any_handle

License: MIT | crates.io | docs.rs

any_handle provides a reference-counting smart pointer type, AnyHandle<T>, which can store a value of a type T. The special AnyHandle<dyn Any> allows for downcasting to any other AnyHandle<T: Any> type.

Internally, an AnyHandle is an Arc<RwLock<Box<dyn Any>>>, and matches the reference-counting behaviour of Arc as well as the many-readers-or-one-writer thread safety model of RwLock.

```rust use any_handle::{AnyHandle, Any}; struct SomeStruct (i32);

fn main() { // Initialize a handle with an unknown type. // If you want to pass in a Box, instead of a concrete // type, you will have to use #![feature(trait_upcasting)], unfortunately. let handle: AnyHandle = AnyHandle::new(Box::new(SomeStruct(12))); // Now we can put it in some sort of generic container...

// ...and when we retrieve it later:
let mut handle: AnyHandle<SomeStruct> = handle.into()?;
handle.write().do_mut_things_with();
handle.read().do_things_with();

} ```