Module rune::alloc::clone

The TryClone trait for types that cannot be ‘implicitly copied’.

In Rust, some simple types are “implicitly copyable” and when you assign them or pass them as arguments, the receiver will get a copy, leaving the original value in place. These types do not require allocation to copy and do not have finalizers (i.e., they do not contain owned boxes or implement Drop), so the compiler considers them cheap and safe to copy. For other types copies must be made explicitly, by convention implementing the TryClone trait and calling the try_clone method.

Basic usage example:

use rune::alloc::String;
use rune::alloc::prelude::*;

// String type implements TryClone
let s = String::new();
// ... so we can clone it
let copy = s.try_clone()?;

To easily implement the TryClone trait, you can also use #[derive(TryClone)]. Example:

use rune::alloc::prelude::*;

// we add the TryClone trait to Morpheus struct
#[derive(TryClone)]
struct Morpheus {
   blue_pill: f32,
   red_pill: i64,
}

let f = Morpheus { blue_pill: 0.0, red_pill: 0 };
// and now we can clone it!
let copy = f.try_clone()?;

Traits

• TryClone
  Fallible TryClone trait.
• TryCopy
  Marker trait for types which are Copy.

Derive Macros

• TryClone