This crate defines Structs: Set, OrderedSet, IndexedSet, RankedSet and methods acting on them. These Structs are type-safe wrappers for the more primitive imported functions and methods from crate indxvec.
The main capabilities of sets include: efficient sorting, ranking, merging, searching and indices manipulations. These methods work with generic vectors or slices of primitive end types. They will also work with any arbitrarily complex user end type, as long as the required traits PartialOrd and Copy, are implemented for it (by the user).
Insert into your Cargo.toml file [dependencies] section: sets = "^1"
Import into your source file(s) the four Structs for the four different types of sets and the two traits SetOps and MutSetOps. The following 'use' declaration imports everything:
rust
use sets::{Set,OrderedSet,IndexedSet,RankedSet,SetOps,MutSetOps};
from_slice(), from_set(), from_indexed, from_ranked
Initialisers and converters are associated with their type Structs, hence the :: syntax is necessary, e.g.:
rust
// Unordered set from slice v
let s = Set::from_slice(&v);
// Automatically creates a descending sort index for v
let si = IndexedSet::from_slice(&v,false);
Example use of methods from the traits SetOps, and MutSetOps:
rust
// Mutable set su with unique elements from s
let mut su = s.nonrepeat();
// su mutated-reversed into the opposite order
su.mreverse;
It is highly recommended to read and run tests/tests.rs for many more examples of usage. Use a single thread to run them. It may be a bit slower but it will write the results in the right order:
bash
cargo test --release -- --test-threads=1 --nocapture --color always
Implements the following methods for all four types of sets (Structs):
rust
pub trait SetOps<T> {
/// reverses the vector of explicit sets and index of indexed sets
fn reverse(&self) -> Self;
/// Deletes any repetitions
fn nonrepeat(&self) -> Self;
/// Finds minimum, its first index, maximum, its first index
fn infsup(&self) -> MinMax<T>;
/// True if m is a member of the set
fn member(&self, m: T) -> bool;
/// Some(index) of the first item found, or None.
fn search(&self, m: T) -> Option<usize>;
/// Union of two sets of the same type
fn union(&self, s: &Self) -> Self;
/// Intersection of two sets of the same type
fn intersection(&self, s: &Self) -> OrderedSet<T>;
/// Removing s from self (i.e. self-s)
fn difference(&self, s: &Self) -> OrderedSet<T>;
}
Some of these methods are more efficient for the ordered and indexed sets, rather than for the unordered sets. For example, member and search are then able to use binary search. Union is like the classical merge but only one copy of items that were present in both input sets is kept. To remove repetitions from a single set at any other time, use nonrepeat.
intersection and difference, when applied to IndexedSet(s) and RankedSet(s) return an OrderedSet as a result. This result can be explicitly converted to other types of sets when needed.
Union returns the same type as the one to which it is applied. Thus, for example, union of two (unordered) Sets will produce another unordered Set (just their concatenation).
Here 'm' in the methods' names stands for 'mutable'. They overwrite the mutable set to which they are applied with the result. Thus they are not functional but in the context of handling large vectors, they are often simpler and more efficient. At the price of destroying the previous contents of self, of course.
Implements the following methods for all four types of sets:
rust
pub trait MutSetOps<T> {
/// Deletes an item of the same end-type from self
fn mdelete(&mut self, item:T) -> bool;
/// Inserts an item of the same end-type to self
fn minsert(&mut self, item:T);
/// reverses the explicit sets, or index of indexed sets
fn mreverse(&mut self);
/// Deletes any repetitions
fn mnonrepeat(&mut self);
/// Union of two sets of the same type
fn munion(&mut self, s: &Self);
/// Intersection of two sets of the same type
fn mintersection(&mut self, s: &Self);
/// Removing s from self (i.e. self-s)
fn mdifference(&mut self, s: &Self);
}
Version 1.0.6 - Added mutable methods minsert and mdelete to MutSetOps, that insert or remove one specific item to/from any of the sets. Added tests of them to tests/tests.rs. Updated indxvec dependency to its version 1.2.4 or greater.
Version 1.0.5 - Documentation improvements.
Version 1.0.4 - nonrepeat now always returns an OrderedSet. Clarified settest.
Version 1.0.3 - updated to be compatible with indxvec version 1.2.1. Improved munion.
Version 1.0.2 - some changes to printing to reflect changes to indxvec.
Version 1.0.1 - some tidying up of code, no changes of functionality.
Version 1.0.0 - stable version with some minor improvements to README.md (this document). Updated to indxvec = "^1" and Rust edition 2021.