Program to derive type class instances.

Data.Derive http://hackage.haskell.org/package/derive is good another solution for DrFIT. But DrFIT is Haskell 98 compliant, derive is not.

DrIFT is a type sensitive preprocessor for Haskell. It extracts type declarations and directives from modules. The directives cause rules to be fired on the parsed type declarations, generating new code which is then appended to the bottom of the input file. The rules are expressed as Haskell code, and it is intended that the user can add new rules as required.

DrIFT automates instance derivation for classes that aren't supported by the standard compilers. In addition, instances can be produced in seperate modules to that containing the type declaration. This allows instances to be derived for a type after the original module has been compiled. As a bonus, simple utility functions can also be produced from a type.

This package was cabalized by gwern [email protected].

DrIFT

This package contains a source distribution of DrIFT, a tool for automatic derivation of Haskell class instances. DrIFT was formerly known as Derive.

The original homepage is at http://repetae.net/john/computer/haskell/DrIFT/. But this DrIFT package has some changes with original DrIFT.

Contents of this package:

• src: Directory with the source files of the DrIFT tool
• example: Directory with examples of using the DrIFT tool
• docs: Documentation

How to install

To configure and install DrIFT from the source tarball

$ autoreconf -i
$ ./configure
$ make cabal-install