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
Command Line
--no-default <regex>
Annotations
/**
* 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
// Include the generated bindings.
include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
impl Default for Header {
fn default() -> Self {
Self {
magic: 0x10203040u32,
data: [0; 252usize],
}
}
}