Fn 使用普通函數(shù)作為實際調(diào)用參數(shù)
use std::future::Future;
#[tokio::main]
async fn main() {
println!("Hello, world!");
let _ = call_get_url("12345".to_string(), 123456, 1234567890, &get_download_link);
println!("Hello, world2!");
}
fn call_get_url<DF>(
remote_path: String,
fs_id: u64,
app_id: u32,
func: DF,
) -> Result<String, String>
where
DF: Fn(String, u64, u32) -> Result<String, String>,
{
func(remote_path, fs_id, app_id)
}
fn get_download_link(remote_path: String, fs_id: u64, app_id: u32) -> Result<String, String> {
println!(
"get_download_link:remote_path:{},fs_id:{},:app_id{}",
remote_path, fs_id, app_id
);
return Ok("this is the download link ".to_string());
}
Fn 使用異步函數(shù)作為實際調(diào)用參數(shù)
use std::future::Future;
#[tokio::main]
async fn main() {
println!("Hello, world!");
let _ = call_get_url_async(
"12345".to_string(),
123456,
1234567890,
&get_download_link_async,
)
.await;
println!("Hello, world2!");
}
async fn call_get_url_async<T>(
remote_path: String,
fs_id: u64,
app_id: u32,
func: impl Fn(String, u64, u32) -> T,
) -> T::Output
where
T: Future,
{
return func(remote_path, fs_id, app_id).await;
}
async fn get_download_link_async(
remote_path: String,
fs_id: u64,
app_id: u32,
) -> Result<String, String> {
println!(
"get_download_link_async:remote_path:{},fs_id:{},:app_id{}",
remote_path, fs_id, app_id
);
return Ok("this is the download link async ".to_string());
}
