Great, thanks, it works! Is there a way to invoke the shuffle() without bringing it explicitly into local scope, say via some verbose way that specifies the trait to be used?
Ashish On Sat, Jun 22, 2013 at 11:00 PM, Huon Wilson <[email protected]> wrote: > On 23/06/13 12:53, Ashish Myles wrote: >> >> I have been out of rust for a bit, and coming back to it, I am having >> a difficult time adapting the front page example at >> http://www.rust-lang.org/ to the trunk version of rust (updated last >> night). I turned the example to >> >> -------- >> use std::*; >> >> fn main() { >> for ["Alice", "Bob", "Carol"].each |&name| { >> do task::spawn { >> let v = rand::rng().shuffle([1, 2, 3]); >> for v.each |&num| { >> io::print(fmt!("%s says: '%d'\n", name, num)) >> } >> } >> } >> } >> -------- >> >> and rustc complains with >> >> -------- >> hello.rs:6:20: 6:51 error: type `std::rand::IsaacRng` does not >> implement any method in scope named `shuffle` >> hello.rs:6 let v = rand::rng().shuffle([1, 2, 3]); >> -------- >> >> and a type inference error triggered by this part failing. In >> libstd/rand.rs, RngUtil seems to be defined for everything >> implementing Rng, which IsaacRng does. Is this a bug or is it some >> change in the lookup? >> _______________________________________________ >> Rust-dev mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/rust-dev > > > To use the methods from a trait, it has to be in scope, so: > > use std::rand::{rng, RngUtil}; > > > fn main() { > for ["Alice", "Bob", "Carol"].each |&name| { > do spawn { > let v = rng().shuffle([1, 2, 3]); > for v.each |&num| { > > print(fmt!("%s says: '%d'\n", name, num)) > } > } > } > } > > seems to work with my rustc (ba05af7 2013-06-20 22:28:52 -0700). > > (The reason many other traits don't need to be explicitly imported > is that they are exported from std::prelude, which is implicitly added > as `use std::prelude::*;` at the top of every mod.) > > > Huon > _______________________________________________ > Rust-dev mailing list > [email protected] > https://mail.mozilla.org/listinfo/rust-dev _______________________________________________ Rust-dev mailing list [email protected] https://mail.mozilla.org/listinfo/rust-dev
