How do I create a nested structure? - struct

Question

I'm implementing a method that has a nested structure call.
I read about Rust lifetimes and I think my problem is about lifetimes, but I cannot understand how can I use this in the code.
#[derive(Debug)]
pub struct Request {
Header: String
}
#[derive(Debug)]
pub enum Proto {
HTTP,
HTTPS
}
#[derive(Debug)]
pub struct HTTP {
ssss: Request,
names: Proto,
}
impl HTTP {
pub fn new(name: Proto) -> HTTP {
HTTP{
ssss.Header: "Herman".to_string(),
names: name,
}
}
}
It's not possible assign a value to ssss.Header:
error: expected one of `,` or `}`, found `.`
--> src/main.rs:20:17
|
20 | ssss.Header: "Herman".to_string(),
| ^ expected one of `,` or `}` here
error[E0425]: cannot find value `ssss` in this scope
--> src/main.rs:20:13
|
20 | ssss.Header: "Herman".to_string(),
| ^^^^
| |
| `self` value is only available in methods with `self` parameter
| help: try: `self.ssss`
error[E0063]: missing field `names` in initializer of `HTTP`
--> src/main.rs:19:9
|
19 | HTTP{
| ^^^^ missing `names`

Answer 1

There is nothing magical about nested structures. You use the exact same syntax as a non-nested structure:
pub fn new(name: Proto) -> HTTP {
HTTP {
ssss: Request {
header: "Herman".to_string(),
},
names: name,
}
}
If you find the nesting too complicated, you can always introduce an intermediate variable:
pub fn new(names: Proto) -> HTTP {
let ssss = Request {
header: "Herman".to_string(),
};
HTTP { ssss, names }
}
Note: idiomatic Rust uses snake_case for identifiers like variables, methods, and struct properties. I've renamed your Header to header to avoid warnings.