extractable-singleton (empty) → 0.0.0

raw patch · 5 files changed

+79/−0 lines, 5 filesdep +basesetup-changed

Dependencies added: base

Files

• LICENSE +30/−0
• README.md +1/−0
• Setup.hs +2/−0
• extractable-singleton.cabal +24/−0
• src/Data/Singleton/Class.hs +22/−0

@@ -0,0 +1,30 @@+Copyright Author name here (c) 2017++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * Redistributions in binary form must reproduce the above+      copyright notice, this list of conditions and the following+      disclaimer in the documentation and/or other materials provided+      with the distribution.++    * Neither the name of Author name here nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

@@ -0,0 +1,1 @@+# extractable-singleton

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,24 @@+name:                extractable-singleton+version:             0.0.0+synopsis:            A functor, where the "stored" value is isomorphic to Identity+-- description:+homepage:            https://github.com/athanclark/extractable-singleton#readme+license:             BSD3+license-file:        LICENSE+author:              Athan Clark+maintainer:          athan.clark@gmail.com+copyright:           2017 Athan Clark+category:            Data+build-type:          Simple+extra-source-files:  README.md+cabal-version:       >=1.10++library+  hs-source-dirs:      src+  exposed-modules:     Data.Singleton.Class+  build-depends:       base >= 4.8 && < 5+  default-language:    Haskell2010++source-repository head+  type:     git+  location: https://github.com/athanclark/extractable-singleton

@@ -0,0 +1,22 @@+{-# LANGUAGE+    KindSignatures+  #-}++module Data.Singleton.Class where++import Data.Functor.Identity (Identity (..))++++class Extractable (f :: * -> *) where+  runSingleton :: f a -> a+++instance Extractable ((,) e) where+  runSingleton (_,x) = x++instance Extractable ((,,) w s) where+  runSingleton (_,_,x) = x++instance Extractable Identity where+  runSingleton (Identity x) = x