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//! Traits Deep Dive, Part 2
//!
//!   - **Date:** June 19, 2018
//!   - **Subject:** Operators as sugar for traits, traits as generic
//!     constraints, monomorphization, and universal and existential types.
//!   - [**Audio**][mp3]
//!
//! [mp3]: https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e024.mp3
//!
//! <audio style="width: 100%" title="" controls preload=metadata>
//!   <source src="https://www.podtrac.com/pts/redirect.mp3/cdn.newrustacean.com/file/newrustacean/e024.mp3">
//! </audio>
//!
//!
//! Show Notes
//! ----------
//!
//! - on monomorphization, see also [Sean Griffin's RustConf 2017 talk][sgrc2017]
//! - [zero-cost abstractions]
//!
//! [sgrc2017]: https://www.youtube.com/watch?v=wxPehGkoNOw
//! [zero-cost abstractions]: https://blog.rust-lang.org/2015/05/11/traits.html
//!
//! Sponsors
//! --------
//!
//!   - Aaron Turon
//!   - Alexander Payne
//!   - [Anthony Deschamps]
//!   - Anthony Scotti
//!   - Antonin Carette
//!   - Aleksey Pirogov
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//!
//! [Anthony Deschamps]: https://github.com/adeschamps
//! [Behnam Esfahbod]: https://github.com/behnam
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//!
//! (Thanks to the couple people donating who opted out of the reward tier, as
//! well. You know who you are!)
//!
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//!
//!
//! Contact
//! -------
//!
//!   - New Rustacean:
//!     + Twitter: [@newrustacean](https://www.twitter.com/newrustacean)
//!     + Email: [[email protected]](mailto:[email protected])
//!   - Chris Krycho
//!     + GitHub: [chriskrycho](https://github.com/chriskrycho)
//!     + Twitter: [@chriskrycho](https://www.twitter.com/chriskrycho)

use std::fmt::Display;
use std::ops::Add;

#[doc(include = "../docs/e024-script.md")]
pub struct Script;

/// A data structure which will implement `std::ops::Add`.
///
/// With the implementation in place, we can do this:
///
/// ```rust
/// # use show_notes::e024::*;
/// # fn main() {
/// let a = Point {
///     x: 123,
///     y: 234,
///     z: 345,
/// };
///
/// let b = Point {
///     x: 456,
///     y: 567,
///     z: 678,
/// };
///
/// let c = a + b;
/// # }
/// ```
pub struct Point {
    pub x: i32,
    pub y: i32,
    pub z: i32,
}

impl Add for Point {
    type Output = Point;

    fn add(self, other: Point) -> Point {
        Point {
            x: self.x + other.x,
            y: self.y + other.y,
            z: self.z + other.z,
        }
    }
}

/// Demonstrate a generic trait.
pub trait Eatable<T> {
    fn eat(&self) -> T;
}

impl Eatable<String> for i32 {
    fn eat(&self) -> String {
        self.to_string()
    }
}

/// Demonstrate the ability to take a trait constraint on a generic inline.
pub fn to_string_inline<T: Display>(t: T) -> String {
    format!("{}", t)
}

/// Demonstrate the ability to take a trait constraint on a generic with a
/// `where` clause.
pub fn to_string_with_where<T>(t: T) -> String
where
    T: Display,
{
    format!("{}", t)
}