wrapped-generic-default (empty) → 0.1.0.0

raw patch · 4 files changed

+318/−0 lines, 4 filesdep +basedep +data-default-classdep +wrapped

Dependencies added: base, data-default-class, wrapped

Files

• CHANGELOG.md +3/−0
• LICENSE +202/−0
• src/Data/Wrapped/Default.hs +70/−0
• wrapped-generic-default.cabal +43/−0

@@ -0,0 +1,3 @@+# 0.1.0.0++Initial version.

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@@ -0,0 +1,70 @@+-- Copyright 2017-2021 Google LLC+--+-- Licensed under the Apache License, Version 2.0 (the "License");+-- you may not use this file except in compliance with the License.+-- You may obtain a copy of the License at+--+--      http://www.apache.org/licenses/LICENSE-2.0+--+-- Unless required by applicable law or agreed to in writing, software+-- distributed under the License is distributed on an "AS IS" BASIS,+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.+-- See the License for the specific language governing permissions and+-- limitations under the License.++-- | Provides instance @Default (Wrapped Generic a)@ for use with @DerivingVia@.++{-# OPTIONS_GHC -Wno-orphans #-}++{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE TypeOperators #-}+{-# LANGUAGE UndecidableInstances #-}++module Data.Wrapped.Default (GDefault(..)) where++import GHC.Generics+         ( Generic(..), M1(..), (:+:)(..), (:*:)(..), U1(..), K1(..)+         )++import Data.Default.Class (Default(..))+import Data.Wrapped (Wrapped(..))++-- | Generic instances for Default.+--+-- Exported just to give Haddock something to link to; use @Wrapped Generic@+-- with @-XDerivingVia@ instead.+class GDefault f where+  gdef :: f x++instance GDefault f => GDefault (M1 i m f) where+  gdef = M1 gdef++instance GDefault f => GDefault (f :+: g) where+  gdef = L1 gdef++instance (GDefault f, GDefault g) => GDefault (f :*: g) where+  gdef = gdef :*: gdef++instance GDefault U1 where+  gdef = U1++instance Default a => GDefault (K1 i a) where+  gdef = K1 def++-- | The first constructor with all fields set to 'def'.+--+-- Given the data type definition:+--+-- @+--     data Foo = Foo Int Bool | Bar Double+--       deriving Generic+--       deriving Default via Wrapped Generic Foo+-- @+--+-- then+--+-- @def = Foo def def :: Foo@, i.e. 'def' picks the first constructor and fills+-- it with 'def' calls.+instance (Generic a, GDefault (Rep a)) => Default (Wrapped Generic a) where+  def = Wrapped $ to gdef

@@ -0,0 +1,43 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.33.0.+--+-- see: https://github.com/sol/hpack+--+-- hash: e69f5685692812e04350f514b1a564d95ef67c59fb5bb18633ae8898a3cc5d6f++name:           wrapped-generic-default+version:        0.1.0.0+synopsis:       Provides an orphan instance Default (Wrapped Generic a)+description:    This provides support for Generic-based deriving of Default as an instance on+                Wrapped Generic, so that Default instances can be derived as+                "deriving Default via Wrapped Generic MyType".+category:       Generics+homepage:       https://github.com/google/hs-wrapped#readme+bug-reports:    https://github.com/google/hs-wrapped/issues+author:         Reiner Pope <reinerp@google.com>+maintainer:     Andrew Pritchard <awpr@google.com>+copyright:      2017-2021 Google LLC+license:        Apache-2.0+license-file:   LICENSE+build-type:     Simple+extra-source-files:+    CHANGELOG.md++source-repository head+  type: git+  location: https://github.com/google/hs-wrapped+  subdir: wrapped-generic-default++library+  exposed-modules:+      Data.Wrapped.Default+  other-modules:+      Paths_wrapped_generic_default+  hs-source-dirs:+      src+  build-depends:+      base >=4.12 && <4.16+    , data-default-class >=0.0 && <0.2+    , wrapped >=0.1 && <0.2+  default-language: Haskell2010