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scalascala-2.11

classOf[] for a higher-kinded type


Given class Foo[F[_]], how do I get the Class object? The usual syntax doesn't work:

scala> classOf[Foo[_]]
<console>:9: error: _$1 takes no type parameters, expected: one
              classOf[Foo[_]]
                          ^

Neither does

scala> classOf[Foo[_[_]]]
<console>:9: error: _$1 does not take type parameters
              classOf[Foo[_[_]]]
                          ^

Solution

  • Ah, right. Leaving this in case someone looks for it:

    scala> classOf[Foo[F] forSome { type F[_] }]
    warning: there were 1 feature warning(s); re-run with -feature for details
    res0: Class[Foo[_[_] <: Any]] = class Foo