ViewCount With Sum

main.rs

mod domain {
    use std::ops::Deref;
    
    pub struct ViewCount { value: usize }
    
    impl ViewCount {
        pub fn new(value: usize) -> Self {
            Self { value }
        }
    }
    impl Deref for ViewCount {
        type Target = usize;
        fn deref(&self) -> &Self::Target {
            &self.value
        }
    }
    
    pub struct Title { value: String, }
    
    impl Title {
        pub fn new(value: String) -> Self { Self { value }}
    }
    
    impl Deref for Title  {
        type Target = String;
        fn deref(&self) -> &Self::Target {
            &self.value
        }
    }
}

use domain::*;

fn main() {
    let viewcounts = vec![ViewCount::new(3), ViewCount::new(5), ViewCount::new(7)];
    let sum: usize = Iterator::sum(viewcounts.into_iter().map(|vc| *vc));
    
    let report_title = Title::new("View Counts".to_string());
    let report_title_length = report_title.len();
    println!("-- {} ({})--", *report_title, report_title_length);
    println!("total views: {}", sum);
}