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|
//! This crate is a Rust port of Google's high-performance [SwissTable] hash
//! map, adapted to make it a drop-in replacement for Rust's standard `HashMap`
//! and `HashSet` types.
//!
//! The original C++ version of [SwissTable] can be found [here], and this
//! [CppCon talk] gives an overview of how the algorithm works.
//!
//! [SwissTable]: https://abseil.io/blog/20180927-swisstables
//! [here]: https://github.com/abseil/abseil-cpp/blob/master/absl/container/internal/raw_hash_set.h
//! [CppCon talk]: https://www.youtube.com/watch?v=ncHmEUmJZf4
#![no_std]
#![cfg_attr(
feature = "nightly",
feature(
test,
core_intrinsics,
dropck_eyepatch,
min_specialization,
extend_one,
allocator_api,
slice_ptr_get,
nonnull_slice_from_raw_parts,
maybe_uninit_array_assume_init,
build_hasher_simple_hash_one
)
)]
#![allow(
clippy::doc_markdown,
clippy::module_name_repetitions,
clippy::must_use_candidate,
clippy::option_if_let_else,
clippy::redundant_else,
clippy::manual_map,
clippy::missing_safety_doc,
clippy::missing_errors_doc
)]
#![warn(missing_docs)]
#![warn(rust_2018_idioms)]
#[cfg(test)]
#[macro_use]
extern crate std;
#[cfg_attr(test, macro_use)]
extern crate alloc;
#[cfg(feature = "nightly")]
#[cfg(doctest)]
doc_comment::doctest!("../README.md");
#[macro_use]
mod macros;
#[cfg(feature = "raw")]
/// Experimental and unsafe `RawTable` API. This module is only available if the
/// `raw` feature is enabled.
pub mod raw {
// The RawTable API is still experimental and is not properly documented yet.
#[allow(missing_docs)]
#[path = "mod.rs"]
mod inner;
pub use inner::*;
#[cfg(feature = "rayon")]
/// [rayon]-based parallel iterator types for hash maps.
/// You will rarely need to interact with it directly unless you have need
/// to name one of the iterator types.
///
/// [rayon]: https://docs.rs/rayon/1.0/rayon
pub mod rayon {
pub use crate::external_trait_impls::rayon::raw::*;
}
}
#[cfg(not(feature = "raw"))]
mod raw;
mod external_trait_impls;
mod map;
#[cfg(feature = "rustc-internal-api")]
mod rustc_entry;
mod scopeguard;
mod set;
pub mod hash_map {
//! A hash map implemented with quadratic probing and SIMD lookup.
pub use crate::map::*;
#[cfg(feature = "rustc-internal-api")]
pub use crate::rustc_entry::*;
#[cfg(feature = "rayon")]
/// [rayon]-based parallel iterator types for hash maps.
/// You will rarely need to interact with it directly unless you have need
/// to name one of the iterator types.
///
/// [rayon]: https://docs.rs/rayon/1.0/rayon
pub mod rayon {
pub use crate::external_trait_impls::rayon::map::*;
}
}
pub mod hash_set {
//! A hash set implemented as a `HashMap` where the value is `()`.
pub use crate::set::*;
#[cfg(feature = "rayon")]
/// [rayon]-based parallel iterator types for hash sets.
/// You will rarely need to interact with it directly unless you have need
/// to name one of the iterator types.
///
/// [rayon]: https://docs.rs/rayon/1.0/rayon
pub mod rayon {
pub use crate::external_trait_impls::rayon::set::*;
}
}
pub use crate::map::HashMap;
pub use crate::set::HashSet;
/// The error type for `try_reserve` methods.
#[derive(Clone, PartialEq, Eq, Debug)]
pub enum TryReserveError {
/// Error due to the computed capacity exceeding the collection's maximum
/// (usually `isize::MAX` bytes).
CapacityOverflow,
/// The memory allocator returned an error
AllocError {
/// The layout of the allocation request that failed.
layout: alloc::alloc::Layout,
},
}
/// Wrapper around `Bump` which allows it to be used as an allocator for
/// `HashMap`, `HashSet` and `RawTable`.
///
/// `Bump` can be used directly without this wrapper on nightly if you enable
/// the `allocator-api` feature of the `bumpalo` crate.
#[cfg(feature = "bumpalo")]
#[derive(Clone, Copy, Debug)]
pub struct BumpWrapper<'a>(pub &'a bumpalo::Bump);
#[cfg(feature = "bumpalo")]
#[test]
fn test_bumpalo() {
use bumpalo::Bump;
let bump = Bump::new();
let mut map = HashMap::new_in(BumpWrapper(&bump));
map.insert(0, 1);
}
|
