# `bindgen`
**`bindgen` automatically generates Rust FFI bindings to C and C++ libraries.**
For example, given the C header `cool.h`:
```c
typedef struct CoolStruct {
int x;
int y;
} CoolStruct;
void cool_function(int i, char c, CoolStruct* cs);
```
`bindgen` produces Rust FFI code allowing you to call into the `cool` library's
functions and use its types:
```rust
/* automatically generated by rust-bindgen */
#[repr(C)]
pub struct CoolStruct {
pub x: ::std::os::raw::c_int,
pub y: ::std::os::raw::c_int,
}
extern "C" {
pub fn cool_function(i: ::std::os::raw::c_int,
c: ::std::os::raw::c_char,
cs: *mut CoolStruct);
}
```
## Users Guide
[📚 Read the `bindgen` users guide here! 📚](https://servo.github.io/rust-bindgen)
## API Reference
[API reference documentation is on docs.rs](https://docs.rs/bindgen)
## Contributing
[See `CONTRIBUTING.md` for hacking on `bindgen`!](./CONTRIBUTING.md)
