https://github.com/idanarye/rust-smart-default

Rust macro for automatically generating default
https://github.com/idanarye/rust-smart-default

Last synced: about 2 months ago
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Rust macro for automatically generating default

• Host: GitHub
• URL: https://github.com/idanarye/rust-smart-default
• Owner: idanarye
• License: mit
• Created: 2017-08-16T19:35:02.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2023-12-22T01:41:32.000Z (9 months ago)
• Last Synced: 2024-04-25T15:02:34.526Z (5 months ago)
• Language: Rust
• Size: 51.8 KB
• Stars: 123
• Watchers: 3
• Forks: 7
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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# Rust SmartDefault

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

```rust

use smart_default::SmartDefault;

#[derive(SmartDefault)]

enum Foo {

    Bar,

    #[default]

    Baz {

        #[default = 12]

        a: i32,

        b: i32,

        #[default(Some(Default::default()))]

        c: Option,

        #[default(_code = "vec![1, 2, 3]")]

        d: Vec,

        #[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), and version 1.56

due to 2021 edition.