# refset - non-owning `HsahSet`

A hash-set analogue that does not own its data.

It can be used to "mark" items without the need to transfer ownership to the map

# Example use case
 ```rust
 /// Process arguments while ignoring duplicates
 fn process_args(args: impl IntoIterator<Item=String>) {
   let mut same=  HashRefSet::new();
   for argument in args.into_iter()
   {
     if !same.insert(argument.as_str()) {
       // Already processed this input, ignore
       continue;
     }
     //do work...
   }
 }
 ```
# Serialisation support with `serde` crate
 `HashRefSet` and `HashType` both implement `Serialize` and `Deserialize` from the `serde` crate if the `serde` feature is enabled. By default it is not.
 
# Drawbacks
 Since the item is not inserted itself, we cannot use `Eq` to double check there was not a hash collision.
 While the hashing algorithm used (Sha512) is extremely unlikely to produce collisions, especially for small data types, keep in mind that it is not infallible.

# License
MIT