Re: [rust-dev] Front page example

2013-06-23 Thread Ashish Myles 
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 dbau...@gmail.com 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?
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 Rust-dev@mozilla.org
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 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
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[rust-dev] Front page example

2013-06-22 Thread Ashish Myles 
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?
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Rust-dev@mozilla.org
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Re: [rust-dev] Front page example

2013-06-22 Thread Huon Wilson 

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
Rust-dev@mozilla.org
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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
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