The flexible-defaults package
Template Haskell code to implement default implementations for type-class functions based on which functions are already implemented. Currently extremely crude but still fairly effective.
When defining a type class with many functions, each of which can be implemented based on arbitrary subsets of the others, the standard default-implementation concept breaks down quite badly. This library provides a system by which more complex rules can be described for choosing default implementations based on which ones the user supplies. These implementations can additionally be given "suitability scores", so that when multiple possible choices could be made, the library can choose the "best" one.
Changes in v0.0.0.3: Added a hack to fix under GHC 7.2.
Changes in v0.0.0.2: Nothing at all except setting 'buildable: False' under GHC 7.2.1.
|Versions||0.0.0.1, 0.0.0.2, 0.0.0.3, 0.0.1.0, 0.0.1.1, 0.0.1.2|
|Dependencies||base (>=3 && <5), containers, template-haskell, th-extras, transformers [details]|
|Author||James Cook <email@example.com>|
|Maintainer||James Cook <firstname.lastname@example.org>|
|Category||Code Generation, Template Haskell|
|Source repository||head: git clone https://github.com/mokus0/flexible-defaults.git|
|Uploaded||Tue Nov 15 14:52:38 UTC 2011 by JamesCook|
|Distributions||Debian:0.0.1.1, LTSHaskell:0.0.1.2, NixOS:0.0.1.2, Stackage:0.0.1.2, Tumbleweed:0.0.1.2|
|Downloads||4943 total (53 in the last 30 days)|
|Status||Docs uploaded by user
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