template-default: declaring Default instances just got even easier
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
Downloads
- template-default-0.1.2.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
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Versions [RSS] | 0.1, 0.1.1, 0.1.2 |
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Dependencies | base (>=3 && <6), data-default, template-haskell (>=2.4 && <2.11) [details] |
License | BSD-3-Clause |
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 |
Uploaded | by DanielWagner at 2016-06-03T05:31:47Z |
Distributions | |
Reverse Dependencies | 1 direct, 0 indirect [details] |
Downloads | 2274 total (5 in the last 30 days) |
Rating | (no votes yet) [estimated by Bayesian average] |
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Status | Docs not available [build log] All reported builds failed as of 2016-11-24 [all 3 reports] |