The template-default package

Declaring instances of the Default type class has always been pretty mechanical. This package makes the compiler do the mechanical bit. This has the benefit that even less thought is required, and the instance will automatically be corrected when the definition of the data type changes (say, to add more arguments to the constructor). Usage looks like this, for example:

 (-# LANGUAGE TemplateHaskell #-)
 import Data.Default.TH
 data List a = Nil | Cons a (List a)
 deriveDefault ''List

This example results in the following instance:

 instance Data.Default.Default (List a_ad2) where
   Data.Default.def = Nil

Properties

Versions	0.1, 0.1.1
Dependencies	base (≥3 & <6), data-default, template-haskell (≥2.4 & <2.9)
License	BSD3
Copyright	Daniel Wagner 2012
Author	Daniel Wagner
Maintainer	Daniel Wagner <daniel@wagner-home.com>
Category	Data
Home page	https://github.com/haskell-pkg-janitors/template-default
Upload date	Thu Mar 21 22:10:24 UTC 2013
Uploaded by	GregoryCollins
Built on	ghc-7.6

Modules

Data
- Default
  - Data.Default.TH

Downloads

template-default-0.1.1.tar.gz (Cabal source package)
package description (included in the package)