> Alain Cremieux wrote:
> I am trying to build a functional firewall generator. The first part
> describes the available protections (kernel, anti-address spoofing, etc.).
> The second desribes every protocol, and the necessary rules if the
> corresponding service is enabled (e.g. open the http po
Jon Fairbairn wrote :
> Hi,
> I am trying to create an overloaded function "à la Java" to be able to
> call it either with a string or a number.
> Ex :
> definePort "http"
> definePort 80
> but I have problem with restrictions in Haskell's type system
> Is there a better solution ?
If we knew /w
> Jon Fairbairn <[EMAIL PROTECTED]> writes:
>
> > data Port = Tcpmux | Nbp | Echo_ddp | Rje | Zip | Echo_tcp | ...
> > deriving Enum, ...
> > instance Num Port where ...
>
> Or, alternatively, just use Strings, and have a portFromString first
> check /etc/services for a match, then
Jon Fairbairn <[EMAIL PROTECTED]> writes:
> data Port = Tcpmux | Nbp | Echo_ddp | Rje | Zip | Echo_tcp | ...
> deriving Enum, ...
> instance Num Port where ...
Or, alternatively, just use Strings, and have a portFromString first
check /etc/services for a match, then try to parse the
> Hi,
> I am trying to create an overloaded function "à la Java" to be able to
> call it either with a string or a number.
> Ex :
> definePort "http"
> definePort 80
> but I have problem with restrictions in Haskell's type system
> Is there a better solution ?
If we knew /why/ you wanted to do t
The problem is that you might have:
instance Poly Double where ...
and then when you say:
po 5
it doesn't know whether this is an Int or a Double.
writing
po (5::Int)
should be sufficient.
--
Hal Daume III
"Computer science is no more about computers| [EMAIL PROTECTED]
than astrono
Hi,
I am trying to create an overloaded function "à la Java" to be able to
call it either with a string or a number.
Ex :
definePort "http"
definePort 80
but I have problem with restrictions in Haskell's type system (or with
my lack of experience with it).
The program :
data PolyType = MkPolyLef
