| % FFI |
| |
| <small>There is a new edition of the book and this is an old link.</small> |
| |
| > Sometimes, your Rust code may need to interact with code written in another language. |
| > To do this, Rust has a keyword, `extern`, that facilitates creating and using a _Foreign Function Interface_ (FFI). |
| |
| ```rust |
| extern "C" { |
| fn abs(input: i32) -> i32; |
| } |
| |
| fn main() { |
| unsafe { |
| println!("Absolute value of -3 according to C: {}", abs(-3)); |
| } |
| } |
| ``` |
| |
| --- |
| |
| You can find the latest version of this information |
| [here](ch20-01-unsafe-rust.html#using-extern-functions-to-call-external-code) |
