Mapping for containers with two element types.

The main groups of signatures provided by this module are:

Extensions for containers.

Extension signatures for containers.

Simultaneous mapping and filtering.

Signatures for filter-mapping.

Non-monadic mapping.

Signatures for (non-monadic) mapping.

Generic monad extensions.

Monad transformer signatures.

Haskell-style state monads.

Haskell-style state transformers.

Signatures and functors for containers and data structures that can be mapped across with a monadic side-effect.

The main groups of signatures provided by this module are:

Generic type signatures.