1b12ac153Sopenharmony_ci# cfg-if
2b12ac153Sopenharmony_ci
3b12ac153Sopenharmony_ci[Documentation](https://docs.rs/cfg-if)
4b12ac153Sopenharmony_ci
5b12ac153Sopenharmony_ciA macro to ergonomically define an item depending on a large number of #[cfg]
6b12ac153Sopenharmony_ciparameters. Structured like an if-else chain, the first matching branch is the
7b12ac153Sopenharmony_ciitem that gets emitted.
8b12ac153Sopenharmony_ci
9b12ac153Sopenharmony_ci```toml
10b12ac153Sopenharmony_ci[dependencies]
11b12ac153Sopenharmony_cicfg-if = "0.1"
12b12ac153Sopenharmony_ci```
13b12ac153Sopenharmony_ci
14b12ac153Sopenharmony_ci## Example
15b12ac153Sopenharmony_ci
16b12ac153Sopenharmony_ci```rust
17b12ac153Sopenharmony_cicfg_if::cfg_if! {
18b12ac153Sopenharmony_ci    if #[cfg(unix)] {
19b12ac153Sopenharmony_ci        fn foo() { /* unix specific functionality */ }
20b12ac153Sopenharmony_ci    } else if #[cfg(target_pointer_width = "32")] {
21b12ac153Sopenharmony_ci        fn foo() { /* non-unix, 32-bit functionality */ }
22b12ac153Sopenharmony_ci    } else {
23b12ac153Sopenharmony_ci        fn foo() { /* fallback implementation */ }
24b12ac153Sopenharmony_ci    }
25b12ac153Sopenharmony_ci}
26b12ac153Sopenharmony_ci
27b12ac153Sopenharmony_cifn main() {
28b12ac153Sopenharmony_ci    foo();
29b12ac153Sopenharmony_ci}
30b12ac153Sopenharmony_ci```
31b12ac153Sopenharmony_ci
32b12ac153Sopenharmony_ci# License
33b12ac153Sopenharmony_ci
34b12ac153Sopenharmony_ciThis project is licensed under either of
35b12ac153Sopenharmony_ci
36b12ac153Sopenharmony_ci * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
37b12ac153Sopenharmony_ci   http://www.apache.org/licenses/LICENSE-2.0)
38b12ac153Sopenharmony_ci * MIT license ([LICENSE-MIT](LICENSE-MIT) or
39b12ac153Sopenharmony_ci   http://opensource.org/licenses/MIT)
40b12ac153Sopenharmony_ci
41b12ac153Sopenharmony_ciat your option.
42b12ac153Sopenharmony_ci
43b12ac153Sopenharmony_ci### Contribution
44b12ac153Sopenharmony_ci
45b12ac153Sopenharmony_ciUnless you explicitly state otherwise, any contribution intentionally submitted
46b12ac153Sopenharmony_cifor inclusion in `cfg-if` by you, as defined in the Apache-2.0 license, shall be
47b12ac153Sopenharmony_cidual licensed as above, without any additional terms or conditions.
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