Impl Into Macro

The implementation of trait Into.

See more macros: docs, repository.

Examples:

Struct

#[derive(Into, Debug, PartialEq)]
pub struct Email(String);

let email = Email("user@example.com".to_string());
let email_str: String = email.into();

assert_eq!("user@example.com", &email_str);

Enum

#[derive(Into)]
pub enum Number {
    Integer(i32),

    #[into(i32, expr = value as i32)]
    Float(f64),

    #[into(i32, expr = 0)]
    Null,

    #[into(i32, with = Self::from_str)]
    Stringify(&'static str),
}

impl Number {
    fn from_str(s: &str) -> i32 {
        s.parse::<i32>().unwrap_or(0)
    }
}

assert_eq!(42, Number::Integer(42).into());
assert_eq!(3, Number::Float(3.14).into());
assert_eq!(0, Number::Null.into());
assert_eq!(15, Number::Stringify("15").into());

License & Feedback:

This library distributed under the MIT license.

You can contact me via GitHub or send a message to my E-Mail. This library is actively evolving, and your suggestions and feedback are always welcome!