Default Macro

A convenient macro to implement Default for structs using field initializers.

Example

Add this to your Cargo.toml:

[dependencies]
default2 = "2"

Use the default2::default! macro to define a struct and its default values in one place.

default2::default! {
    #[derive(Debug, PartialEq)]
    struct Process {
        id: i32 = 10,
        name: String = "main".into(),
        cpus: usize = num_cpus::get(),
        payload: u64,
    }
}

The macro will generate the standard struct definition along with a Default implementation:

#[derive(Debug, PartialEq)]
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(),
            payload: std::default::Default::default(),
        }
    }
}