rustHow to use an async Rust HashMap?
An async Rust HashMap is a concurrent data structure that allows multiple threads to access and modify the same data without blocking each other. It is a type of concurrent hash table that is optimized for concurrent access.
Example code
use async_std::sync::{Arc, RwLock};
let map = Arc::new(RwLock::new(HashMap::new()));
// Insert a key-value pair
map.write().await.insert("key", "value");
// Get a value
let value = map.read().await.get("key");
Output example
Some("value")
Code explanation
-
use async_std::sync::{Arc, RwLock};
: This imports the Arc and RwLock modules from the async_std library, which are used to create a thread-safe reference-counted pointer and a read-write lock respectively. -
let map = Arc::new(RwLock::new(HashMap::new()));
: This creates a new thread-safe reference-counted pointer to a new empty HashMap. -
map.write().await.insert("key", "value");
: This acquires a write lock on the HashMap and inserts a key-value pair. -
let value = map.read().await.get("key");
: This acquires a read lock on the HashMap and retrieves the value associated with the given key.
Helpful links
Related
- How to use a HashBrown with a Rust HashMap?
- How to implement PartialEq for a Rust HashMap?
- How to create a new Rust HashMap with values?
- How to create a Rust HashMap with a string key?
- How to use a Rust HashMap in a multithreaded environment?
- How to use a tuple as a key in a Rust HashMap?
- How to get the length of a Rust HashMap?
- How to create a HashMap of HashMaps in Rust?
- How to create a new Rust HashMap with a specific type?
- How to create a HashMap of traits in Rust?
More of Rust
- How to match whitespace with a regex in Rust?
- How to match a URL with a regex in Rust?
- How to convert a Rust HashMap to a BTreeMap?
- How to use a HashBrown with a Rust HashMap?
- How to use Unicode in a regex in Rust?
- How to split a string with Rust regex?
- How to use non-capturing groups in Rust regex?
- Regex example to match multiline string in Rust?
- How to use regex lookahead in Rust?
- How to ignore case in Rust regex?
See more codes...