Struct FnMatcher 

pub struct FnMatcher<T, F>
where
    F: Fn(&T) -> bool,
{ /* private fields */ }

Function-based matcher for maximum flexibility in matching logic.

This matcher allows you to provide a custom function that determines whether a key matches. This is the most flexible matcher and can implement any matching logic you need.

Examples

use simple_cacher::*;
use std::time::Duration;

let mut cache = SimpleCacher::new(Duration::from_secs(300));
cache.insert(2, "Even number".to_string());
cache.insert(3, "Odd number".to_string());
cache.insert(4, "Even number".to_string());
cache.insert(5, "Odd number".to_string());

// Find even numbers
let even_matcher = FnMatcher::new(|&key: &i32| key % 2 == 0);
let even_numbers = cache.get_all_by_matcher(&even_matcher);
assert_eq!(even_numbers.len(), 2); // 2 and 4

Implementations

impl<T, F> FnMatcher<T, F>

where F: Fn(&T) -> bool,

pub fn new(matcher_fn: F) -> Self

Creates a new function-based matcher.

Arguments

• matcher_fn - A function that takes a key reference and returns true if it matches

Examples

use simple_cacher::*;

// Match strings longer than 5 characters
let long_string_matcher = FnMatcher::new(|s: &String| s.len() > 5);

Trait Implementations

impl<T, F> Matcher<T> for FnMatcher<T, F>

where F: Fn(&T) -> bool,

fn matches(&self, key: &T) -> bool

Returns true if the given key matches this matcher’s criteria.