memoize 0.6.0

Attribute macro for auto-memoizing functions with somewhat-simple signatures
Documentation 
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use memoize::memoize;
use std::thread;
use std::time::{Duration, Instant};

#[allow(dead_code)]
#[derive(Debug, Clone)]
struct ComplexStruct {
    s: String,
    b: bool,
    i: Instant,
}

#[cfg(feature = "full")]
#[memoize(TimeToLive: Duration::from_secs(2), Capacity: 123)]
fn hello(key: String) -> ComplexStruct {
    println!("hello: {}", key);
    ComplexStruct {
        s: key,
        b: false,
        i: Instant::now(),
    }
}

fn main() {
    #[cfg(feature = "full")]
    {
        println!("result: {:?}", hello("ABC".to_string()));
        println!("result: {:?}", hello("DEF".to_string()));
        println!("result: {:?}", hello("ABC".to_string())); // Same as first
        thread::sleep(core::time::Duration::from_millis(2100));
        println!("result: {:?}", hello("ABC".to_string()));
        println!("result: {:?}", hello("DEF".to_string()));
        println!("result: {:?}", hello("ABC".to_string())); // Same as first
        memoized_flush_hello();
        println!("result: {:?}", hello("EFG".to_string()));
        println!("result: {:?}", hello("ABC".to_string())); // Refreshed
        println!("result: {:?}", hello("EFG".to_string())); // Same as first
        println!("result: {:?}", hello("ABC".to_string())); // Same as refreshed
        println!("result: {:?}", memoized_original_hello("ABC".to_string()));
    }
}