Winter maybe-async

此crate包含maybe_async过程属性宏和maybe_await过程宏，用于抽象Rust的同步/异步。

maybe_async

maybe_async宏将根据是否启用了async功能，有条件地向它标记的函数添加async关键字。要生成异步版本，请在crate上启用async功能。如果async功能未开启，将生成同步版本。例如，

// Adding `maybe_async` to trait functions
trait ExampleTrait {
    #[maybe_async]
    fn say_hello(&self);

    #[maybe_async]
    fn get_hello(&self) -> String;
}

// Adding `maybe_async` to regular functions
#[maybe_async]
fn hello_world() {
    // ...
}

当async功能启用时，上面的代码将转换为

trait ExampleTrait {
    async fn say_hello(&self);

    async fn get_hello(&self) -> String;
}

async fn hello_world() {
    // ...
}

maybe_await

为了补充maybe_async，我们还有一个maybe_await过程宏，它根据async功能标志有条件地向表达式的末尾添加.await关键字。

#[maybe_async]
fn hello_world() {
    // Adding `maybe_await` to an expression
    let w = maybe_await!(world());

    println!("hello {}", w);
}

#[maybe_async]
fn world() -> String {
    "world".to_string()
}

当async功能启用时，上面的代码将转换为

async fn hello_world() {
    let w = world().await;

    println!("hello {}", w);
}

async fn world() -> String {
    "world".to_string()
}

许可证

此项目遵循MIT许可证。