CODEWITHSUNDEEP
multithreadingrust
sbditto85
sbditto85

Reputation: 1545

Is there any way to call a closure inside a spawned thread?

I have a function:

fn awesome_function<F>(v: Vec<u64>, f: F)
    where F: Fn(u64) -> String
{ /* ... */ }

Is there any way to call that passed in function inside a spawned thread? Something like:

...
thread::spawn(move || f(1));
...

I've tried a few different ways and I get an error error: the trait core::marker::Send is not implemented for the type F [E0277]

Upvotes: 2

Views: 199

Answers (1)

Shepmaster
Shepmaster

Reputation: 430981

Absolutely. The main thing you have to do is restrict F to also be Send:

use std::thread;

fn awesome_function<F>(v: Vec<u64>, f: F) -> String
    where F: Fn(u64) + Send + 'static
{
    thread::spawn(move || f(1));
    unimplemented!()
}

fn main() {}

You also need to restrict it to 'static, as also required by thread::spawn.

Upvotes: 5

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