#8712: Data.Ix missing info on row/column major indexing -------------------------------------+------------------------------------- Reporter: mirpa | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.6.3 Resolution: | Keywords: row, column, Operating System: Unknown/Multiple | major, Ix Type of failure: Documentation | Architecture: Unknown/Multiple bug | Difficulty: Easy (less than 1 Test Case: | hour) Blocking: | Blocked By: | Related Tickets: -------------------------------------+------------------------------------- Comment (by rwbarton): Um, there's absolutely nothing wrong with using Ix and Array with multidimensional arrays (though the poster is not using Array anyways). Anyways, the Haskell 2010 (or 98) Report does specify that the Ix instance for `(a,b)` uses row-major order (though the wording is awkward: an instance for a built-in type is normally not called "derived"), so I agree that information should appear in the haddocks for Data.Ix somewhere. Incidentally there is a broken link at the end of http://hackage.haskell.org/package/base-4.6.0.1/docs/Data-Ix.html which ought to point to the relevant part of the Report, but as I mentioned "Deriving Instances of Ix" is not an intuitive section to look at for the instance `(a,b)`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8712#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler