#4887: add a Location interface for element-wise operations on Data.Map
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Reporter: ross | Owner:
Type: proposal | Status: new
Priority: normal | Component: libraries (other)
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Old description:
> This is a variant of a suggestion by apfelmus:
>
> http://www.haskell.org/pipermail/libraries/2010-September/014510.html
>
> To avoid proliferation of variants of element-wise operations, the idea
> is to split these operations into two phases mediated by a new Location
> type, so that users can do whatever they like between these phases.
> Documentation is here:
>
> http://code.haskell.org/~ross/containers_doc/Data-Map.html#3
>
> This adds a type and 9 functions to the interface, but makes possible
> monadic updates and much more. As an illustration, the file
> {{{MapOps.hs}}} attached to the ticket gives definitions of 30 of the
> public functions of Data.Map in terms of the new interface. At least in
> the case of insert, this definition is slightly faster than the current
> one.
>
> Discussion period: 4 weeks (to 4 February)
New description:
This is a variant of a suggestion by apfelmus:
http://www.haskell.org/pipermail/libraries/2010-September/014510.html
To avoid proliferation of variants of element-wise operations, the idea is
to split these operations into two phases mediated by a new Location type,
so that users can do whatever they like between these phases.
Documentation is here:
http://code.haskell.org/~ross/containers_doc/Data-Map.html#3
This adds a type and 9 functions to the interface, but makes possible
monadic updates and much more. As an illustration, the file
{{{MapOps.hs}}} attached to the ticket gives definitions of 30 of the
public functions of Data.Map in terms of the new interface. ~~At least in
the case of insert, this definition is slightly faster than the current
one.~~
Discussion period: 4 weeks (to 4 February)
--
Comment(by ross):
Strike speed claim.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4887#comment:2>
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