myest 0.1.0

nothing but funny
Documentation 
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use std::thread;
use std::time::Duration;

pub fn simulated_expensive_calculation(intensity: u32) -> u32{
    println!("calculating slowly...");
    thread::sleep(Duration::from_secs(2));
    intensity
}

pub struct Cacher<T>
    where T: Fn(u32) -> u32
{
    calculation: T,
    value: Option<u32>,
}

impl<T> Cacher<T>
    where T: Fn(u32) -> u32
{
    pub fn new(calculation: T) -> Cacher<T>{
        Cacher { calculation, value: None, }
    }

    pub fn value(&mut self, arg: u32) -> u32{
        match self.value {
            Some(v) => v,
            None => {
                let v = (self.calculation)(arg);
                self.value = Some(v);
                v
            },
        }
    }
}
#[derive(PartialEq, Debug)]
pub struct Shoe{
    size: u32,
    style: String,
}

impl Shoe{
    pub fn new(size: u32, style: String) -> Shoe{
        Shoe { size, style, }
    }
}

pub fn shoes_in_my_size(shoes: Vec<Shoe>, shoe_size: u32) -> Vec<Shoe>{
    shoes.into_iter().filter(|s|s.size == shoe_size).collect()
}

pub struct Counter{
    count: u32,
}

impl Counter{
    pub fn new() -> Counter{
        Counter{ count: 0, }
    }
}

impl Iterator for Counter{
    type Item = u32;

    fn next(&mut self) -> Option<Self::Item>{
        self.count += 1;
        if self.count < 6{
            Some(self.count)
        }else{
            None
        }
    }
}