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#38 in Procedural macros

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Used in 282 crates (92 directly)

MIT license

15KB
251 lines

Build Status Latest Version Rust Documentation

Rust SmartDefault

Custom derive for automatically implementing the Default trait with customized default values:

use smart_default::SmartDefault;

#[derive(SmartDefault)]
enum Foo {
    Bar,
    #[default]
    Baz {
        #[default = 12]
        a: i32,
        b: i32,
        #[default(Some(Default::default()))]
        c: Option<i32>,
        #[default(_code = "vec![1, 2, 3]")]
        d: Vec<u32>,
        #[default = "four"]
        e: String,
    },
    Qux(i32),
}

assert!(Foo::default() == Foo::Baz {
    a: 12,
    b: 0,
    c: Some(0),
    d: vec![1, 2, 3],
    e: "four".to_owned(),
});

Requires Rust 1.30+ (for non-string values in attributes)

Dependencies

~335–790KB
~19K SLoC