Struct orx_split_vec::Doubling

pub struct Doubling;

Stategy which allows creates a fragment with double the capacity of the prior fragment every time the split vector needs to expand.

Assuming it is the common case compared to empty vector scenarios, it immediately allocates the first fragment to keep the SplitVec struct smaller.

Examples

use orx_split_vec::prelude::*;

// SplitVec<usize, DoublingGrowth>
let mut vec = SplitVec::with_doubling_growth();

assert_eq!(1, vec.fragments().len());
assert_eq!(Some(4), vec.fragments().first().map(|f| f.capacity()));
assert_eq!(Some(0), vec.fragments().first().map(|f| f.len()));

// fill the first 5 fragments
let expected_fragment_capacities = vec![4, 8, 16, 32];
let num_items: usize = expected_fragment_capacities.iter().sum();
for i in 0..num_items {
    vec.push(i);
}

assert_eq!(
    expected_fragment_capacities,
    vec.fragments()
    .iter()
    .map(|f| f.capacity())
    .collect::<Vec<_>>()
);
assert_eq!(
    expected_fragment_capacities,
    vec.fragments().iter().map(|f| f.len()).collect::<Vec<_>>()
);

// create the 6-th fragment doubling the capacity
vec.push(42);
assert_eq!(
    vec.fragments().len(),
    expected_fragment_capacities.len() + 1
);

assert_eq!(vec.fragments().last().map(|f| f.capacity()), Some(32 * 2));
assert_eq!(vec.fragments().last().map(|f| f.len()), Some(1));

Trait Implementations

impl Clone for Doubling

fn clone(&self) -> Doubling

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Doubling

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Doubling

fn default() -> Doubling

Returns the “default value” for a type.

impl Growth for Doubling

fn new_fragment_capacity<T>(&self, fragments: &[Fragment<T>]) -> usize

Given that the split vector contains the given fragments, returns the capacity of the next fragment.

fn get_fragment_and_inner_indices<T>( &self, vec_len: usize, _fragments: &[Fragment<T>], element_index: usize ) -> Option<(usize, usize)>

Returns the location of the element with the given element_index on the split vector as a tuple of (fragment-index, index-within-fragment).

impl PartialEq for Doubling

fn eq(&self, other: &Doubling) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Doubling