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error.rs
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error.rs
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// Copyright 2018 Developers of the Rand project.
// Copyright 2013-2015 The Rust Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use core::fmt;
/// An error that can occur when [`JitterRng::test_timer`] fails.
///
/// [`JitterRng::test_timer`]: crate::JitterRng::test_timer
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TimerError {
/// No timer available.
NoTimer,
/// Timer too coarse to use as an entropy source.
CoarseTimer,
/// Timer is not monotonically increasing.
NotMonotonic,
/// Variations of deltas of time too small.
TinyVariantions,
/// Too many stuck results (indicating no added entropy).
TooManyStuck,
#[doc(hidden)]
__Nonexhaustive,
}
impl TimerError {
fn description(&self) -> &'static str {
match *self {
TimerError::NoTimer => "no timer available",
TimerError::CoarseTimer => "coarse timer",
TimerError::NotMonotonic => "timer not monotonic",
TimerError::TinyVariantions => "time delta variations too small",
TimerError::TooManyStuck => "too many stuck results",
TimerError::__Nonexhaustive => unreachable!(),
}
}
}
impl fmt::Display for TimerError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.description())
}
}
#[cfg(feature = "std")]
impl ::std::error::Error for TimerError {
fn description(&self) -> &str {
self.description()
}
}