function is replaced by another with the same prototype, except that there are no bounds on the type E (because both Box and stdError are unavailable), and the cause is ignored.

pub fn take_cause(&mut self) -> Option<Box<stdError + Send + Sync>>

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Take the cause, if any. This allows the embedded cause to be extracted. This uses Option::take, leaving self with no cause.

Trait Implementations

impl Debug for Error

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

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Formats the value using the given formatter.

impl Display for Error

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

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Formats the value using the given formatter.

impl stdError for Error

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fn description(&self) -> &str

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This method is soft-deprecated.

fn cause(&self) -> Option<&stdError>

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Deprecating in 1.33.0

: replaced by Error::source, which can support downcasting

The lower-level cause of this error, if any.

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

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The lower-level source of this error, if any.

impl From<Error> for Error

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fn from(error: Error) -> Self

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Performs the conversion.