Struct Counter

pub struct Counter(pub usize);

A Collection that only counts the final size of a set operation.

It is meant to be used to avoid unecessary allocations.

use sdset::duo::OpBuilder;
use sdset::{SetOperation, Set, SetBuf, Counter};

let a = Set::new(&[1, 2, 4, 6, 7])?;
let b = Set::new(&[2, 3, 4, 5, 6, 7])?;

let op = OpBuilder::new(a, b).union();

let mut counter = Counter::default();
SetOperation::<i32>::extend_collection(op, &mut counter);

assert_eq!(counter.0, 7);

Tuple Fields

0: usize

Implementations

impl Counter

pub fn new() -> Counter

Create a new Counter initialized with 0;

Trait Implementations

impl<T> Collection<T> for Counter

fn push(&mut self, _elem: T)

Insert one element into the collection.

fn extend_from_slice(&mut self, elems: &[T])

where T: Clone,

Extend the collection by cloning the elements.

fn extend<I>(&mut self, elems: I)

where I: IntoIterator<Item = T>,

Extend the collection by inserting the elements from the given Iterator.

fn reserve(&mut self, _size: usize)

Reserve enough space in the collection for size elements.

impl Default for Counter

fn default() -> Counter

Returns the “default value” for a type.