63 lines
1.6 KiB
Rust
63 lines
1.6 KiB
Rust
#![doc(hidden)]
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use std::ops::{Deref, DerefMut};
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pub enum Suspendable<T> {
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Active(T),
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Suspended,
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}
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impl<T> Suspendable<T> {
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pub fn new(t: T) -> Self {
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Suspendable::Active(t)
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}
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#[inline(always)]
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pub fn suspend(&mut self) -> Self {
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match self {
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Suspendable::Active(_) => std::mem::replace(self, Suspendable::Suspended),
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Suspendable::Suspended => panic!("Attempt to suspend suspended Suspendable"),
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}
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}
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#[inline(always)]
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pub fn resume(&mut self, other: Self) {
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match self {
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Suspendable::Suspended => match other {
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Suspendable::Active(_) => *self = other,
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Suspendable::Suspended => panic!("Attempt to resume from suspended Suspendable"),
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},
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Suspendable::Active(_) => panic!("Attempt to resume non-suspended Suspendable"),
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}
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}
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#[inline(always)]
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pub fn take(self) -> T {
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match self {
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Suspendable::Active(t) => t,
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Suspendable::Suspended => panic!("Attempt to take from suspended Suspendable"),
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}
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}
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}
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impl<T> Deref for Suspendable<T> {
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type Target = T;
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#[inline(always)]
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fn deref(&self) -> &Self::Target {
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match self {
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Suspendable::Suspended => panic!("Suspended Suspendable at deref"),
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Suspendable::Active(t) => t,
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}
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}
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}
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impl<T> DerefMut for Suspendable<T> {
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#[inline(always)]
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fn deref_mut(&mut self) -> &mut Self::Target {
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match self {
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Suspendable::Suspended => panic!("Empty Suspendable at deref_mut"),
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Suspendable::Active(t) => t,
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}
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}
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}
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