[Haskell-cafe] APIs

[Jérémy Bobbio]

On Wednesday 25 May 2005 01:09, Daniel Fischer wrote:
> Am Mittwoch, 25. Mai 2005 00:46 schrieb Benjamin Franksen:
> > On Wednesday 25 May 2005 00:11, Jan-Willem Maessen wrote:
> > > On May 24, 2005, at 5:28 PM, John Meacham wrote:
> > > > [various ways of capturing options passed to functions
> > > > discussed...]
> > > >
> > > > data ParentsFlag = DontCreateParents | CreateParents
> > > >         deriving(Enum)
> > > >
> [more discussion...]
>
> What about a type synonym? I think
>
> type CreateParents = Bool

The thread started about readability at the call site.  Using a type 
synonym for Bool needs to figure out what this "True" at call site 
means instead of understanding it right away.

What about adding to the Daniel's definition:

  don'tCreateParents :: CreateParents
  don'tCreateParents = False
  createParents      :: CreateParents
  createParents      = True

I'm not finding this fancy as the library user is not required to use 
them.  Using constructors also emphasis which are options and which are 
not.

Cheers,
  Jérémy.
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