Enum icu_collections::codepointtrie::TrieType

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pub enum TrieType {
    Fast = 0,
    Small = 1,
}
Expand description

The type of trie represents whether the trie has an optimization that would make it smaller or faster.

Regarding performance, a trie being a small or fast type affects the number of array lookups needed for code points in the range [0x1000, 0x10000). In this range, Small tries use 4 array lookups, while Fast tries use 2 array lookups. Code points before the interval (in [0, 0x1000)) will always use 2 array lookups. Code points after the interval (in [0x10000, 0x10FFFF]) will always use 4 array lookups.

Regarding size, Fast type tries are larger than Small type tries because the minimum size of the index array is larger. The minimum size is the “fast max” limit, which is the limit of the range of code points with 2 array lookups.

See the document Unicode Properties and Code Point Tries in ICU4X.

Also see UCPTrieType in ICU4C.

Variants§

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Fast = 0

Represents the “fast” type code point tries for the TrieType trait. The “fast max” limit is set to 0xffff.

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Small = 1

Represents the “small” type code point tries for the TrieType trait. The “fast max” limit is set to 0x0fff.

Trait Implementations§

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impl Clone for TrieType

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fn clone(&self) -> TrieType

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TrieType

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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 PartialEq for TrieType

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fn eq(&self, other: &TrieType) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl TryFrom<u8> for TrieType

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(trie_type_int: u8) -> Result<TrieType, Error>

Performs the conversion.
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impl Copy for TrieType

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impl Eq for TrieType

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impl StructuralPartialEq for TrieType

Auto Trait Implementations§

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<U> 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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> ErasedDestructor for T
where T: 'static,