| # cfg-if |
| |
| [Documentation](https://docs.rs/cfg-if) |
| |
| A macro to ergonomically define an item depending on a large number of #[cfg] |
| parameters. Structured like an if-else chain, the first matching branch is the |
| item that gets emitted. |
| |
| ```toml |
| [dependencies] |
| cfg-if = "0.1" |
| ``` |
| |
| ## Example |
| |
| ```rust |
| cfg_if::cfg_if! { |
| if #[cfg(unix)] { |
| fn foo() { /* unix specific functionality */ } |
| } else if #[cfg(target_pointer_width = "32")] { |
| fn foo() { /* non-unix, 32-bit functionality */ } |
| } else { |
| fn foo() { /* fallback implementation */ } |
| } |
| } |
| |
| fn main() { |
| foo(); |
| } |
| ``` |
| |
| # License |
| |
| This project is licensed under either of |
| |
| * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or |
| http://www.apache.org/licenses/LICENSE-2.0) |
| * MIT license ([LICENSE-MIT](LICENSE-MIT) or |
| http://opensource.org/licenses/MIT) |
| |
| at your option. |
| |
| ### Contribution |
| |
| Unless you explicitly state otherwise, any contribution intentionally submitted |
| for inclusion in `cfg-if` by you, as defined in the Apache-2.0 license, shall be |
| dual licensed as above, without any additional terms or conditions. |
