object record
Record operations on HList
's with field-like elements.
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- object Record extends Dynamic
Records encoded as
HLists
of their value types intersected with the singleton types of their keys.Records encoded as
HLists
of their value types intersected with the singleton types of their keys.Record types may be written using a relatively concise syntax thanks to a trick due to Denys Shabalin (@den_sh) and Eugene Burmako (@xeno_by). We use a combination of
selectDynamic
and backticks to embed a type in a path which appears to the compiler as stable,type Xyz = Record.`'x -> Int, 'y -> String, 'z -> Boolean`.T
The use of singleton-typed
Symbols
as keys would make this type extremely laborious to write out by hand.There is also a mechanism for creating values of record types using Scala's named argument syntax. Values of the type just defined can be created as follows,
val xyz = Record(x = 23, y = "foo", z = true) xyz('y) // == "foo"