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'DrIFT' is a type sensitive preprocessor for Haskell. It extracts type declarations and directives from modules and applies rules to them which generate code. 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 separate modules to that containing the type declaration. This lets instances be derived for a type after the original module has been compiled. Simple utility functions can also be produced from a type.


User manual available in PostScript format from

Related Projects


LicenseVerified byVerified onNotes
X11Janet Casey1 June 2004

Leaders and contributors

John Meacham Maintainer
Joost Visser Contributor
Malcolm Wallace Contributor
Noel Winstanley Contributor

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 15 October 2007.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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