timed-map

Lightweight map implementation that supports expiring entries and fully compatible with both std and no_std environments.

TimedMap allows storing key-value pairs with optional expiration times. Expiration is handled by an implementation of the Clock trait, which abstracts time handling for no_std environments.

When std feature is enabled (which is the default case), Clock trait is handled automatically from the crate internals with std::time::SystemTime.

Examples:

In std environments:

use timed_map::{TimedMap, StdClock};
use std::time::Duration;

let mut map: TimedMap<StdClock, _, _> = TimedMap::new();

map.insert_expirable(1, "expirable value", Duration::from_secs(60));
assert_eq!(map.get(&1), Some(&"expirable value"));
assert!(map.get_remaining_duration(&1).is_some());

map.insert_constant(2, "constant value");
assert_eq!(map.get(&2), Some(&"constant value"));
assert!(map.get_remaining_duration(&2).is_none());

In no_std environments:

use core::time::Duration;
use timed_map::{Clock, TimedMap};

struct CustomClock;

impl Clock for CustomClock {
    fn now_seconds(&self) -> u64 {
        // Custom time implementation depending on the hardware.
    }
}

let clock = CustomClock;
let mut map = TimedMap::new(clock);

map.insert_expirable(1, "expirable value", Duration::from_secs(60));
assert_eq!(map.get(&1), Some(&"expirable value"));
assert!(map.get_remaining_duration(&1).is_some());

map.insert_constant(2, "constant value");
assert_eq!(map.get(&2), Some(&"constant value"));
assert!(map.get_remaining_duration(&2).is_none());