Hey Russell, is there any expository or tech reporty exposition of the
differences in formulation and the why's wherefores of the new major
release? (i'm genuinely curious since i'm quite wimpy in the lens foo)
On Fri, Jul 19, 2019 at 10:53 AM
In celebration of the 10th anniversary of Twan van Laarhoven's seminal blog post ``CPS based functional references''[1], I am releasing version 2.0 of lens-family[2] and lens-family-core[3] packages. This new release continues to explore the design of Van Laarhoven style optics with new support for adapters, grates, grids[4], and prisms.
To bring support to these new optics necessarily means moving a little further away from syntactic compatibility with Kmett's lens library. In particular, lens-family's 'under' is unrelated to Kmett's lens library's 'under' combinator. Nonetheless the 'under' combinator plays a crucial role in lens-family as a dual to the 'over' combinator and this naming is hard to resist despite the conflict.
This new version comes with some minor incompatibilities with the version 1.2 library that may require user updates. See https://hackage.haskell.org/package/lens-family-2.0.0/changelog.
[1]https://www.twanvl.nl/blog/haskell/cps-functional-references [2]https://hackage.haskell.org/package/lens-family-2.0.0 [3]https://hackage.haskell.org/package/lens-family-core-2.0.0 [4]A grid is an optic that is both a grate and a traversal.
-- Russell O'Connor http://r6.ca/ _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.