Struct DefaultVec

pub struct DefaultVec<T, I = usize>(/* private fields */);

A mapping from indexes to values where all indexes initially map to Default::default

It is stored in 2 usizes worth of memory since it doesn’t need to store the length.

It resizes its heap allocation whenever an element that wouldn’t otherwise fit in memory is added and doesn’t ever shrink its memory so it could end of wasting memory if an element is added with a large index and then removed

Implementations

impl<T: Default, I: Into<usize>> DefaultVec<T, I>

pub fn get_mut(&mut self, i: I) -> &mut T

Returns mutable access to the element at i

pub fn get(&self, i: I) -> T

where T: Copy,

Returns shared access to the element at i

pub fn clear(&mut self)

Resets all elements to there default value

pub fn capacity(&self) -> usize

pub fn iter(&self) -> Iter<'_, T>

Returns an iterator over the elements of this list the iterator will have capacity elements

pub fn iter_mut(&mut self) -> IterMut<'_, T>

Returns a mutable iterator over the elements of this list the iterator will have capacity elements

Trait Implementations

impl<T: Clone + Default, I: Into<usize>> Clone for DefaultVec<T, I>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug + Default, I: Into<usize>> Debug for DefaultVec<T, I>

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

Formats the value using the given formatter.

impl<T, I> Default for DefaultVec<T, I>

fn default() -> Self

Returns the “default value” for a type.

impl<T: ConstDefault, I: Into<usize>> Index<I> for DefaultVec<T, I>

type Output = T

The returned type after indexing.

fn index(&self, index: I) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<T: ConstDefault, I: Into<usize>> IndexMut<I> for DefaultVec<T, I>

fn index_mut(&mut self, index: I) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation.