Attribute Macro bot_new

#[bot_new]

#[bot_new] macro adds initialization of field added by #[bot] macro.

Usage:

#[bot]
struct MyBot;

impl MyBot {
    #[bot_new]
    fn new() -> MyBot {
        MyBot
    }
}

If your bot implements Default then you don’t need it, since Bot implements Default too and will be filled automatically:

#[bot]
#[derive(Default)]
struct MyBot;

fn main() {
    let bot = MyBot::default();
}

#[bot]
#[derive(Default)]
struct MyBot {
    field: Type,
    field2: Type2,
    field_n: TypeN,
}

impl MyBot {
    fn new() -> MyBot {
        MyBot {
            field: Type::init(),
            field2: Type2::init(),
            ..Default::default(),
        }
    }
}

fn main() {
    let bot = MyBot::new();
}

Macro Inside

This:

#[bot]
struct MyBot;

impl MyBot {
    #[bot_new]
    fn new() -> MyBot {
        MyBot
    }
}

Expands to:

struct MyBot {
    _bot: Bot,
}

impl MyBot {
    fn new() -> MyBot {
        MyBot {
            _bot: Default::default(),
        }
    }
}

And this:

#[bot]
struct MyBot {
    field: Type,
    field2: Type2,
}

impl MyBot {
    #[bot_new]
    fn new() -> MyBot {
        MyBot {
            field: Type::init(),
            field2: Type2::init(),
        }
    }
}

Expands to:

struct MyBot {
    _bot: Bot,
    field: Type,
    field2: Type2,
}

impl MyBot {
    fn new() -> MyBot {
        MyBot {
            _bot: Default::default(),
            field: Type::init(),
            field2: Type2::init(),
        }
    }
}