Absorb ideas from the C++ unordered_set library

Think about the upgrades listed below. A reference to any other functions should also be included.


### Capacity

- [ ] [empty](https://en.cppreference.com/w/cpp/container/unordered_set/empty)
- [ ] [size](https://en.cppreference.com/w/cpp/container/unordered_set/size)


### Modifiers

- [ ] [clear](https://en.cppreference.com/w/cpp/container/unordered_set/clear)
- [ ] [insert](https://en.cppreference.com/w/cpp/container/unordered_set/insert)
- [ ] [erase](https://en.cppreference.com/w/cpp/container/unordered_set/erase)
- [ ] [swap](https://en.cppreference.com/w/cpp/container/unordered_set/swap)
- [ ] [extract](https://en.cppreference.com/w/cpp/container/unordered_set/extract)
- [ ] [merge](https://en.cppreference.com/w/cpp/container/unordered_set/merge)


### Lookup

- [ ] [count](https://en.cppreference.com/w/cpp/container/unordered_set/count)
- [ ] [find](https://en.cppreference.com/w/cpp/container/unordered_set/find)
- [ ] [contains](https://en.cppreference.com/w/cpp/container/unordered_set/contains)
- [ ] [equal_range](https://en.cppreference.com/w/cpp/container/unordered_set/equal_range)


### Bucket interface

- [ ] [bucket_count](https://en.cppreference.com/w/cpp/container/unordered_set/bucket_count)
- [ ] [max_bucket_count](https://en.cppreference.com/w/cpp/container/unordered_set/max_bucket_count)
- [ ] [bucket_size](https://en.cppreference.com/w/cpp/container/unordered_set/bucket_size)
- [ ] [bucket](https://en.cppreference.com/w/cpp/container/unordered_set/bucket)


### Hash policy

- [ ] [load_factor](https://en.cppreference.com/w/cpp/container/unordered_set/load_factor)
- [ ] [max_load_factor](https://en.cppreference.com/w/cpp/container/unordered_set/max_load_factor)
- [ ] [rehash](https://en.cppreference.com/w/cpp/container/unordered_set/rehash)
- [ ] [reserve](https://en.cppreference.com/w/cpp/container/unordered_set/reserve)


### Observers

- [ ] [hash_function](https://en.cppreference.com/w/cpp/container/unordered_set/hash_function)
- [ ] [key_eq](https://en.cppreference.com/w/cpp/container/unordered_set/key_eq)


### Non-member functions

- [ ] [swap2](https://en.cppreference.com/w/cpp/container/unordered_set/swap2)
- [ ] [erase_if](https://en.cppreference.com/w/cpp/container/unordered_set/erase_if)


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Absorb ideas from the C++ unordered_set library #6

Capacity

Modifiers

Lookup

Bucket interface

Hash policy

Observers

Non-member functions

Metadata

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Labels

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Absorb ideas from the C++ unordered_set library #6

Description

Capacity

Modifiers

Lookup

Bucket interface

Hash policy

Observers

Non-member functions

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions