ghc-monoidal-containers

Containers with monoidal accumulation

Containers with merging via monoidal accumulation. The 'Monoid' instances provided by the 'containers' and 'unordered-containers' packages merge structures in a left-biased manner instead of using the underlying monoidal structure of the value. This package wraps the types provided by these packages, but provides 'Monoid' instances implemented in terms of the value type's 'mappend'. For instance, the 'Monoid' 'Map' instance looks like, ' instance (Ord k, Monoid a) =>Monoid (MonoidalMap k a) '.

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