Trait Reserve 

pub trait Reserve: Default {
    // Provided method
    fn reserve(_: usize) -> Self { ... }
}

Create a data structure and reserve some amount of space for it to grow into

Examples

• Vec is Reserve, and invokes Vec::with_capacity
• tinyvec::ArrayVec is Reserve and invokes Default::default() because creating an ArrayVec automatically allocates the required space on the stack.

Provided Methods

fn reserve(_: usize) -> Self

Create an instance of the collection with a given capacity.

Used to reserve some contiguous space, e.g. Vec::with_capacity

The default implementation invokes Default::default

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<A: Array> Reserve for ArrayVec<A>

impl<K, V> Reserve for BTreeMap<K, V>

Available on crate feature alloc only.

impl<K: Eq + Hash, V> Reserve for HashMap<K, V>

Available on crate feature std only.

fn reserve(n: usize) -> Self

impl<T> Reserve for Vec<T>

Available on crate feature alloc only.

fn reserve(n: usize) -> Self

Implementors