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The Haskell Unfolder Episode 39: deriving strategies
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The Haskell Unfolder Episode 39: deriving strategies
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Intermediate. Assumes working knowledge.
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Programming languagesHaskellLanguage design and type systems
The Haskell Unfolder explains the four different strategies GHC offers for deriving class instance definitions.
In this episode we'll discuss the the four different ways GHC offers for deriving class instance definitions: the classic "stock" deriving, generalised "newtype" deriving, as well as the "anyclass" and "via" strategies. For each of these, we'll explain the underlying ideas, use cases, and limitations.