Hello you need to my ask something about rust

[Bora]

What does this lines of code mean?

pub trait CacheableItem: Clone + Default + fmt::Debug + Decodable + Encodable {
  type Address: AsRef<[u8]> + Clone + fmt::Debug + Eq + Hash; 
  fn is_null(&self) -> bool;
}

impl<T: Summary + Clone + Default > Controller<T> 
{

fn is_null(&self) -> bool
{ 
// Other codes
}

}

[semicoleon]

Can you be a little more specific? There are a lot of different language features being used there, and not a lot of context for what the actual goal is.

If you don't know where to start The Rust Book may be a good choice for learning more.

[Bora]

just wondering what that means
<T: Debug + Clone>

What does he mean by "Debug + Clone" in this line?

Also, could a struct or enumeration be used instead of using trait in this line, for example:

struct Point {
    x: i32,
    y: i32,
}

<T: Point>
OR
<T: Point + Debug + Clone>

[semicoleon]

<T: Debug + Clone> means roughly "Each time this item is used there will be a concrete type in place of T, but we don't know anything about that type except that it must implement both Debug and Clone"

You can't use a struct there, only traits.

[alice]

In the future, please properly format your code:

Forum Code Formatting and Syntax Highlighting

To format code in this forum you need to surround the code with three backticks (```). For example, typing this... ``` fn main() { println!() } ``` ...will be rendered as highlighted Rust code, like so: fn main() { println!() } You can also tell the forum software which language you're using by adding the language after the opening backticks. ```cpp #include <iostream> int main() { std::cout << "Hello World!"; } ``` Will appear with highlighting as: #include <iostream> int main(…

I know that some people answer questions that aren't properly formatted, but I certainly don't.

[Bora]

Sorry didn't see the formatting option I formatted it now