38 lines
574 B
Rust
38 lines
574 B
Rust
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use std::collections::HashSet;
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/// Trait to toggle the presence of a value (like a tag) in a set.
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pub trait Togglable
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{
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type Item: ?Sized;
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fn toggle(&mut self, item: &Self::Item);
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fn is_toggled(&self, item: &Self::Item) -> bool;
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}
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impl Togglable for HashSet<String>
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{
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type Item = str;
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fn toggle(&mut self, item: &str)
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{
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if self.contains(item)
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{
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self.remove(item);
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}
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else
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{
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self.insert(item.to_owned());
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}
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}
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fn is_toggled(&self, item: &str) -> bool
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{
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self.contains(item)
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}
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}
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