0.8.0
-
Overhaul of FieldRec
: records with named fields. We now take advantage of the -XOverloadedLabels
extension to support referring to record fields by names such a #myField
.
-
A new ARec
type for constant-time field access. You can convert a classic, HList-like Rec
into an ARec
with toARec
, or back the other way with fromARec
. An ARec
uses an Array
to store record fields, so the usual trade-offs between lists and arrays apply: lists are cheap to construct by adding an element to the head, but slow to access; it is expensive to modify the shape of an array, but element lookup is constant-time.
Compatibility Break: The operator =:
for constructing a record with a single field has changed. That operation is now known as =:=
, while =:
is now used to construct an ElField
. It was decided that single-field record construction was not a common use-case, so the shorter name could be used for the more common operation. Apologies for making the upgrade a bit bumpy.
0.7.0
- Simplified
match
- Added
Data.Vinyl.Curry
0.6.0
Added a CoRec
(co-record) type constructed in the same style as the existing Rec
type for records. A CoRec
is an open sum type: a value of CoRec [a,b,c]
is either an a
, a b
, or a c
. In contrast a Rec [a,b,c]
includes an a
, a b
, and, a c
.
0.5.3
Added a concise Show
instance for Const
.
0.5.2
Ported the tutorial to haddocks (andrewthad)
0.5.1
Added utilities for working with the FieldRec
type.
0.5
Vinyl 0.5 combines the generality of Vinyl 0.4 with the ease-of-use of previous
versions by eschewing the defunctionalized type families and just using plain
type constructors; Vinyl 0.4-style records can be recovered in most cases in a
modular manner without baking it into the fabric of Vinyl itself.
Also new in 0.5 is a unified lens-based approach to subtyping, coercion and
projection.
0.4
Vinyl 0.4 is a big departure from previous versions, in that it introduces a
universe encoding as a means to generalize the space of keys from strings to
any arbitrary space. This means that you can have closed universes for your
records.
For details on how to use the new Vinyl, please see tests/Intro.lhs
or view
Jon’s talk at BayHac 2014, Programming in
Vinyl.