Struct rand::Error

pub struct Error { /* private fields */ }

Error type of random number generators

In order to be compatible with std and no_std, this type has two possible implementations: with std a boxed Error trait object is stored, while with no_std we merely store an error code.

Implementations

impl Error

pub const CUSTOM_START: u32 = 3_221_225_472u32

Codes at or above this point can be used by users to define their own custom errors.

This has a fixed value of (1 << 31) + (1 << 30) = 0xC000_0000, therefore the number of values available for custom codes is 1 << 30.

This is identical to getrandom::Error::CUSTOM_START.

pub const INTERNAL_START: u32 = 2_147_483_648u32

Codes below this point represent OS Errors (i.e. positive i32 values). Codes at or above this point, but below Error::CUSTOM_START are reserved for use by the rand and getrandom crates.

This is identical to getrandom::Error::INTERNAL_START.

pub fn raw_os_error(&self) -> Option<i32>

Extract the raw OS error code (if this error came from the OS)

This method is identical to std::io::Error::raw_os_error(), except that it works in no_std contexts. If this method returns None, the error value can still be formatted via the Display implementation.

pub fn code(&self) -> Option<NonZero<u32>>

Retrieve the error code, if any.

If this Error was constructed via From<NonZeroU32>, then this method will return this NonZeroU32 code (for no_std this is always the case). Otherwise, this method will return None.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl From<Error> for Error

fn from(error: Error) -> Error

Converts to this type from the input type.

impl From<NonZero<u32>> for Error

fn from(code: NonZero<u32>) -> Error

Converts to this type from the input type.