Default2

Default implementation using macros

Example

Use Default2 to set default value of each field using a macro:

use default2::Default2;

#[derive(Default2)]
struct Process {
    #[default(10)]
    id: i32,
    #[default("main".into())]
    name: String,
    #[default(num_cpus::get())]
    cpus: usize,
    #[default(vec![1, 2, 3])]
    vector: Vec<u64>,
    payload: u64,
}

The following code will be generated:

struct Process {
    id: i32,
    name: String,
    cpus: usize,
    payload: u64,
}

impl Default for Process {
    fn default() -> Self {
        Process {
            id: 10,
            name: "main".into(),
            cpus: num_cpus::get(),
            vector: vec![1, 2, 3],
            payload: Default::default(),
        }
    }
}