# Bx

Bitmap index !

## Installation

Add this line to your application's Gemfile:

```ruby
gem 'bx'
```

And then execute:

    $ bundle install

Or install it yourself as:

    $ gem install bx

## Usage

```ruby
# prepare
bx = Bx.new

# set bits
bx['drama'] = 91
# ...
bx['movie'] = 187
# ...
bx['action'] = 437
# ...
bx['comedy'] = 437

# bitwise
ids = bx['drama'] & (bx['action'] | bx['comedy'])

# enumerate from high to low
ids.highest_one_bits.each{ ... }

# enumerate from low to high
ids.lowest_one_bits.each{ ... }
```

## Development

After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).

## Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/bx. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/[USERNAME]/bx/blob/master/CODE_OF_CONDUCT.md).


## License

The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).

## Code of Conduct

Everyone interacting in the Bx project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the [code of conduct](https://github.com/[USERNAME]/bx/blob/master/CODE_OF_CONDUCT.md).