Struct DataSet 

pub struct DataSet { /* private fields */ }

Collection of arbitrary data

This struct is used to store arbitrary data in the environment. Data stored in this struct are identified by their TypeId, so you cannot store multiple data instances of the same type.

Implementations

impl DataSet

pub fn new() -> Self

Creates a new empty DataSet.

pub fn insert<T: Clone + 'static>(&mut self, data: Box<T>) -> Option<Box<T>>

Inserts a new data into the DataSet.

If data of the same type is already stored in self, it is replaced. Returns the old data if it exists.

pub fn get<T: 'static>(&self) -> Option<&T>

Obtains a reference to the data of the specified type.

pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T>

Obtains a mutable reference to the data of the specified type.

pub fn get_or_insert_with<T, F>(&mut self, f: F) -> &mut T

where T: Clone + 'static, F: FnOnce() -> Box<T>,

Obtains a reference to the data of the specified type, or inserts a new data if it does not exist.

If the data does not exist, the data is created by calling the provided closure and inserted into the DataSet, and a reference to the data is returned. If the data already exists, a reference to the existing data is returned and the closure is not called.

pub fn remove<T: 'static>(&mut self) -> Option<Box<T>>

Removes the data of the specified type from the DataSet.

Returns the data if it exists.

Trait Implementations

impl Clone for DataSet

fn clone(&self) -> DataSet

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DataSet

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

Formats the value using the given formatter.

impl Default for DataSet

fn default() -> DataSet

Returns the “default value” for a type.