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1e14d397db
Add functions `Duration::try_from_secs_{f32, f64}`
These functions allow constructing a Duration from a floating point value that could be out of range without panicking.
Tracking issue: #83400
1206 lines
41 KiB
Rust
1206 lines
41 KiB
Rust
#![stable(feature = "duration_core", since = "1.25.0")]
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//! Temporal quantification.
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//!
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//! Example:
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//!
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//! ```
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//! use std::time::Duration;
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//!
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//! let five_seconds = Duration::new(5, 0);
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//! // both declarations are equivalent
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//! assert_eq!(Duration::new(5, 0), Duration::from_secs(5));
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//! ```
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use crate::fmt;
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use crate::iter::Sum;
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use crate::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};
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const NANOS_PER_SEC: u32 = 1_000_000_000;
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const NANOS_PER_MILLI: u32 = 1_000_000;
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const NANOS_PER_MICRO: u32 = 1_000;
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const MILLIS_PER_SEC: u64 = 1_000;
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const MICROS_PER_SEC: u64 = 1_000_000;
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/// A `Duration` type to represent a span of time, typically used for system
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/// timeouts.
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///
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/// Each `Duration` is composed of a whole number of seconds and a fractional part
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/// represented in nanoseconds. If the underlying system does not support
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/// nanosecond-level precision, APIs binding a system timeout will typically round up
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/// the number of nanoseconds.
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///
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/// [`Duration`]s implement many common traits, including [`Add`], [`Sub`], and other
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/// [`ops`] traits. It implements [`Default`] by returning a zero-length `Duration`.
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///
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/// [`ops`]: crate::ops
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let five_seconds = Duration::new(5, 0);
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/// let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);
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///
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/// assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
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/// assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);
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///
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/// let ten_millis = Duration::from_millis(10);
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/// ```
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///
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/// # Formatting `Duration` values
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///
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/// `Duration` intentionally does not have a `Display` impl, as there are a
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/// variety of ways to format spans of time for human readability. `Duration`
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/// provides a `Debug` impl that shows the full precision of the value.
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///
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/// The `Debug` output uses the non-ASCII "µs" suffix for microseconds. If your
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/// program output may appear in contexts that cannot rely on full Unicode
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/// compatibility, you may wish to format `Duration` objects yourself or use a
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/// crate to do so.
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#[stable(feature = "duration", since = "1.3.0")]
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#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
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pub struct Duration {
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secs: u64,
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nanos: u32, // Always 0 <= nanos < NANOS_PER_SEC
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}
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impl Duration {
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/// The duration of one second.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_constants)]
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::SECOND, Duration::from_secs(1));
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/// ```
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#[unstable(feature = "duration_constants", issue = "57391")]
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pub const SECOND: Duration = Duration::from_secs(1);
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/// The duration of one millisecond.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_constants)]
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::MILLISECOND, Duration::from_millis(1));
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/// ```
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#[unstable(feature = "duration_constants", issue = "57391")]
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pub const MILLISECOND: Duration = Duration::from_millis(1);
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/// The duration of one microsecond.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_constants)]
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::MICROSECOND, Duration::from_micros(1));
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/// ```
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#[unstable(feature = "duration_constants", issue = "57391")]
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pub const MICROSECOND: Duration = Duration::from_micros(1);
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/// The duration of one nanosecond.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_constants)]
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::NANOSECOND, Duration::from_nanos(1));
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/// ```
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#[unstable(feature = "duration_constants", issue = "57391")]
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pub const NANOSECOND: Duration = Duration::from_nanos(1);
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/// A duration of zero time.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::ZERO;
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/// assert!(duration.is_zero());
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/// assert_eq!(duration.as_nanos(), 0);
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/// ```
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#[stable(feature = "duration_zero", since = "1.53.0")]
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pub const ZERO: Duration = Duration::from_nanos(0);
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/// The maximum duration.
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///
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/// May vary by platform as necessary. Must be able to contain the difference between
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/// two instances of [`Instant`] or two instances of [`SystemTime`].
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/// This constraint gives it a value of about 584,942,417,355 years in practice,
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/// which is currently used on all platforms.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::MAX, Duration::new(u64::MAX, 1_000_000_000 - 1));
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/// ```
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/// [`Instant`]: ../../std/time/struct.Instant.html
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/// [`SystemTime`]: ../../std/time/struct.SystemTime.html
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#[stable(feature = "duration_saturating_ops", since = "1.53.0")]
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pub const MAX: Duration = Duration::new(u64::MAX, NANOS_PER_SEC - 1);
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/// Creates a new `Duration` from the specified number of whole seconds and
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/// additional nanoseconds.
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///
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/// If the number of nanoseconds is greater than 1 billion (the number of
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/// nanoseconds in a second), then it will carry over into the seconds provided.
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///
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/// # Panics
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///
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/// This constructor will panic if the carry from the nanoseconds overflows
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/// the seconds counter.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let five_seconds = Duration::new(5, 0);
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/// ```
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#[stable(feature = "duration", since = "1.3.0")]
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#[inline]
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#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
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pub const fn new(secs: u64, nanos: u32) -> Duration {
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let secs = match secs.checked_add((nanos / NANOS_PER_SEC) as u64) {
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Some(secs) => secs,
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None => panic!("overflow in Duration::new"),
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};
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let nanos = nanos % NANOS_PER_SEC;
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Duration { secs, nanos }
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}
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/// Creates a new `Duration` from the specified number of whole seconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_secs(5);
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///
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/// assert_eq!(5, duration.as_secs());
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/// assert_eq!(0, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration", since = "1.3.0")]
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#[inline]
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#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
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pub const fn from_secs(secs: u64) -> Duration {
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Duration { secs, nanos: 0 }
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}
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/// Creates a new `Duration` from the specified number of milliseconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(2569);
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///
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/// assert_eq!(2, duration.as_secs());
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/// assert_eq!(569_000_000, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration", since = "1.3.0")]
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#[inline]
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#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
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pub const fn from_millis(millis: u64) -> Duration {
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Duration {
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secs: millis / MILLIS_PER_SEC,
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nanos: ((millis % MILLIS_PER_SEC) as u32) * NANOS_PER_MILLI,
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}
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}
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/// Creates a new `Duration` from the specified number of microseconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_micros(1_000_002);
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///
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/// assert_eq!(1, duration.as_secs());
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/// assert_eq!(2000, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration_from_micros", since = "1.27.0")]
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#[inline]
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#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
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pub const fn from_micros(micros: u64) -> Duration {
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Duration {
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secs: micros / MICROS_PER_SEC,
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nanos: ((micros % MICROS_PER_SEC) as u32) * NANOS_PER_MICRO,
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}
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}
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/// Creates a new `Duration` from the specified number of nanoseconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_nanos(1_000_000_123);
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///
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/// assert_eq!(1, duration.as_secs());
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/// assert_eq!(123, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration_extras", since = "1.27.0")]
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#[inline]
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#[rustc_const_stable(feature = "duration_consts", since = "1.32.0")]
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pub const fn from_nanos(nanos: u64) -> Duration {
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Duration {
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secs: nanos / (NANOS_PER_SEC as u64),
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nanos: (nanos % (NANOS_PER_SEC as u64)) as u32,
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}
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}
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/// Returns true if this `Duration` spans no time.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert!(Duration::ZERO.is_zero());
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/// assert!(Duration::new(0, 0).is_zero());
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/// assert!(Duration::from_nanos(0).is_zero());
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/// assert!(Duration::from_secs(0).is_zero());
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///
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/// assert!(!Duration::new(1, 1).is_zero());
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/// assert!(!Duration::from_nanos(1).is_zero());
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/// assert!(!Duration::from_secs(1).is_zero());
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/// ```
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#[stable(feature = "duration_zero", since = "1.53.0")]
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#[rustc_const_stable(feature = "duration_zero", since = "1.53.0")]
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#[inline]
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pub const fn is_zero(&self) -> bool {
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self.secs == 0 && self.nanos == 0
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}
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/// Returns the number of _whole_ seconds contained by this `Duration`.
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///
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/// The returned value does not include the fractional (nanosecond) part of the
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/// duration, which can be obtained using [`subsec_nanos`].
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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/// assert_eq!(duration.as_secs(), 5);
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/// ```
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///
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/// To determine the total number of seconds represented by the `Duration`,
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/// use `as_secs` in combination with [`subsec_nanos`]:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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///
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/// assert_eq!(5.730023852,
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/// duration.as_secs() as f64
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/// + duration.subsec_nanos() as f64 * 1e-9);
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/// ```
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///
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/// [`subsec_nanos`]: Duration::subsec_nanos
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#[stable(feature = "duration", since = "1.3.0")]
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#[rustc_const_stable(feature = "duration", since = "1.32.0")]
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#[inline]
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pub const fn as_secs(&self) -> u64 {
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self.secs
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}
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/// Returns the fractional part of this `Duration`, in whole milliseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by milliseconds. The returned number always represents a
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/// fractional portion of a second (i.e., it is less than one thousand).
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(5432);
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/// assert_eq!(duration.as_secs(), 5);
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/// assert_eq!(duration.subsec_millis(), 432);
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/// ```
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#[stable(feature = "duration_extras", since = "1.27.0")]
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#[rustc_const_stable(feature = "duration_extras", since = "1.32.0")]
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#[inline]
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pub const fn subsec_millis(&self) -> u32 {
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self.nanos / NANOS_PER_MILLI
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}
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/// Returns the fractional part of this `Duration`, in whole microseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by microseconds. The returned number always represents a
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/// fractional portion of a second (i.e., it is less than one million).
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_micros(1_234_567);
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/// assert_eq!(duration.as_secs(), 1);
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/// assert_eq!(duration.subsec_micros(), 234_567);
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/// ```
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#[stable(feature = "duration_extras", since = "1.27.0")]
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#[rustc_const_stable(feature = "duration_extras", since = "1.32.0")]
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#[inline]
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pub const fn subsec_micros(&self) -> u32 {
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self.nanos / NANOS_PER_MICRO
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}
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/// Returns the fractional part of this `Duration`, in nanoseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by nanoseconds. The returned number always represents a
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/// fractional portion of a second (i.e., it is less than one billion).
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(5010);
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/// assert_eq!(duration.as_secs(), 5);
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/// assert_eq!(duration.subsec_nanos(), 10_000_000);
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/// ```
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#[stable(feature = "duration", since = "1.3.0")]
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#[rustc_const_stable(feature = "duration", since = "1.32.0")]
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#[inline]
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pub const fn subsec_nanos(&self) -> u32 {
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self.nanos
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}
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/// Returns the total number of whole milliseconds contained by this `Duration`.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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/// assert_eq!(duration.as_millis(), 5730);
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/// ```
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#[stable(feature = "duration_as_u128", since = "1.33.0")]
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#[rustc_const_stable(feature = "duration_as_u128", since = "1.33.0")]
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#[inline]
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pub const fn as_millis(&self) -> u128 {
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self.secs as u128 * MILLIS_PER_SEC as u128 + (self.nanos / NANOS_PER_MILLI) as u128
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}
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/// Returns the total number of whole microseconds contained by this `Duration`.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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/// assert_eq!(duration.as_micros(), 5730023);
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/// ```
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#[stable(feature = "duration_as_u128", since = "1.33.0")]
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#[rustc_const_stable(feature = "duration_as_u128", since = "1.33.0")]
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#[inline]
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pub const fn as_micros(&self) -> u128 {
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self.secs as u128 * MICROS_PER_SEC as u128 + (self.nanos / NANOS_PER_MICRO) as u128
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}
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/// Returns the total number of nanoseconds contained by this `Duration`.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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/// assert_eq!(duration.as_nanos(), 5730023852);
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/// ```
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#[stable(feature = "duration_as_u128", since = "1.33.0")]
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#[rustc_const_stable(feature = "duration_as_u128", since = "1.33.0")]
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#[inline]
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pub const fn as_nanos(&self) -> u128 {
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self.secs as u128 * NANOS_PER_SEC as u128 + self.nanos as u128
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}
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/// Checked `Duration` addition. Computes `self + other`, returning [`None`]
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/// if overflow occurred.
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::new(0, 0).checked_add(Duration::new(0, 1)), Some(Duration::new(0, 1)));
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/// assert_eq!(Duration::new(1, 0).checked_add(Duration::new(u64::MAX, 0)), None);
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/// ```
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#[stable(feature = "duration_checked_ops", since = "1.16.0")]
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#[inline]
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#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
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pub const fn checked_add(self, rhs: Duration) -> Option<Duration> {
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if let Some(mut secs) = self.secs.checked_add(rhs.secs) {
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let mut nanos = self.nanos + rhs.nanos;
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if nanos >= NANOS_PER_SEC {
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nanos -= NANOS_PER_SEC;
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if let Some(new_secs) = secs.checked_add(1) {
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secs = new_secs;
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} else {
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return None;
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}
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}
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debug_assert!(nanos < NANOS_PER_SEC);
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Some(Duration { secs, nanos })
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} else {
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None
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}
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}
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|
|
/// Saturating `Duration` addition. Computes `self + other`, returning [`Duration::MAX`]
|
|
/// if overflow occurred.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// #![feature(duration_constants)]
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(0, 0).saturating_add(Duration::new(0, 1)), Duration::new(0, 1));
|
|
/// assert_eq!(Duration::new(1, 0).saturating_add(Duration::new(u64::MAX, 0)), Duration::MAX);
|
|
/// ```
|
|
#[stable(feature = "duration_saturating_ops", since = "1.53.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn saturating_add(self, rhs: Duration) -> Duration {
|
|
match self.checked_add(rhs) {
|
|
Some(res) => res,
|
|
None => Duration::MAX,
|
|
}
|
|
}
|
|
|
|
/// Checked `Duration` subtraction. Computes `self - other`, returning [`None`]
|
|
/// if the result would be negative or if overflow occurred.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// Basic usage:
|
|
///
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(0, 1).checked_sub(Duration::new(0, 0)), Some(Duration::new(0, 1)));
|
|
/// assert_eq!(Duration::new(0, 0).checked_sub(Duration::new(0, 1)), None);
|
|
/// ```
|
|
#[stable(feature = "duration_checked_ops", since = "1.16.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn checked_sub(self, rhs: Duration) -> Option<Duration> {
|
|
if let Some(mut secs) = self.secs.checked_sub(rhs.secs) {
|
|
let nanos = if self.nanos >= rhs.nanos {
|
|
self.nanos - rhs.nanos
|
|
} else if let Some(sub_secs) = secs.checked_sub(1) {
|
|
secs = sub_secs;
|
|
self.nanos + NANOS_PER_SEC - rhs.nanos
|
|
} else {
|
|
return None;
|
|
};
|
|
debug_assert!(nanos < NANOS_PER_SEC);
|
|
Some(Duration { secs, nanos })
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Saturating `Duration` subtraction. Computes `self - other`, returning [`Duration::ZERO`]
|
|
/// if the result would be negative or if overflow occurred.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(0, 1).saturating_sub(Duration::new(0, 0)), Duration::new(0, 1));
|
|
/// assert_eq!(Duration::new(0, 0).saturating_sub(Duration::new(0, 1)), Duration::ZERO);
|
|
/// ```
|
|
#[stable(feature = "duration_saturating_ops", since = "1.53.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn saturating_sub(self, rhs: Duration) -> Duration {
|
|
match self.checked_sub(rhs) {
|
|
Some(res) => res,
|
|
None => Duration::ZERO,
|
|
}
|
|
}
|
|
|
|
/// Checked `Duration` multiplication. Computes `self * other`, returning
|
|
/// [`None`] if overflow occurred.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// Basic usage:
|
|
///
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(0, 500_000_001).checked_mul(2), Some(Duration::new(1, 2)));
|
|
/// assert_eq!(Duration::new(u64::MAX - 1, 0).checked_mul(2), None);
|
|
/// ```
|
|
#[stable(feature = "duration_checked_ops", since = "1.16.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn checked_mul(self, rhs: u32) -> Option<Duration> {
|
|
// Multiply nanoseconds as u64, because it cannot overflow that way.
|
|
let total_nanos = self.nanos as u64 * rhs as u64;
|
|
let extra_secs = total_nanos / (NANOS_PER_SEC as u64);
|
|
let nanos = (total_nanos % (NANOS_PER_SEC as u64)) as u32;
|
|
if let Some(s) = self.secs.checked_mul(rhs as u64) {
|
|
if let Some(secs) = s.checked_add(extra_secs) {
|
|
debug_assert!(nanos < NANOS_PER_SEC);
|
|
return Some(Duration { secs, nanos });
|
|
}
|
|
}
|
|
None
|
|
}
|
|
|
|
/// Saturating `Duration` multiplication. Computes `self * other`, returning
|
|
/// [`Duration::MAX`] if overflow occurred.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// ```
|
|
/// #![feature(duration_constants)]
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(0, 500_000_001).saturating_mul(2), Duration::new(1, 2));
|
|
/// assert_eq!(Duration::new(u64::MAX - 1, 0).saturating_mul(2), Duration::MAX);
|
|
/// ```
|
|
#[stable(feature = "duration_saturating_ops", since = "1.53.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn saturating_mul(self, rhs: u32) -> Duration {
|
|
match self.checked_mul(rhs) {
|
|
Some(res) => res,
|
|
None => Duration::MAX,
|
|
}
|
|
}
|
|
|
|
/// Checked `Duration` division. Computes `self / other`, returning [`None`]
|
|
/// if `other == 0`.
|
|
///
|
|
/// # Examples
|
|
///
|
|
/// Basic usage:
|
|
///
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// assert_eq!(Duration::new(2, 0).checked_div(2), Some(Duration::new(1, 0)));
|
|
/// assert_eq!(Duration::new(1, 0).checked_div(2), Some(Duration::new(0, 500_000_000)));
|
|
/// assert_eq!(Duration::new(2, 0).checked_div(0), None);
|
|
/// ```
|
|
#[stable(feature = "duration_checked_ops", since = "1.16.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn checked_div(self, rhs: u32) -> Option<Duration> {
|
|
if rhs != 0 {
|
|
let secs = self.secs / (rhs as u64);
|
|
let carry = self.secs - secs * (rhs as u64);
|
|
let extra_nanos = carry * (NANOS_PER_SEC as u64) / (rhs as u64);
|
|
let nanos = self.nanos / rhs + (extra_nanos as u32);
|
|
debug_assert!(nanos < NANOS_PER_SEC);
|
|
Some(Duration { secs, nanos })
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Returns the number of seconds contained by this `Duration` as `f64`.
|
|
///
|
|
/// The returned value does include the fractional (nanosecond) part of the duration.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// assert_eq!(dur.as_secs_f64(), 2.7);
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn as_secs_f64(&self) -> f64 {
|
|
(self.secs as f64) + (self.nanos as f64) / (NANOS_PER_SEC as f64)
|
|
}
|
|
|
|
/// Returns the number of seconds contained by this `Duration` as `f32`.
|
|
///
|
|
/// The returned value does include the fractional (nanosecond) part of the duration.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// assert_eq!(dur.as_secs_f32(), 2.7);
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn as_secs_f32(&self) -> f32 {
|
|
(self.secs as f32) + (self.nanos as f32) / (NANOS_PER_SEC as f32)
|
|
}
|
|
|
|
/// Creates a new `Duration` from the specified number of seconds represented
|
|
/// as `f64`.
|
|
///
|
|
/// # Panics
|
|
/// This constructor will panic if `secs` is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::from_secs_f64(2.7);
|
|
/// assert_eq!(dur, Duration::new(2, 700_000_000));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn from_secs_f64(secs: f64) -> Duration {
|
|
match Duration::try_from_secs_f64(secs) {
|
|
Ok(v) => v,
|
|
Err(e) => crate::panicking::panic(e.description()),
|
|
}
|
|
}
|
|
|
|
/// The checked version of [`from_secs_f64`].
|
|
///
|
|
/// [`from_secs_f64`]: Duration::from_secs_f64
|
|
///
|
|
/// This constructor will return an `Err` if `secs` is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// #![feature(duration_checked_float)]
|
|
///
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::try_from_secs_f64(2.7);
|
|
/// assert_eq!(dur, Ok(Duration::new(2, 700_000_000)));
|
|
///
|
|
/// let negative = Duration::try_from_secs_f64(-5.0);
|
|
/// assert!(negative.is_err());
|
|
/// ```
|
|
#[unstable(feature = "duration_checked_float", issue = "83400")]
|
|
#[inline]
|
|
pub const fn try_from_secs_f64(secs: f64) -> Result<Duration, FromSecsError> {
|
|
const MAX_NANOS_F64: f64 = ((u64::MAX as u128 + 1) * (NANOS_PER_SEC as u128)) as f64;
|
|
let nanos = secs * (NANOS_PER_SEC as f64);
|
|
if !nanos.is_finite() {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::NonFinite })
|
|
} else if nanos >= MAX_NANOS_F64 {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::Overflow })
|
|
} else if nanos < 0.0 {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::Underflow })
|
|
} else {
|
|
let nanos = nanos as u128;
|
|
Ok(Duration {
|
|
secs: (nanos / (NANOS_PER_SEC as u128)) as u64,
|
|
nanos: (nanos % (NANOS_PER_SEC as u128)) as u32,
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Creates a new `Duration` from the specified number of seconds represented
|
|
/// as `f32`.
|
|
///
|
|
/// # Panics
|
|
/// This constructor will panic if `secs` is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::from_secs_f32(2.7);
|
|
/// assert_eq!(dur, Duration::new(2, 700_000_000));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn from_secs_f32(secs: f32) -> Duration {
|
|
match Duration::try_from_secs_f32(secs) {
|
|
Ok(v) => v,
|
|
Err(e) => crate::panicking::panic(e.description()),
|
|
}
|
|
}
|
|
|
|
/// The checked version of [`from_secs_f32`].
|
|
///
|
|
/// [`from_secs_f32`]: Duration::from_secs_f32
|
|
///
|
|
/// This constructor will return an `Err` if `secs` is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// #![feature(duration_checked_float)]
|
|
///
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::try_from_secs_f32(2.7);
|
|
/// assert_eq!(dur, Ok(Duration::new(2, 700_000_000)));
|
|
///
|
|
/// let negative = Duration::try_from_secs_f32(-5.0);
|
|
/// assert!(negative.is_err());
|
|
/// ```
|
|
#[unstable(feature = "duration_checked_float", issue = "83400")]
|
|
#[inline]
|
|
pub const fn try_from_secs_f32(secs: f32) -> Result<Duration, FromSecsError> {
|
|
const MAX_NANOS_F32: f32 = ((u64::MAX as u128 + 1) * (NANOS_PER_SEC as u128)) as f32;
|
|
let nanos = secs * (NANOS_PER_SEC as f32);
|
|
if !nanos.is_finite() {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::NonFinite })
|
|
} else if nanos >= MAX_NANOS_F32 {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::Overflow })
|
|
} else if nanos < 0.0 {
|
|
Err(FromSecsError { kind: FromSecsErrorKind::Underflow })
|
|
} else {
|
|
let nanos = nanos as u128;
|
|
Ok(Duration {
|
|
secs: (nanos / (NANOS_PER_SEC as u128)) as u64,
|
|
nanos: (nanos % (NANOS_PER_SEC as u128)) as u32,
|
|
})
|
|
}
|
|
}
|
|
|
|
/// Multiplies `Duration` by `f64`.
|
|
///
|
|
/// # Panics
|
|
/// This method will panic if result is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// assert_eq!(dur.mul_f64(3.14), Duration::new(8, 478_000_000));
|
|
/// assert_eq!(dur.mul_f64(3.14e5), Duration::new(847_800, 0));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn mul_f64(self, rhs: f64) -> Duration {
|
|
Duration::from_secs_f64(rhs * self.as_secs_f64())
|
|
}
|
|
|
|
/// Multiplies `Duration` by `f32`.
|
|
///
|
|
/// # Panics
|
|
/// This method will panic if result is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// // note that due to rounding errors result is slightly different
|
|
/// // from 8.478 and 847800.0
|
|
/// assert_eq!(dur.mul_f32(3.14), Duration::new(8, 478_000_640));
|
|
/// assert_eq!(dur.mul_f32(3.14e5), Duration::new(847799, 969_120_256));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn mul_f32(self, rhs: f32) -> Duration {
|
|
Duration::from_secs_f32(rhs * self.as_secs_f32())
|
|
}
|
|
|
|
/// Divide `Duration` by `f64`.
|
|
///
|
|
/// # Panics
|
|
/// This method will panic if result is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// assert_eq!(dur.div_f64(3.14), Duration::new(0, 859_872_611));
|
|
/// // note that truncation is used, not rounding
|
|
/// assert_eq!(dur.div_f64(3.14e5), Duration::new(0, 8_598));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn div_f64(self, rhs: f64) -> Duration {
|
|
Duration::from_secs_f64(self.as_secs_f64() / rhs)
|
|
}
|
|
|
|
/// Divide `Duration` by `f32`.
|
|
///
|
|
/// # Panics
|
|
/// This method will panic if result is not finite, negative or overflows `Duration`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur = Duration::new(2, 700_000_000);
|
|
/// // note that due to rounding errors result is slightly
|
|
/// // different from 0.859_872_611
|
|
/// assert_eq!(dur.div_f32(3.14), Duration::new(0, 859_872_576));
|
|
/// // note that truncation is used, not rounding
|
|
/// assert_eq!(dur.div_f32(3.14e5), Duration::new(0, 8_598));
|
|
/// ```
|
|
#[stable(feature = "duration_float", since = "1.38.0")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn div_f32(self, rhs: f32) -> Duration {
|
|
Duration::from_secs_f32(self.as_secs_f32() / rhs)
|
|
}
|
|
|
|
/// Divide `Duration` by `Duration` and return `f64`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// #![feature(div_duration)]
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur1 = Duration::new(2, 700_000_000);
|
|
/// let dur2 = Duration::new(5, 400_000_000);
|
|
/// assert_eq!(dur1.div_duration_f64(dur2), 0.5);
|
|
/// ```
|
|
#[unstable(feature = "div_duration", issue = "63139")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn div_duration_f64(self, rhs: Duration) -> f64 {
|
|
self.as_secs_f64() / rhs.as_secs_f64()
|
|
}
|
|
|
|
/// Divide `Duration` by `Duration` and return `f32`.
|
|
///
|
|
/// # Examples
|
|
/// ```
|
|
/// #![feature(div_duration)]
|
|
/// use std::time::Duration;
|
|
///
|
|
/// let dur1 = Duration::new(2, 700_000_000);
|
|
/// let dur2 = Duration::new(5, 400_000_000);
|
|
/// assert_eq!(dur1.div_duration_f32(dur2), 0.5);
|
|
/// ```
|
|
#[unstable(feature = "div_duration", issue = "63139")]
|
|
#[inline]
|
|
#[rustc_const_unstable(feature = "duration_consts_2", issue = "72440")]
|
|
pub const fn div_duration_f32(self, rhs: Duration) -> f32 {
|
|
self.as_secs_f32() / rhs.as_secs_f32()
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration", since = "1.3.0")]
|
|
impl Add for Duration {
|
|
type Output = Duration;
|
|
|
|
fn add(self, rhs: Duration) -> Duration {
|
|
self.checked_add(rhs).expect("overflow when adding durations")
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "time_augmented_assignment", since = "1.9.0")]
|
|
impl AddAssign for Duration {
|
|
fn add_assign(&mut self, rhs: Duration) {
|
|
*self = *self + rhs;
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration", since = "1.3.0")]
|
|
impl Sub for Duration {
|
|
type Output = Duration;
|
|
|
|
fn sub(self, rhs: Duration) -> Duration {
|
|
self.checked_sub(rhs).expect("overflow when subtracting durations")
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "time_augmented_assignment", since = "1.9.0")]
|
|
impl SubAssign for Duration {
|
|
fn sub_assign(&mut self, rhs: Duration) {
|
|
*self = *self - rhs;
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration", since = "1.3.0")]
|
|
impl Mul<u32> for Duration {
|
|
type Output = Duration;
|
|
|
|
fn mul(self, rhs: u32) -> Duration {
|
|
self.checked_mul(rhs).expect("overflow when multiplying duration by scalar")
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "symmetric_u32_duration_mul", since = "1.31.0")]
|
|
impl Mul<Duration> for u32 {
|
|
type Output = Duration;
|
|
|
|
fn mul(self, rhs: Duration) -> Duration {
|
|
rhs * self
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "time_augmented_assignment", since = "1.9.0")]
|
|
impl MulAssign<u32> for Duration {
|
|
fn mul_assign(&mut self, rhs: u32) {
|
|
*self = *self * rhs;
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration", since = "1.3.0")]
|
|
impl Div<u32> for Duration {
|
|
type Output = Duration;
|
|
|
|
fn div(self, rhs: u32) -> Duration {
|
|
self.checked_div(rhs).expect("divide by zero error when dividing duration by scalar")
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "time_augmented_assignment", since = "1.9.0")]
|
|
impl DivAssign<u32> for Duration {
|
|
fn div_assign(&mut self, rhs: u32) {
|
|
*self = *self / rhs;
|
|
}
|
|
}
|
|
|
|
macro_rules! sum_durations {
|
|
($iter:expr) => {{
|
|
let mut total_secs: u64 = 0;
|
|
let mut total_nanos: u64 = 0;
|
|
|
|
for entry in $iter {
|
|
total_secs =
|
|
total_secs.checked_add(entry.secs).expect("overflow in iter::sum over durations");
|
|
total_nanos = match total_nanos.checked_add(entry.nanos as u64) {
|
|
Some(n) => n,
|
|
None => {
|
|
total_secs = total_secs
|
|
.checked_add(total_nanos / NANOS_PER_SEC as u64)
|
|
.expect("overflow in iter::sum over durations");
|
|
(total_nanos % NANOS_PER_SEC as u64) + entry.nanos as u64
|
|
}
|
|
};
|
|
}
|
|
total_secs = total_secs
|
|
.checked_add(total_nanos / NANOS_PER_SEC as u64)
|
|
.expect("overflow in iter::sum over durations");
|
|
total_nanos = total_nanos % NANOS_PER_SEC as u64;
|
|
Duration { secs: total_secs, nanos: total_nanos as u32 }
|
|
}};
|
|
}
|
|
|
|
#[stable(feature = "duration_sum", since = "1.16.0")]
|
|
impl Sum for Duration {
|
|
fn sum<I: Iterator<Item = Duration>>(iter: I) -> Duration {
|
|
sum_durations!(iter)
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration_sum", since = "1.16.0")]
|
|
impl<'a> Sum<&'a Duration> for Duration {
|
|
fn sum<I: Iterator<Item = &'a Duration>>(iter: I) -> Duration {
|
|
sum_durations!(iter)
|
|
}
|
|
}
|
|
|
|
#[stable(feature = "duration_debug_impl", since = "1.27.0")]
|
|
impl fmt::Debug for Duration {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
/// Formats a floating point number in decimal notation.
|
|
///
|
|
/// The number is given as the `integer_part` and a fractional part.
|
|
/// The value of the fractional part is `fractional_part / divisor`. So
|
|
/// `integer_part` = 3, `fractional_part` = 12 and `divisor` = 100
|
|
/// represents the number `3.012`. Trailing zeros are omitted.
|
|
///
|
|
/// `divisor` must not be above 100_000_000. It also should be a power
|
|
/// of 10, everything else doesn't make sense. `fractional_part` has
|
|
/// to be less than `10 * divisor`!
|
|
fn fmt_decimal(
|
|
f: &mut fmt::Formatter<'_>,
|
|
mut integer_part: u64,
|
|
mut fractional_part: u32,
|
|
mut divisor: u32,
|
|
) -> fmt::Result {
|
|
// Encode the fractional part into a temporary buffer. The buffer
|
|
// only need to hold 9 elements, because `fractional_part` has to
|
|
// be smaller than 10^9. The buffer is prefilled with '0' digits
|
|
// to simplify the code below.
|
|
let mut buf = [b'0'; 9];
|
|
|
|
// The next digit is written at this position
|
|
let mut pos = 0;
|
|
|
|
// We keep writing digits into the buffer while there are non-zero
|
|
// digits left and we haven't written enough digits yet.
|
|
while fractional_part > 0 && pos < f.precision().unwrap_or(9) {
|
|
// Write new digit into the buffer
|
|
buf[pos] = b'0' + (fractional_part / divisor) as u8;
|
|
|
|
fractional_part %= divisor;
|
|
divisor /= 10;
|
|
pos += 1;
|
|
}
|
|
|
|
// If a precision < 9 was specified, there may be some non-zero
|
|
// digits left that weren't written into the buffer. In that case we
|
|
// need to perform rounding to match the semantics of printing
|
|
// normal floating point numbers. However, we only need to do work
|
|
// when rounding up. This happens if the first digit of the
|
|
// remaining ones is >= 5.
|
|
if fractional_part > 0 && fractional_part >= divisor * 5 {
|
|
// Round up the number contained in the buffer. We go through
|
|
// the buffer backwards and keep track of the carry.
|
|
let mut rev_pos = pos;
|
|
let mut carry = true;
|
|
while carry && rev_pos > 0 {
|
|
rev_pos -= 1;
|
|
|
|
// If the digit in the buffer is not '9', we just need to
|
|
// increment it and can stop then (since we don't have a
|
|
// carry anymore). Otherwise, we set it to '0' (overflow)
|
|
// and continue.
|
|
if buf[rev_pos] < b'9' {
|
|
buf[rev_pos] += 1;
|
|
carry = false;
|
|
} else {
|
|
buf[rev_pos] = b'0';
|
|
}
|
|
}
|
|
|
|
// If we still have the carry bit set, that means that we set
|
|
// the whole buffer to '0's and need to increment the integer
|
|
// part.
|
|
if carry {
|
|
integer_part += 1;
|
|
}
|
|
}
|
|
|
|
// Determine the end of the buffer: if precision is set, we just
|
|
// use as many digits from the buffer (capped to 9). If it isn't
|
|
// set, we only use all digits up to the last non-zero one.
|
|
let end = f.precision().map(|p| crate::cmp::min(p, 9)).unwrap_or(pos);
|
|
|
|
// If we haven't emitted a single fractional digit and the precision
|
|
// wasn't set to a non-zero value, we don't print the decimal point.
|
|
if end == 0 {
|
|
write!(f, "{}", integer_part)
|
|
} else {
|
|
// SAFETY: We are only writing ASCII digits into the buffer and it was
|
|
// initialized with '0's, so it contains valid UTF8.
|
|
let s = unsafe { crate::str::from_utf8_unchecked(&buf[..end]) };
|
|
|
|
// If the user request a precision > 9, we pad '0's at the end.
|
|
let w = f.precision().unwrap_or(pos);
|
|
write!(f, "{}.{:0<width$}", integer_part, s, width = w)
|
|
}
|
|
}
|
|
|
|
// Print leading '+' sign if requested
|
|
if f.sign_plus() {
|
|
write!(f, "+")?;
|
|
}
|
|
|
|
if self.secs > 0 {
|
|
fmt_decimal(f, self.secs, self.nanos, NANOS_PER_SEC / 10)?;
|
|
f.write_str("s")
|
|
} else if self.nanos >= NANOS_PER_MILLI {
|
|
fmt_decimal(
|
|
f,
|
|
(self.nanos / NANOS_PER_MILLI) as u64,
|
|
self.nanos % NANOS_PER_MILLI,
|
|
NANOS_PER_MILLI / 10,
|
|
)?;
|
|
f.write_str("ms")
|
|
} else if self.nanos >= NANOS_PER_MICRO {
|
|
fmt_decimal(
|
|
f,
|
|
(self.nanos / NANOS_PER_MICRO) as u64,
|
|
self.nanos % NANOS_PER_MICRO,
|
|
NANOS_PER_MICRO / 10,
|
|
)?;
|
|
f.write_str("µs")
|
|
} else {
|
|
fmt_decimal(f, self.nanos as u64, 0, 1)?;
|
|
f.write_str("ns")
|
|
}
|
|
}
|
|
}
|
|
|
|
/// An error which can be returned when converting a floating-point value of seconds
|
|
/// into a [`Duration`].
|
|
///
|
|
/// This error is used as the error type for [`Duration::try_from_secs_f32`] and
|
|
/// [`Duration::try_from_secs_f64`].
|
|
///
|
|
/// # Example
|
|
///
|
|
/// ```
|
|
/// #![feature(duration_checked_float)]
|
|
///
|
|
/// use std::time::Duration;
|
|
///
|
|
/// if let Err(e) = Duration::try_from_secs_f32(-1.0) {
|
|
/// println!("Failed conversion to Duration: {}", e);
|
|
/// }
|
|
/// ```
|
|
#[derive(Debug, Clone, PartialEq, Eq)]
|
|
#[unstable(feature = "duration_checked_float", issue = "83400")]
|
|
pub struct FromSecsError {
|
|
kind: FromSecsErrorKind,
|
|
}
|
|
|
|
impl FromSecsError {
|
|
const fn description(&self) -> &'static str {
|
|
match self.kind {
|
|
FromSecsErrorKind::NonFinite => {
|
|
"got non-finite value when converting float to duration"
|
|
}
|
|
FromSecsErrorKind::Overflow => "overflow when converting float to duration",
|
|
FromSecsErrorKind::Underflow => "underflow when converting float to duration",
|
|
}
|
|
}
|
|
}
|
|
|
|
#[unstable(feature = "duration_checked_float", issue = "83400")]
|
|
impl fmt::Display for FromSecsError {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
fmt::Display::fmt(self.description(), f)
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, PartialEq, Eq)]
|
|
enum FromSecsErrorKind {
|
|
// Value is not a finite value (either infinity or NaN).
|
|
NonFinite,
|
|
// Value is too large to store in a `Duration`.
|
|
Overflow,
|
|
// Value is less than `0.0`.
|
|
Underflow,
|
|
}
|