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# Preventing the Derivation of `Default`
`bindgen` will attempt to derive/impl the `Default` traits on a best-effort basis.
Sometimes, we need customize the implement of `Default` for certain types,
In these cases, the `nodefault` annotation can be used to prevent bindgen
to autoderive the `Default` traits for a type.
### Library
* [`bindgen::Builder::no_default`](https://docs.rs/bindgen/latest/bindgen/struct.Builder.html#method.no_default)
### Command Line
* `--no-default <regex>`
### Annotations
```c
/**
* We need to specify some preset values as the Default of Header.
*
* for example:
*
* <div rustbindgen nodefault></div>
*/
struct Header {
unsigned int magic;
unsigned char data[252];
};
...
```
### Customize Implements
```rust,ignore
// Include the generated bindings.
include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
impl Default for Header {
fn default() -> Self {
Self {
magic: 0x10203040u32,
data: [0; 252usize],
}
}
}
```
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