45 lines
974 B
Rust
45 lines
974 B
Rust
use super::*;
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pub struct SingleShotEventual<T>
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where
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T: Unpin,
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{
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eventual: EventualValue<T>,
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drop_value: Option<T>,
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}
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impl<T> Drop for SingleShotEventual<T>
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where
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T: Unpin,
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{
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fn drop(&mut self) {
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if let Some(drop_value) = self.drop_value.take() {
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self.eventual.resolve(drop_value);
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}
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}
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}
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impl<T> SingleShotEventual<T>
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where
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T: Unpin,
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{
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pub fn new(drop_value: Option<T>) -> Self {
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Self {
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eventual: EventualValue::new(),
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drop_value,
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}
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}
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// Can only call this once, it consumes the eventual
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pub fn resolve(mut self, value: T) -> EventualResolvedFuture<EventualValue<T>> {
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// If we resolve, we don't want to resolve again to the drop value
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self.drop_value = None;
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// Resolve to the specified value
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self.eventual.resolve(value)
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}
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pub fn instance(&self) -> EventualValueFuture<T> {
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self.eventual.instance()
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}
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}
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