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# collect-once-hashmap
This crate provides a type `CollectOnceHashMap` (and the same for `BTreeMap`
that can be collected from an iterator just like a normal
`std::collections::HashMap`, but it makes sure that a duplicated key results in
an error.
Example:
```rust
# use collect_once_hashmap::{CollectOnceHashMap, Error};
let hm = vec![(1, 1), (1, 2)]
.into_iter()
.collect::<CollectOnceHashMap<u8, u8>>()
.into_inner();
assert!(hm.is_err());
assert!(std::matches!(hm, Err(Error::DuplicatedKey(1))));
let bm = vec![(1, 1), (1, 2)]
.into_iter()
.collect::<CollectOnceBTreeMap<u8, u8>>()
.into_inner();
assert!(bm.is_err());
assert!(std::matches!(bm, Err(Error::DuplicatedKey(1))));
```
# License
MPL-2.0
(c) Matthias Beyer
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