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Define a HasDeclaration instance in terms of strategies.

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This commit is contained in:
Rob Rix 2017-10-04 12:35:14 -04:00
parent 5ab89d2850
commit e30fe8f9bf
1 changed files with 3 additions and 1 deletions
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4
src/Renderer/TOC.hs
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@ -1,4 +1,4 @@
{-# LANGUAGE DataKinds, MultiParamTypeClasses, RankNTypes, TypeFamilies, TypeOperators, ScopedTypeVariables #-}
{-# LANGUAGE DataKinds, MultiParamTypeClasses, RankNTypes, TypeFamilies, TypeOperators, ScopedTypeVariables, UndecidableInstances #-}
module Renderer.TOC
( renderToCDiff
, renderToCTerm
@ -95,6 +95,8 @@ data Declaration
class HasDeclaration f where
toDeclaration :: f a -> Maybe Declaration
instance (DeclarationStrategy f ~ strategy, HasDeclarationWithStrategy strategy f) => HasDeclaration f where
toDeclaration = toDeclarationWithStrategy (undefined :: proxy strategy)
data Strategy = Default | Custom