Struct rand::Error

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pub struct Error { /* private fields */ }

Expand description

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§

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impl Error

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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.

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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.

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pub fn new<E>(err: E) -> Error
where E: Into<Box<dyn Error + Send + Sync>>,

Construct from any type supporting std::error::Error

Available only when configured with std.

See also From<NonZeroU32>, which is available with and without std.

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pub fn inner(&self) -> &(dyn Error + Send + Sync + 'static)

Reference the inner error (std only)

When configured with std, this is a trivial operation and never panics. Without std, this method is simply unavailable.

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pub fn take_inner(self) -> Box<dyn Error + Send + Sync>

Unwrap the inner error (std only)

When configured with std, this is a trivial operation and never panics. Without std, this method is simply unavailable.

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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.

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pub fn code(&self) -> Option<NonZeroU32>

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.