| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| /*! |
| The kind traits |
| |
| Rust types can be classified in various useful ways according to |
| intrinsic properties of the type. These classifications, often called |
| 'kinds', are represented as traits. |
| |
| They cannot be implemented by user code, but are instead implemented |
| by the compiler automatically for the types to which they apply. |
| |
| */ |
| |
| /// Types able to be transferred across task boundaries. |
| #[lang="send"] |
| pub trait Send { |
| // empty. |
| } |
| |
| /// Types that are either immutable or have inherited mutability. |
| #[lang="freeze"] |
| pub trait Freeze { |
| // empty. |
| } |
| |
| /// Types with a constant size known at compile-time. |
| #[lang="sized"] |
| pub trait Sized { |
| // Empty. |
| } |
