Trait ContainerReserve 

pub trait ContainerReserve {
    // Required method
    fn reserve(&mut self, additional: usize);
}

A trait to reserve space in a container, in case you know how many values are about to enter and can avoid reallocations by reserving more space at once.

Required Methods

fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more elements to be inserted in the cache. The collection may reserve more space to avoid frequent reallocations.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<I, O, S> ContainerReserve for HashMap<I, O, S>

where I: Eq + Hash, S: BuildHasher,

fn reserve(&mut self, additional: usize)

Implementors