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use super::Frequency;
impl Frequency {
/// Converts the frequency to a `chrono::Duration`.
///
/// # Examples
/// ```rust
/// use parse_frequency::Frequency;
///
/// let freq = Frequency::from_ghz(1);
/// let duration = freq.as_chrono_duration();
/// assert_eq!(duration.num_nanoseconds(), Some(1));
///
/// let freq = Frequency::from_mhz(1);
/// let duration = freq.as_chrono_duration();
/// assert_eq!(duration.num_nanoseconds(), Some(1_000));
/// ````
#[must_use]
#[allow(clippy::cast_possible_truncation, clippy::cast_possible_wrap)]
pub fn as_chrono_duration(&self) -> chrono::Duration {
if self.0 == 0 {
return chrono::Duration::zero();
}
let nanoseconds_per_second: u64 = 1_000_000_000;
if nanoseconds_per_second >= self.0 {
chrono::Duration::nanoseconds((nanoseconds_per_second / self.0) as i64)
} else {
// If frequency is higher than 1 GHz, the period is less than 1 ns.
// Calculate in picoseconds and then convert to nanoseconds.
let picoseconds_per_second: u128 = 1_000_000_000_000;
let frequency: u128 = u128::from(self.0);
let period_in_picoseconds = picoseconds_per_second / frequency;
let period_in_nanoseconds = period_in_picoseconds / 1_000;
chrono::Duration::nanoseconds(period_in_nanoseconds as i64)
}
}
}