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John Doty 2024-03-08 11:03:01 -08:00
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
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# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
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# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
name = "slotmap"
version = "1.0.7"
authors = ["Orson Peters <orsonpeters@gmail.com>"]
description = "Slotmap data structure"
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Copyright (c) 2021 Orson Peters <orsonpeters@gmail.com>
This software is provided 'as-is', without any express or implied warranty. In
no event will the authors be held liable for any damages arising from the use of
this software.
Permission is granted to anyone to use this software for any purpose, including
commercial applications, and to alter it and redistribute it freely, subject to
the following restrictions:
1. The origin of this software must not be misrepresented; you must not claim
that you wrote the original software. If you use this software in a product,
an acknowledgment in the product documentation would be appreciated but is
not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

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# slotmap
A Rust library providing three containers with persistent unique keys to access
stored values, `SlotMap`, `HopSlotMap` and `DenseSlotMap`. Upon insertion a key
is returned that can be used to later access or remove the values. Insertion,
deletion and access all take O(1) time with low overhead. Great for storing
collections of objects that need stable, safe references but have no clear
ownership otherwise, such as game entities or graph nodes. Two secondary maps,
`SecondaryMap` and `SparseSecondaryMap` are also provided that allow you to map
further objects to the keys created by one of the slot maps. Please refer to
[**the documentation**](https://docs.rs/slotmap) for more information.
The minimum required stable Rust version for `slotmap` is 1.49. To start using
`slotmap` add the following to your `Cargo.toml`:
```toml
[dependencies]
slotmap = "1.0"
```
# Example
A short example:
```rust
use slotmap::{SlotMap, SecondaryMap};
let mut sm = SlotMap::new();
let foo = sm.insert("foo"); // Key generated on insert.
let bar = sm.insert("bar");
assert_eq!(sm[foo], "foo");
assert_eq!(sm[bar], "bar");
sm.remove(bar);
let reuse = sm.insert("reuse"); // Space from bar reused.
assert_eq!(sm.contains_key(bar), false); // After deletion a key stays invalid.
let mut sec = SecondaryMap::new();
sec.insert(foo, "noun"); // We provide the key for secondary maps.
sec.insert(reuse, "verb");
for (key, val) in sm {
println!("{} is a {}", val, sec[key]);
}
```
# License
`slotmap` is released under the Zlib license, a permissive license. It is
OSI and FSF approved and GPL compatible.

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Version 1.0.7
=============
- Added `clone_from` implementations for all slot maps.
- Added `try_insert_with_key` methods that accept a fallible closure.
- Improved performance of insertion and key hashing.
- Made `new_key_type` resistant to shadowing.
- Made iterators clonable regardless of item type clonability.
Version 1.0.6
=============
- Made `Key` trait unsafe, as it was erroneously safe to implement.
Version 1.0.5
=============
- Added fuzzing for extra testing.
- Fixed an issue that could cause a segfault when using `HopSlotMap::retain`
that had the same underlying cause as the fix in 1.0.4 but was missed.
Version 1.0.4
=============
- Fixed an issue that could cause a segfault when using `HopSlotMap::drain`.
All versions 0.3+ are affected, and thus yanked.
Version 1.0.3
=============
- Made `get_disjoint_mut` available on stable Rust 1.51 and up.
- Added unchecked variants for the getters on `SparseSecondaryMap`.
Version 1.0.2
=============
- Fixed the `new_key_type!` macro, it assumed the `Key` trait was in scope.
- Updated code base with more stringent (clippy) warnings, and many small code
quality and documentation changes.
- Documented the minimum required stable Rust version, which is 1.49.
Version 1.0.1
=============
- Fixed an instance where an uninitialized `[u32; N]` was created. The
uninitialized values were never read - the code always initialized them
before reading - but simply having the variable be uninitialized (despite all
bit patterns being valid) is technically undefined behavior.
Version 1.0.0
=============
- Removed all `Copy` trait restrictions of value types stable Rust! There are
no longer any restrictions on the types you can store in any of the
slot maps. For that reason `Slottable` was deprecated as well.
- `no_std` support was added, use it by opting out of the default feature `std`.
- Added `sm.get_disjoint_mut([k1, k2, ...])` which allows you to get mutable
references from multiple disjoint keys at the same time. This requires
`min-const-generics` to be stabilized, so until Rust 1.51 comes out this is
only available on nightly by setting the `unstable` feature.
- Added an `Entry` API to the secondary maps.
- Added `derive(Clone)` for iterators where possible.
- Replaced `Into<KeyData>` with `Key::data()`.
- `SecondaryMap` now uses minimal space overhead. Each slot now uses
`max(sizeof(T), 4)` bytes.
- Moved `SlotMap` to the `basic` module.
Version 0.4.1
=============
- Backport of fix made in 1.0.4.
Version 0.4.0
=============
- Codebase moved to 2018 Edition.
- Reintroduce `DenseSlotMap` - an overzealous removal in 0.3.0.
- Added support for `try_reserve`.
- Added support for custom hashers in `SparseSecondaryMap`.
- `SparseSecondaryMap` and `SecondaryMap` can now be cloned.
- Keys have a more terse debug output.
- Fixed a bug that caused an overflowing left shift on 32-bit targets.
Version 0.3.0
=============
- Massive rework, with a focus on secondary maps and custom keys to prevent
cross-slotmap key usage.
- Removed `DenseSlotMap` in favour of `HopSlotMap` as the latter performs
better when secondary maps are in use.
- Unfortunately due to the redesign the first slot in a slot map must now
always be empty. This means some deserializations of slot maps serialized
with a version before 0.3.0 can fail.
- Added `SecondaryMap` and `SparseSecondaryMap`, which allows you to associate
extra data with keys given by a slot map.
- Added `DefaultKey`, custom key types, and support for them on all slot maps
and secondary maps. You must now always specify the key type you're using
with a slot map, so `SlotMap<i32>` would be `SlotMap<DefaultKey, i32>`. It is
recommended to make a custom key type with `new_key_type!` for any slot map
you create, as this entirely prevents using the wrong key on the wrong slot
map.
- `KeyData` now has `as_ffi` and `from_ffi` functions that convert the data
that makes up a key to/from an `u64`. This allows you to use slot map keys
as opaque handles in FFI code.
Version 0.2.1
=============
- Fixed a potential uninitialized memory vulnerability. No uninitialized memory
was read or used directly, but Rust's assumptions could lead to it. Yanked
all previous versions as they were all vulnerable.
- Made a `Key` member non-zero so that `Option<Key>` is optimized.
Version 0.2.0
=============
Start of version history.

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fn main() {
let is_nightly = version_check::is_feature_flaggable() == Some(true);
let is_at_least_1_49 = version_check::is_min_version("1.49.0").unwrap_or(false);
let is_at_least_1_51 = version_check::is_min_version("1.51.0").unwrap_or(false);
if !is_at_least_1_49 {
println!("cargo:warning=slotmap requires rustc => 1.49.0");
}
if is_at_least_1_51 || is_nightly {
println!("cargo:rustc-cfg=has_min_const_generics");
}
if is_nightly {
println!("cargo:rustc-cfg=nightly");
}
}

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// A simple doubly linked list example using slotmap.
use slotmap::{new_key_type, Key, SlotMap};
new_key_type! {
pub struct ListKey;
}
#[derive(Copy, Clone)]
struct Node<T> {
value: T,
prev: ListKey,
next: ListKey,
}
pub struct List<T> {
sm: SlotMap<ListKey, Node<T>>,
head: ListKey,
tail: ListKey,
}
impl<T> List<T> {
pub fn new() -> Self {
Self {
sm: SlotMap::with_key(),
head: ListKey::null(),
tail: ListKey::null(),
}
}
pub fn len(&self) -> usize {
self.sm.len()
}
pub fn push_head(&mut self, value: T) -> ListKey {
let k = self.sm.insert(Node {
value,
prev: ListKey::null(),
next: self.head,
});
if let Some(old_head) = self.sm.get_mut(self.head) {
old_head.prev = k;
} else {
self.tail = k;
}
self.head = k;
k
}
pub fn push_tail(&mut self, value: T) -> ListKey {
let k = self.sm.insert(Node {
value,
prev: self.tail,
next: ListKey::null(),
});
if let Some(old_tail) = self.sm.get_mut(self.tail) {
old_tail.next = k;
} else {
self.head = k;
}
self.tail = k;
k
}
pub fn pop_head(&mut self) -> Option<T> {
self.sm.remove(self.head).map(|old_head| {
self.head = old_head.next;
old_head.value
})
}
pub fn pop_tail(&mut self) -> Option<T> {
self.sm.remove(self.tail).map(|old_tail| {
self.tail = old_tail.prev;
old_tail.value
})
}
pub fn remove(&mut self, key: ListKey) -> Option<T> {
self.sm.remove(key).map(|node| {
if let Some(prev_node) = self.sm.get_mut(node.prev) {
prev_node.next = node.next;
} else {
self.head = node.next;
}
if let Some(next_node) = self.sm.get_mut(node.next) {
next_node.prev = node.prev;
} else {
self.tail = node.prev;
}
node.value
})
}
pub fn head(&self) -> ListKey {
self.head
}
pub fn tail(&self) -> ListKey {
self.tail
}
pub fn get(&self, key: ListKey) -> Option<&T> {
self.sm.get(key).map(|node| &node.value)
}
pub fn get_mut(&mut self, key: ListKey) -> Option<&mut T> {
self.sm.get_mut(key).map(|node| &mut node.value)
}
}
fn main() {
let mut dll = List::new();
dll.push_head(5);
dll.push_tail(6);
let k = dll.push_head(3);
dll.push_tail(7);
dll.push_head(4);
assert_eq!(dll.len(), 4);
assert_eq!(dll.pop_head(), Some(4));
assert_eq!(dll.pop_head(), Some(5));
assert_eq!(dll.head(), k);
dll.push_head(10);
assert_eq!(dll.remove(k), Some(3));
assert_eq!(dll.pop_tail(), Some(7));
assert_eq!(dll.pop_tail(), Some(6));
assert_eq!(dll.pop_head(), Some(10));
assert_eq!(dll.pop_head(), None);
assert_eq!(dll.pop_tail(), None);
}

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// Randomized meldable heap.
// https://en.wikipedia.org/wiki/Randomized_meldable_heap
use slotmap::{new_key_type, Key, SlotMap};
new_key_type! {
struct HeapKey;
}
#[derive(Copy, Clone)]
struct NodeHandle(HeapKey);
#[derive(Copy, Clone)]
struct Node<T> {
value: T,
children: [HeapKey; 2],
parent: HeapKey,
}
struct RandMeldHeap<T: Ord> {
sm: SlotMap<HeapKey, Node<T>>,
rng: std::num::Wrapping<u32>,
root: HeapKey,
}
impl<T: Ord + std::fmt::Debug> RandMeldHeap<T> {
pub fn new() -> Self {
Self {
sm: SlotMap::with_key(),
rng: std::num::Wrapping(0xdead_beef),
root: HeapKey::null(),
}
}
pub fn coinflip(&mut self) -> bool {
// Simple LCG for top speed - random quality barely matters.
self.rng += (self.rng << 8) + std::num::Wrapping(1);
self.rng >> 31 > std::num::Wrapping(0)
}
pub fn insert(&mut self, value: T) -> NodeHandle {
let k = self.sm.insert(Node {
value,
children: [HeapKey::null(), HeapKey::null()],
parent: HeapKey::null(),
});
let root = self.root;
self.root = self.meld(k, root);
NodeHandle(k)
}
pub fn pop(&mut self) -> Option<T> {
self.sm.remove(self.root).map(|root| {
self.root = self.meld(root.children[0], root.children[1]);
if let Some(new_root) = self.sm.get_mut(self.root) {
new_root.parent = HeapKey::null();
}
root.value
})
}
pub fn remove_key(&mut self, node: NodeHandle) -> T {
let node = node.0;
self.unlink_node(node);
self.sm.remove(node).unwrap().value
}
pub fn update_key(&mut self, node: NodeHandle, value: T) {
let node = node.0;
// Unlink and re-insert.
self.unlink_node(node);
self.sm[node] = Node {
value,
children: [HeapKey::null(), HeapKey::null()],
parent: HeapKey::null(),
};
let root = self.root;
self.root = self.meld(node, root);
}
fn unlink_node(&mut self, node: HeapKey) {
// Remove node from heap by merging children and placing them where
// node used to be.
let children = self.sm[node].children;
let parent_key = self.sm[node].parent;
let melded_children = self.meld(children[0], children[1]);
if let Some(mc) = self.sm.get_mut(melded_children) {
mc.parent = parent_key;
}
if let Some(parent) = self.sm.get_mut(parent_key) {
if parent.children[0] == node {
parent.children[0] = melded_children;
} else {
parent.children[1] = melded_children;
}
} else {
self.root = melded_children;
}
}
fn meld(&mut self, mut a: HeapKey, mut b: HeapKey) -> HeapKey {
if a.is_null() {
return b;
}
if b.is_null() {
return a;
}
if self.sm[a].value > self.sm[b].value {
std::mem::swap(&mut a, &mut b);
}
let ret = a;
// From this point parent and trickle are assumed to be valid keys.
let mut parent = a;
let mut trickle = b;
loop {
// If a child spot is free, put our trickle there.
let children = self.sm[parent].children;
if children[0].is_null() {
self.sm[parent].children[0] = trickle;
self.sm[trickle].parent = parent;
break;
} else if children[1].is_null() {
self.sm[parent].children[1] = trickle;
self.sm[trickle].parent = parent;
break;
}
// No spot free, choose a random child.
let c = self.coinflip() as usize;
let child = children[c];
if self.sm[child].value > self.sm[trickle].value {
self.sm[parent].children[c] = trickle;
self.sm[trickle].parent = parent;
parent = trickle;
trickle = child;
} else {
parent = child;
}
}
ret
}
pub fn len(&self) -> usize {
self.sm.len()
}
}
fn main() {
let mut rhm = RandMeldHeap::new();
let the_answer = rhm.insert(-2);
let big = rhm.insert(999);
for k in (0..10).rev() {
rhm.insert(k * k);
}
rhm.update_key(the_answer, 42);
rhm.remove_key(big);
while rhm.len() > 0 {
println!("{}", rhm.pop().unwrap());
}
}

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#![doc(html_root_url = "https://docs.rs/slotmap/1.0.7")]
#![crate_name = "slotmap"]
#![cfg_attr(all(nightly, feature = "unstable"), feature(try_reserve))]
#![cfg_attr(all(not(test), not(feature = "std")), no_std)]
#![cfg_attr(all(nightly, doc), feature(doc_cfg))]
#![warn(
missing_debug_implementations,
trivial_casts,
trivial_numeric_casts,
unused_lifetimes,
unused_import_braces
)]
#![deny(missing_docs, unaligned_references)]
#![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
#![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]
#![cfg_attr(
feature = "cargo-clippy",
allow(
// Style differences.
module_name_repetitions,
redundant_closure_for_method_calls,
unseparated_literal_suffix,
// I know what I'm doing and want these.
wildcard_imports,
inline_always,
cast_possible_truncation,
needless_pass_by_value,
// Very noisy.
missing_errors_doc,
must_use_candidate
))]
//! # slotmap
//!
//! This library provides a container with persistent unique keys to access
//! stored values, [`SlotMap`]. Upon insertion a key is returned that can be
//! used to later access or remove the values. Insertion, removal and access all
//! take O(1) time with low overhead. Great for storing collections of objects
//! that need stable, safe references but have no clear ownership otherwise,
//! such as game entities or graph nodes.
//!
//! The difference between a [`BTreeMap`] or [`HashMap`] and a slot map is
//! that the slot map generates and returns the key when inserting a value. A
//! key is always unique and will only refer to the value that was inserted.
//! A slot map's main purpose is to simply own things in a safe and efficient
//! manner.
//!
//! You can also create (multiple) secondary maps that can map the keys returned
//! by [`SlotMap`] to other values, to associate arbitrary data with objects
//! stored in slot maps, without hashing required - it's direct indexing under
//! the hood.
//!
//! The minimum required stable Rust version for this crate is 1.49.
//!
//! # Examples
//!
//! ```
//! # use slotmap::*;
//! let mut sm = SlotMap::new();
//! let foo = sm.insert("foo"); // Key generated on insert.
//! let bar = sm.insert("bar");
//! assert_eq!(sm[foo], "foo");
//! assert_eq!(sm[bar], "bar");
//!
//! sm.remove(bar);
//! let reuse = sm.insert("reuse"); // Space from bar reused.
//! assert_eq!(sm.contains_key(bar), false); // After deletion a key stays invalid.
//!
//! let mut sec = SecondaryMap::new();
//! sec.insert(foo, "noun"); // We provide the key for secondary maps.
//! sec.insert(reuse, "verb");
//!
//! for (key, val) in sm {
//! println!("{} is a {}", val, sec[key]);
//! }
//! ```
//!
//! # Serialization through [`serde`], [`no_std`] support and unstable features
//!
//! Both keys and the slot maps have full (de)seralization support through
//! the [`serde`] library. A key remains valid for a slot map even after one or
//! both have been serialized and deserialized! This makes storing or
//! transferring complicated referential structures and graphs a breeze. Care has
//! been taken such that deserializing keys and slot maps from untrusted sources
//! is safe. If you wish to use these features you must enable the `serde`
//! feature flag for `slotmap` in your `Cargo.toml`.
//!
//! ```text
//! slotmap = { version = "1.0", features = ["serde"] }
//! ```
//!
//! This crate also supports [`no_std`] environments, but does require the
//! [`alloc`] crate to be available. To enable this you have to disable the
//! `std` feature that is enabled by default:
//!
//! ```text
//! slotmap = { version = "1.0", default-features = false }
//! ```
//!
//! Unfortunately [`SparseSecondaryMap`] is not available in [`no_std`], because
//! it relies on [`HashMap`]. Finally the `unstable` feature can be defined to
//! enable the parts of `slotmap` that only work on nightly Rust.
//!
//! # Why not index a [`Vec`], or use [`slab`], [`stable-vec`], etc?
//!
//! Those solutions either can not reclaim memory from deleted elements or
//! suffer from the ABA problem. The keys returned by `slotmap` are versioned.
//! This means that once a key is removed, it stays removed, even if the
//! physical storage inside the slotmap is reused for new elements. The key is a
//! permanently unique<sup>*</sup> reference to the inserted value. Despite
//! supporting versioning, a [`SlotMap`] is often not (much) slower than the
//! alternative, by internally using carefully checked unsafe code. Finally,
//! `slotmap` simply has a lot of features that make your life easy.
//!
//! # Performance characteristics and implementation details
//!
//! Insertion, access and deletion is all O(1) with low overhead by storing the
//! elements inside a [`Vec`]. Unlike references or indices into a vector,
//! unless you remove a key it is never invalidated. Behind the scenes each
//! slot in the vector is a `(value, version)` tuple. After insertion the
//! returned key also contains a version. Only when the stored version and
//! version in a key match is a key valid. This allows us to reuse space in the
//! vector after deletion without letting removed keys point to spurious new
//! elements. <sup>*</sup>After 2<sup>31</sup> deletions and insertions to the
//! same underlying slot the version wraps around and such a spurious reference
//! could potentially occur. It is incredibly unlikely however, and in all
//! circumstances is the behavior safe. A slot map can hold up to
//! 2<sup>32</sup> - 2 elements at a time.
//!
//! The memory usage for each slot in [`SlotMap`] is `4 + max(sizeof(T), 4)`
//! rounded up to the alignment of `T`. Similarly it is `4 + max(sizeof(T), 12)`
//! for [`HopSlotMap`]. [`DenseSlotMap`] has an overhead of 8 bytes per element
//! and 8 bytes per slot.
//!
//! # Choosing [`SlotMap`], [`HopSlotMap`] or [`DenseSlotMap`]
//!
//! A [`SlotMap`] is the fastest for most operations, except iteration. It can
//! never shrink the size of its underlying storage, because it must remember
//! for each storage slot what the latest stored version was, even if the slot
//! is empty now. This means that iteration can be slow as it must iterate over
//! potentially a lot of empty slots.
//!
//! [`HopSlotMap`] solves this by maintaining more information on
//! insertion/removal, allowing it to iterate only over filled slots by 'hopping
//! over' contiguous blocks of vacant slots. This can give it significantly
//! better iteration speed. If you expect to iterate over all elements in a
//! [`SlotMap`] a lot, and potentially have a lot of deleted elements, choose
//! [`HopSlotMap`]. The downside is that insertion and removal is roughly twice
//! as slow. Random access is the same speed for both.
//!
//! [`DenseSlotMap`] goes even further and stores all elements on a contiguous
//! block of memory. It uses two indirections per random access; the slots
//! contain indices used to access the contiguous memory. This means random
//! access is slower than both [`SlotMap`] and [`HopSlotMap`], but iteration is
//! significantly faster, as fast as a normal [`Vec`].
//!
//! # Choosing [`SecondaryMap`] or [`SparseSecondaryMap`]
//!
//! You want to associate extra data with objects stored in a slot map, so you
//! use (multiple) secondary maps to map keys to that data.
//!
//! A [`SecondaryMap`] is simply a [`Vec`] of slots like slot map is, and
//! essentially provides all the same guarantees as [`SlotMap`] does for its
//! operations (with the exception that you provide the keys as produced by the
//! primary slot map). This does mean that even if you associate data to only
//! a single element from the primary slot map, you could need and have to
//! initialize as much memory as the original.
//!
//! A [`SparseSecondaryMap`] is like a [`HashMap`] from keys to objects, however
//! it automatically removes outdated keys for slots that had their space
//! reused. You should use this variant if you expect to store some associated
//! data for only a small portion of the primary slot map.
//!
//! # Custom key types
//!
//! If you have multiple slot maps it's an error to use the key of one slot map
//! on another slot map. The result is safe, but unspecified, and can not be
//! detected at runtime, so it can lead to a hard to find bug.
//!
//! To prevent this, slot maps allow you to specify what the type is of the key
//! they return. You can construct new key types using the [`new_key_type!`]
//! macro. The resulting type behaves exactly like [`DefaultKey`], but is a
//! distinct type. So instead of simply using `SlotMap<DefaultKey, Player>` you
//! would use:
//!
//! ```
//! # use slotmap::*;
//! # #[derive(Copy, Clone)]
//! # struct Player;
//! new_key_type! { struct PlayerKey; }
//! let sm: SlotMap<PlayerKey, Player> = SlotMap::with_key();
//! ```
//!
//! You can write code generic over any key type using the [`Key`] trait.
//!
//! [`Vec`]: std::vec::Vec
//! [`BTreeMap`]: std::collections::BTreeMap
//! [`HashMap`]: std::collections::HashMap
//! [`serde`]: https://github.com/serde-rs/serde
//! [`slab`]: https://crates.io/crates/slab
//! [`stable-vec`]: https://crates.io/crates/stable-vec
//! [`no_std`]: https://doc.rust-lang.org/1.7.0/book/no-stdlib.html
extern crate alloc;
// So our macros can refer to these.
#[doc(hidden)]
pub mod __impl {
#[cfg(feature = "serde")]
pub use serde::{Deserialize, Deserializer, Serialize, Serializer};
pub use core::convert::From;
pub use core::result::Result;
}
pub mod basic;
pub mod dense;
pub mod hop;
pub mod secondary;
#[cfg(feature = "std")]
pub mod sparse_secondary;
pub(crate) mod util;
use core::fmt::{self, Debug, Formatter};
use core::hash::{Hash, Hasher};
use core::num::NonZeroU32;
#[doc(inline)]
pub use crate::basic::SlotMap;
#[doc(inline)]
pub use crate::dense::DenseSlotMap;
#[doc(inline)]
pub use crate::hop::HopSlotMap;
#[doc(inline)]
pub use crate::secondary::SecondaryMap;
#[cfg(feature = "std")]
#[doc(inline)]
pub use crate::sparse_secondary::SparseSecondaryMap;
// Keep Slottable for backwards compatibility, but warn about deprecation
// and hide from documentation.
#[doc(hidden)]
#[deprecated(
since = "1.0.0",
note = "Slottable is not necessary anymore, slotmap now supports all types on stable."
)]
pub trait Slottable {}
#[doc(hidden)]
#[allow(deprecated)]
impl<T> Slottable for T {}
/// The actual data stored in a [`Key`].
///
/// This implements [`Ord`](std::cmp::Ord) so keys can be stored in e.g.
/// [`BTreeMap`](std::collections::BTreeMap), but the order of keys is
/// unspecified.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct KeyData {
idx: u32,
version: NonZeroU32,
}
impl KeyData {
fn new(idx: u32, version: u32) -> Self {
debug_assert!(version > 0);
Self {
idx,
version: unsafe { NonZeroU32::new_unchecked(version | 1) },
}
}
fn null() -> Self {
Self::new(core::u32::MAX, 1)
}
fn is_null(self) -> bool {
self.idx == core::u32::MAX
}
/// Returns the key data as a 64-bit integer. No guarantees about its value
/// are made other than that passing it to [`from_ffi`](Self::from_ffi)
/// will return a key equal to the original.
///
/// With this you can easily pass slot map keys as opaque handles to foreign
/// code. After you get them back you can confidently use them in your slot
/// map without worrying about unsafe behavior as you would with passing and
/// receiving back references or pointers.
///
/// This is not a substitute for proper serialization, use [`serde`] for
/// that. If you are not doing FFI, you almost surely do not need this
/// function.
///
/// [`serde`]: crate#serialization-through-serde-no_std-support-and-unstable-features
pub fn as_ffi(self) -> u64 {
(u64::from(self.version.get()) << 32) | u64::from(self.idx)
}
/// Iff `value` is a value received from `k.as_ffi()`, returns a key equal
/// to `k`. Otherwise the behavior is safe but unspecified.
pub fn from_ffi(value: u64) -> Self {
let idx = value & 0xffff_ffff;
let version = (value >> 32) | 1; // Ensure version is odd.
Self::new(idx as u32, version as u32)
}
}
impl Debug for KeyData {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{}v{}", self.idx, self.version.get())
}
}
impl Default for KeyData {
fn default() -> Self {
Self::null()
}
}
impl Hash for KeyData
{
fn hash<H: Hasher>(&self, state: &mut H) {
// A derived Hash impl would call write_u32 twice. We call write_u64
// once, which is beneficial if the hasher implements write_u64
// explicitly.
state.write_u64(self.as_ffi())
}
}
/// Key used to access stored values in a slot map.
///
/// Do not use a key from one slot map in another. The behavior is safe but
/// non-sensical (and might panic in case of out-of-bounds).
///
/// To prevent this, it is suggested to have a unique key type for each slot
/// map. You can create new key types using [`new_key_type!`], which makes a
/// new type identical to [`DefaultKey`], just with a different name.
///
/// This trait is intended to be a thin wrapper around [`KeyData`], and all
/// methods must behave exactly as if we're operating on a [`KeyData`] directly.
/// The internal unsafe code relies on this, therefore this trait is `unsafe` to
/// implement. It is strongly suggested to simply use [`new_key_type!`] instead
/// of implementing this trait yourself.
pub unsafe trait Key:
From<KeyData>
+ Copy
+ Clone
+ Default
+ Eq
+ PartialEq
+ Ord
+ PartialOrd
+ core::hash::Hash
+ core::fmt::Debug
{
/// Creates a new key that is always invalid and distinct from any non-null
/// key. A null key can only be created through this method (or default
/// initialization of keys made with [`new_key_type!`], which calls this
/// method).
///
/// A null key is always invalid, but an invalid key (that is, a key that
/// has been removed from the slot map) does not become a null key. A null
/// is safe to use with any safe method of any slot map instance.
///
/// # Examples
///
/// ```
/// # use slotmap::*;
/// let mut sm = SlotMap::new();
/// let k = sm.insert(42);
/// let nk = DefaultKey::null();
/// assert!(nk.is_null());
/// assert!(k != nk);
/// assert_eq!(sm.get(nk), None);
/// ```
fn null() -> Self {
KeyData::null().into()
}
/// Checks if a key is null. There is only a single null key, that is
/// `a.is_null() && b.is_null()` implies `a == b`.
///
/// # Examples
///
/// ```
/// # use slotmap::*;
/// new_key_type! { struct MyKey; }
/// let a = MyKey::null();
/// let b = MyKey::default();
/// assert_eq!(a, b);
/// assert!(a.is_null());
/// ```
fn is_null(&self) -> bool {
self.data().is_null()
}
/// Gets the [`KeyData`] stored in this key.
///
/// # Examples
///
/// ```
/// # use slotmap::*;
/// new_key_type! { struct MyKey; }
/// let dk = DefaultKey::null();
/// let mk = MyKey::null();
/// assert_eq!(dk.data(), mk.data());
/// ```
fn data(&self) -> KeyData;
}
/// A helper macro to create new key types. If you use a new key type for each
/// slot map you create you can entirely prevent using the wrong key on the
/// wrong slot map.
///
/// The type constructed by this macro is defined exactly as [`DefaultKey`],
/// but is a distinct type for the type checker and does not implicitly convert.
///
/// # Examples
///
/// ```
/// # extern crate slotmap;
/// # use slotmap::*;
/// new_key_type! {
/// // A private key type.
/// struct RocketKey;
///
/// // A public key type with a doc comment.
/// /// Key for the user slot map.
/// pub struct UserKey;
/// }
///
/// fn main() {
/// let mut users = SlotMap::with_key();
/// let mut rockets = SlotMap::with_key();
/// let bob: UserKey = users.insert("bobby");
/// let apollo: RocketKey = rockets.insert("apollo");
/// // Now this is a type error because rockets.get expects an RocketKey:
/// // rockets.get(bob);
///
/// // If for some reason you do end up needing to convert (e.g. storing
/// // keys of multiple slot maps in the same data structure without
/// // boxing), you can use KeyData as an intermediate representation. This
/// // does mean that once again you are responsible for not using the wrong
/// // key on the wrong slot map.
/// let keys = vec![bob.data(), apollo.data()];
/// println!("{} likes rocket {}",
/// users[keys[0].into()], rockets[keys[1].into()]);
/// }
/// ```
#[macro_export(local_inner_macros)]
macro_rules! new_key_type {
( $(#[$outer:meta])* $vis:vis struct $name:ident; $($rest:tt)* ) => {
$(#[$outer])*
#[derive(Copy, Clone, Default,
Eq, PartialEq, Ord, PartialOrd,
Hash, Debug)]
#[repr(transparent)]
$vis struct $name($crate::KeyData);
impl $crate::__impl::From<$crate::KeyData> for $name {
fn from(k: $crate::KeyData) -> Self {
$name(k)
}
}
unsafe impl $crate::Key for $name {
fn data(&self) -> $crate::KeyData {
self.0
}
}
$crate::__serialize_key!($name);
$crate::new_key_type!($($rest)*);
};
() => {}
}
#[cfg(feature = "serde")]
#[doc(hidden)]
#[macro_export]
macro_rules! __serialize_key {
( $name:ty ) => {
impl $crate::__impl::Serialize for $name {
fn serialize<S>(&self, serializer: S) -> $crate::__impl::Result<S::Ok, S::Error>
where
S: $crate::__impl::Serializer,
{
$crate::Key::data(self).serialize(serializer)
}
}
impl<'de> $crate::__impl::Deserialize<'de> for $name {
fn deserialize<D>(deserializer: D) -> $crate::__impl::Result<Self, D::Error>
where
D: $crate::__impl::Deserializer<'de>,
{
let key_data: $crate::KeyData =
$crate::__impl::Deserialize::deserialize(deserializer)?;
Ok(key_data.into())
}
}
};
}
#[cfg(not(feature = "serde"))]
#[doc(hidden)]
#[macro_export]
macro_rules! __serialize_key {
( $name:ty ) => {};
}
new_key_type! {
/// The default slot map key type.
pub struct DefaultKey;
}
// Serialization with serde.
#[cfg(feature = "serde")]
mod serialize {
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use super::*;
#[derive(Serialize, Deserialize)]
pub struct SerKey {
idx: u32,
version: u32,
}
impl Serialize for KeyData {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let ser_key = SerKey {
idx: self.idx,
version: self.version.get(),
};
ser_key.serialize(serializer)
}
}
impl<'de> Deserialize<'de> for KeyData {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let mut ser_key: SerKey = Deserialize::deserialize(deserializer)?;
// Ensure a.is_null() && b.is_null() implies a == b.
if ser_key.idx == core::u32::MAX {
ser_key.version = 1;
}
ser_key.version |= 1; // Ensure version is odd.
Ok(Self::new(ser_key.idx, ser_key.version))
}
}
}
#[cfg(test)]
mod tests {
// Intentionally no `use super::*;` because we want to test macro expansion
// in the *users* scope, which might not have that.
#[test]
fn macro_expansion() {
#![allow(dead_code)]
use super::new_key_type;
// Clobber namespace with clashing names - should still work.
trait Serialize { }
trait Deserialize { }
trait Serializer { }
trait Deserializer { }
trait Key { }
trait From { }
struct Result;
struct KeyData;
new_key_type! {
struct A;
pub(crate) struct B;
pub struct C;
}
}
#[test]
fn check_is_older_version() {
use super::util::is_older_version;
let is_older = |a, b| is_older_version(a, b);
assert!(!is_older(42, 42));
assert!(is_older(0, 1));
assert!(is_older(0, 1 << 31));
assert!(!is_older(0, (1 << 31) + 1));
assert!(is_older(u32::MAX, 0));
}
#[test]
fn iters_cloneable() {
use super::*;
struct NoClone;
let mut sm = SlotMap::new();
let mut hsm = HopSlotMap::new();
let mut dsm = DenseSlotMap::new();
let mut scm = SecondaryMap::new();
let mut sscm = SparseSecondaryMap::new();
scm.insert(sm.insert(NoClone), NoClone);
sscm.insert(hsm.insert(NoClone), NoClone);
dsm.insert(NoClone);
let _ = sm.keys().clone();
let _ = sm.values().clone();
let _ = sm.iter().clone();
let _ = hsm.keys().clone();
let _ = hsm.values().clone();
let _ = hsm.iter().clone();
let _ = dsm.keys().clone();
let _ = dsm.values().clone();
let _ = dsm.iter().clone();
let _ = scm.keys().clone();
let _ = scm.values().clone();
let _ = scm.iter().clone();
let _ = sscm.keys().clone();
let _ = sscm.values().clone();
let _ = sscm.iter().clone();
}
#[cfg(feature = "serde")]
#[test]
fn key_serde() {
use super::*;
// Check round-trip through serde.
let mut sm = SlotMap::new();
let k = sm.insert(42);
let ser = serde_json::to_string(&k).unwrap();
let de: DefaultKey = serde_json::from_str(&ser).unwrap();
assert_eq!(k, de);
// Even if a malicious entity sends up even (unoccupied) versions in the
// key, we make the version point to the occupied version.
let malicious: KeyData = serde_json::from_str(&r#"{"idx":0,"version":4}"#).unwrap();
assert_eq!(malicious.version.get(), 5);
}
}

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use core::fmt::Debug;
use core::hint::unreachable_unchecked;
/// Internal stable replacement for !.
#[derive(Debug)]
pub enum Never {}
/// Returns if a is an older version than b, taking into account wrapping of
/// versions.
pub fn is_older_version(a: u32, b: u32) -> bool {
let diff = a.wrapping_sub(b);
diff >= (1 << 31)
}
/// An unwrapper that checks on debug, doesn't check on release.
/// UB if unwrapped on release mode when unwrap would panic.
pub trait UnwrapUnchecked<T> {
// Extra underscore because unwrap_unchecked is planned to be added to the stdlib.
unsafe fn unwrap_unchecked_(self) -> T;
}
impl<T> UnwrapUnchecked<T> for Option<T> {
unsafe fn unwrap_unchecked_(self) -> T {
if cfg!(debug_assertions) {
self.unwrap()
} else {
match self {
Some(x) => x,
None => unreachable_unchecked(),
}
}
}
}
impl<T, E: Debug> UnwrapUnchecked<T> for Result<T, E> {
unsafe fn unwrap_unchecked_(self) -> T {
if cfg!(debug_assertions) {
self.unwrap()
} else {
match self {
Ok(x) => x,
Err(_) => unreachable_unchecked(),
}
}
}
}