//! Efficient collections for Unicode data. //! //! This module is published as its own crate ([`icu_collections`](https://docs.rs/icu_collections/latest/icu_collections/)) //! and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project. //! //! ICU4X [`CodePointTrie`](crate::codepointtrie::CodePointTrie) provides a read-only view of `CodePointTrie` data that is exported //! from ICU4C. Detailed information about the design of the data structure can be found in the documentation //! for the [`CodePointTrie`](crate::codepointtrie::CodePointTrie) struct. //! //! ICU4X [`CodePointInversionList`](`crate::codepointinvlist::CodePointInversionList`) provides necessary functionality for highly efficient querying of sets of Unicode characters. //! It is an implementation of the existing [ICU4C UnicodeSet API](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1UnicodeSet.html). //! //! ICU4X [`Char16Trie`](`crate::char16trie::Char16Trie`) provides a data structure for a space-efficient and time-efficient lookup of //! sequences of 16-bit units (commonly but not necessarily UTF-16 code units) //! which map to integer values. //! It is an implementation of the existing [ICU4C UCharsTrie](https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1UCharsTrie.html) //! / [ICU4J CharsTrie](https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/util/CharsTrie.html) API.
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