lens-family

Lens Families

Version on this page:	1.2.3
LTS Haskell 22.39:	2.1.3
Stackage Nightly 2024-10-31:	2.1.3
Latest on Hackage:	2.1.3

See all snapshots lens-family appears in

BSD-3-Clause licensed by Russell O'Connor

Maintained by Russell O'Connor

This version can be pinned in stack with:lens-family-1.2.3@sha256:b5ae2994a2423e3ba532840cc040579f69bdb155a32bb822daa1cf892ad64036,1721

Module documentation for 1.2.3

Lens
- Lens.Family2

Depends on 5 packages(full list with versions):

base, containers, lens-family-core, mtl, transformers

Used by 6 packages in lts-14.27(full list with versions):

lens-simple, proto-lens, proto-lens-arbitrary, proto-lens-protobuf-types, proto-lens-protoc, proto-lens-runtime

This package provides first class functional references. In addition to the usual operations of getting, setting and composition, plus integration with monad state, lens families provide some unique features:

Polymorphic updating
Traversals
Cast projection functions to read-only lenses
Cast "toList" functions to read-only traversals
Cast semantic editor combinators to modify-only traversals.