sealed trait Union[R, A] extends AnyRef
Union represents one effect T[_] embedded in a tree of possible effects R
The effect tree is represented by four possible cases:
- fx1[T]
- fx2[T1, T2]
- fx3[T1, T2, T3]
- FxAppend[L, R]
The union type has three concrete constructors:
- UnionAppendL(nested: Union[L]): Union[FxAppend[L, R]]
- UnionAppendR(nested: Union[R]): Union[FxAppend[L, R]]
- UnionTagged(valueUnsafe: Any, index: Int): Union[R] (for R in fx1, fx2, fx3...) In that respect UnionTagged behaves similarly to a tagged union in C or C++.
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