Getting type parameter of a weak type in a macro implementation [duplicate]

StackOverflow https://stackoverflow.com/questions/19268725

  •  30-06-2022
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Question

In a macro impl[A: c.WeakTypeTag], if I find that c.weakTypeOf[A] <:< typeOf[Option[Any]], how do I get the type parameter of the Option? E.g., when A is Option[String], I need to find String.

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Solution

Same problem as here:

c.asInstanceOf[TypeRefApi].args.head
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