std_lib/
async_fn_trait.rs

1use std::future::Future;
2
3pub trait AsyncFnOnce<Args> {
4    type Output;
5    type Future: Future<Output = Self::Output> + Send;
6    fn call_once(self, _: Args) -> Self::Future;
7}
8
9pub trait AsyncFnMut<Args>: AsyncFnOnce<Args> {
10    fn call_mut(&mut self, args: Args) -> Self::Future;
11}
12
13pub trait AsyncFn<Args>: AsyncFnMut<Args> {
14    fn call(&self, args: Args) -> Self::Future;
15}
16
17impl<Func, Args> AsyncFnOnce<Args> for Func
18where
19    Func: crate::fn_trait::FnOnce<Args>,
20    Func::Output: Future + Send,
21{
22    type Output = <Func::Output as Future>::Output;
23    type Future = Func::Output;
24
25    fn call_once(self, args: Args) -> Self::Future {
26        Func::call_once(self, args)
27    }
28}
29
30impl<Func, Args> AsyncFnMut<Args> for Func
31where
32    Func: crate::fn_trait::FnMut<Args>,
33    Func::Output: Future + Send,
34{
35    fn call_mut(&mut self, args: Args) -> Self::Future {
36        Func::call_mut(self, args)
37    }
38}
39
40impl<Func, Args> AsyncFn<Args> for Func
41where
42    Func: crate::fn_trait::Fn<Args>,
43    Func::Output: Future + Send,
44{
45    fn call(&self, args: Args) -> Self::Future {
46        Func::call(self, args)
47    }
48}
std_lib/async_fn_trait.rs

std_lib/
async_fn_trait.rs
