std::thread::Result - Rust
Description: API documentation for the Rust `Result` type in crate `std`.
Keywords: rust, rustlang, rust-lang, Result

# 1.0.0[−][src]Type Definition std::thread::Result

    type Result<T> = Result<T, Box<dyn Any + Send + 'static>>;

A specialized `Result` type for threads.

Indicates the manner in which a thread exited.

The value contained in the `Result::Err` variant is the value the thread panicked with; that is, the argument the `panic!` macro was called with. Unlike with normal errors, this value doesn't implement the `Error` trait.

Thus, a sensible way to handle a thread panic is to either:

1. `unwrap` the `Result<T>`, propagating the panic
2. or in case the thread is intended to be a subsystem boundary that is supposed to isolate system-level failures, match on the `Err` variant and handle the panic in an appropriate way.

A thread that completes without panicking is considered to exit successfully.

# Examples

    use std::thread;
    use std::fs;

    fn copy_in_thread() -> thread::Result<()> {
        thread::spawn(move || { fs::copy("foo.txt", "bar.txt").unwrap(); }).join()
    }

    fn main() {
        match copy_in_thread() {
            Ok(_) => println!("this is fine"),
            Err(_) => println!("thread panicked"),
        }
    }

Run