 | derive-2.0.0: A program and library to derive instances for data types | Source code | Contents | Index |
| Data.Derive.Fold |
| makeFold :: Derivation | Source |
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| Description | |||||
| A pseudo derivation. Derive a (non-recursive) fold function for the type which takes one function per alternative constructor. Each function takes the same arguments as the constructor and returns a value. When applied to a value the fold function applies the function for the matching constructor to the constructor fields. This provides a first-class alternative to pattern matching to deconstruct the data type. | |||||
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| Produced by Haddock version 2.4.2 |