As with most things in Rust, in a pattern, a keyword means the *opposite* of its normal meaning. So where `box e` in an expression will box up the result of `e`, `box p` in a pattern will unbox `p`.
On Tue, May 27, 2014 at 9:50 AM, Tommi <rusty.ga...@icloud.com> wrote: > What is the meaning of this 'box ref foo' syntax found in the tutorial over > at http://doc.rust-lang.org/tutorial.html#references > > In short, it's: > > enum Shape { Sphere(Box<f32>) } > > let shape = Sphere(box 1.0f32); > let r = match shape { > Sphere(box ref radius) => *radius > }; > > I thought the 'box' keyword meant: "allocate on heap and wrap into a Box". > That doesn't make sense to me in the context of 'box ref radius'. > > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev -- http://octayn.net/ _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
