vendor/parking_lot/src/util.rs

   1 // Copyright 2016 Amanieu d'Antras
   2 //
   3 // Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
   4 // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
   5 // http://opensource.org/licenses/MIT>, at your option. This file may not be
   6 // copied, modified, or distributed except according to those terms.
   7
   8 use std::time::{Duration, Instant};
   9
  10 // Option::unchecked_unwrap
  11 pub trait UncheckedOptionExt<T> {
  12     unsafe fn unchecked_unwrap(self) -> T;
  13 }
  14
  15 impl<T> UncheckedOptionExt<T> for Option<T> {
  16     #[inline]
  17     unsafe fn unchecked_unwrap(self) -> T {
  18         match self {
  19             Some(x) => x,
  20             None => unreachable(),
  21         }
  22     }
  23 }
  24
  25 // hint::unreachable_unchecked() in release mode
  26 #[inline]
  27 unsafe fn unreachable() -> ! {
  28     if cfg!(debug_assertions) {
  29         unreachable!();
  30     } else {
  31         core::hint::unreachable_unchecked()
  32     }
  33 }
  34
  35 #[inline]
  36 pub fn to_deadline(timeout: Duration) -> Option<Instant> {
  37     Instant::now().checked_add(timeout)
  38 }