#9816: Add function for size-checked conversion of Integral types -------------------------------------+------------------------------------- Reporter: spl | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Based on the discussion in [http://thread.gmane.org/gmane.comp.lang.haskell.libraries/23338 this thread], I would like to add a function to the {{{base}}} library that is similar to {{{fromIntegral}}} but only successful if the argument fits in the result type. If possible, I would like to get this into 7.10. My apologies for running late on it. Hopefully, since it is a relatively small change overall, the "only" controversy will be bikeshedding. I have concluded that adding @hvr's {{{intCastMaybe}}} from [http://hackage.haskell.org/package/int-cast int-cast] is the best possible option. Previously, I thought a {{{Bounded}}}-based version was also useful; however, I realized that it did not deal properly with conversions like {{{Int<->Word}}}/{{{Int8<->Word8}}}/etc. as well as {{{intCastMaybe}}} and would need specialized versions that {{{intCastMaybe}}} provides automatically. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9816 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler