private[this]object MMMap extends HashMap[A, Set[B]] with MultiMap[A, B]
How convert it to immutable?
private[this]object MMMap extends HashMap[A, Set[B]] with MultiMap[A, B] How convert it to immutable?
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private[this]object MMMap extends HashMap[A, Set[B]] with MultiMap[A, B]
How convert it to immutable?
The immutable hierarchy doesn’t contain a MultiMap, so you won’t be able to use the converted structure with the same convenient syntax. But if you’re happy to deal with key/valueset pairs, then:
If you just want a mutable
HashMap, you can just usex.toMapin 2.8 orcollection.immutable.Map(x.toList: _*)in 2.7.But if you want the whole structure to be immutable–including the underlying set!–then you have to do more: you need to convert the sets along the way. In 2.8:
In 2.7: