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#![deny(unsafe_code)] #![doc(html_root_url = "https://docs.rs/indexmap/1/")] #![cfg_attr(not(has_std), no_std)] //! [`IndexMap`] is a hash table where the iteration order of the key-value //! pairs is independent of the hash values of the keys. //! //! [`IndexSet`] is a corresponding hash set using the same implementation and //! with similar properties. //! //! [`IndexMap`]: map/struct.IndexMap.html //! [`IndexSet`]: set/struct.IndexSet.html //! //! //! ### Feature Highlights //! //! [`IndexMap`] and [`IndexSet`] are drop-in compatible with the std `HashMap` //! and `HashSet`, but they also have some features of note: //! //! - The ordering semantics (see their documentation for details) //! - Sorting methods and the [`.pop()`][IndexMap::pop] methods. //! - The [`Equivalent`] trait, which offers more flexible equality definitions //! between borrowed and owned versions of keys. //! - The [`MutableKeys`][map::MutableKeys] trait, which gives opt-in mutable //! access to hash map keys. //! //! ### Rust Version //! //! This version of indexmap requires Rust 1.18 or later, or 1.30+ for //! development builds, and Rust 1.36+ for using with `alloc` (without `std`), //! see below. //! //! The indexmap 1.x release series will use a carefully considered version //! upgrade policy, where in a later 1.x version, we will raise the minimum //! required Rust version. //! //! ## No Standard Library Targets //! //! From Rust 1.36, this crate supports being built without `std`, requiring //! `alloc` instead. This is enabled automatically when it is detected that //! `std` is not available. There is no crate feature to enable/disable to //! trigger this. It can be tested by building for a std-less target. //! //! - Creating maps and sets using [`new`][IndexMap::new] and //! [`with_capacity`][IndexMap::with_capacity] is unavailable without `std`. //! Use methods [`IndexMap::default`][def], //! [`with_hasher`][IndexMap::with_hasher], //! [`with_capacity_and_hasher`][IndexMap::with_capacity_and_hasher] instead. //! A no-std compatible hasher will be needed as well, for example //! from the crate `twox-hash`. //! - Macros [`indexmap!`] and [`indexset!`] are unavailable without `std`. //! //! [def]: map/struct.IndexMap.html#impl-Default #[cfg(not(has_std))] #[macro_use(vec)] extern crate alloc; #[cfg(not(has_std))] pub(crate) mod std { pub use core::*; pub mod alloc { pub use ::alloc::*; } pub mod collections { pub use ::alloc::collections::*; } pub use ::alloc::vec as vec; } #[cfg(not(has_std))] use std::vec::Vec; #[macro_use] mod macros; #[cfg(feature = "serde-1")] mod serde; mod util; mod equivalent; mod mutable_keys; pub mod set; pub mod map; // Placed after `map` and `set` so new `rayon` methods on the types // are documented after the "normal" methods. #[cfg(feature = "rayon")] mod rayon; pub use equivalent::Equivalent; pub use map::IndexMap; pub use set::IndexSet; // shared private items /// Hash value newtype. Not larger than usize, since anything larger /// isn't used for selecting position anyway. #[derive(Copy, Debug)] struct HashValue(usize); impl HashValue { #[inline(always)] fn get(self) -> usize { self.0 } } impl Clone for HashValue { #[inline] fn clone(&self) -> Self { *self } } impl PartialEq for HashValue { #[inline] fn eq(&self, rhs: &Self) -> bool { self.0 == rhs.0 } } #[derive(Copy, Clone, Debug)] struct Bucket<K, V> { hash: HashValue, key: K, value: V, } impl<K, V> Bucket<K, V> { // field accessors -- used for `f` instead of closures in `.map(f)` fn key_ref(&self) -> &K { &self.key } fn value_ref(&self) -> &V { &self.value } fn value_mut(&mut self) -> &mut V { &mut self.value } fn key(self) -> K { self.key } fn key_value(self) -> (K, V) { (self.key, self.value) } fn refs(&self) -> (&K, &V) { (&self.key, &self.value) } fn ref_mut(&mut self) -> (&K, &mut V) { (&self.key, &mut self.value) } fn muts(&mut self) -> (&mut K, &mut V) { (&mut self.key, &mut self.value) } } trait Entries { type Entry; fn into_entries(self) -> Vec<Self::Entry>; fn as_entries(&self) -> &[Self::Entry]; fn as_entries_mut(&mut self) -> &mut [Self::Entry]; fn with_entries<F>(&mut self, f: F) where F: FnOnce(&mut [Self::Entry]); }