Giacomo Tesio Shamar
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| {-# LANGUAGE ExistentialQuantification #-} | |
| -- This file is a direct translation of the example for the Visitor pattern from | |
| -- Wikipedia [1] to Haskell | |
| -- | |
| -- The Visitor pattern essentially tackles two dispatching problems: | |
| -- | |
| -- 1. double dispatching | |
| -- 2. dispatching subtypes | |
| -- | |
| -- While double dispatching of static types could be solved in Haskell by using |