| // Copyright 2018 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. |
| |
| /// A simple static assertion macro. The first argument should be a unique |
| /// ALL_CAPS identifier that describes the condition. |
| #[macro_export] |
| #[allow_internal_unstable] |
| macro_rules! static_assert { |
| ($name:ident: $test:expr) => { |
| // Use the bool to access an array such that if the bool is false, the access |
| // is out-of-bounds. |
| #[allow(dead_code)] |
| static $name: () = [()][!($test: bool) as usize]; |
| } |
| } |