Struct OnceSet

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pub struct OnceSet<T>(/* private fields */);

Expand description

A HashSet that only allows insertions and uses interior mutablity. This allows it to be used in a global static.

Implementations§

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impl<T> OnceSet<T>
where T: Eq + Hash,

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pub const fn new() -> Self

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pub fn insert(&self, val: T) -> bool

Insert val into the set. Returns false if val had previously been added to the set; otherwise returns true.

Trait Implementations§

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impl<T: Debug> Debug for OnceSet<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl<T: Default> Default for OnceSet<T>

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fn default() -> OnceSet<T>

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<T> UnwindSafe for OnceSet<T>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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