Re: [Haskell-cafe] class Bytestringable or ToBytestring
On 11/23/2012 08:19 AM, Silvio Frischknecht wrote: i recently found the convertible package Thanks. quite a cool package, I'll probably use it in the future for some of my programs. Not sure that's appropriate for my cases unfortunately. -- Vincent ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] class Bytestringable or ToBytestring
i recently found the convertible package http://hackage.haskell.org/packages/archive/convertible/1.0.11.1/doc/html/Data- Convertible-Base.html convert :: Convertible a b = a - b I've only used it once but it looks good to me. sure the type checker does not guartantee that you get a ByteString back but if you only use your own types where you write all the instances yourself you should be safe. silvio ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] class Bytestringable or ToBytestring
Hi cafe, I've been adding lots of types recently that looks more or less like: newtype A = A ByteString data B = B ByteString This is great for extra type safety and letting the compiler do its job, however getting the bytestring back requires boiler plate. At the moment either you give access to the constructor, which is not always wanted, or you use the record syntax to create a function to extract just the bytestring. The latter is fine for 1 or 2 types, but the scheme fall apart when having many of those types and do pollute namespace. I'm basically after something that looks like this: class ToByteString a where toByteString :: a - ByteString Before anyone suggest the Serialize interface from cereal or the Binary interface from binary which both looks quite similar (from far away): - serialize work in the put monad, and you have to define a get instance: which is something that is not required or possible sometime. - binary works with lazy bytestrings and got the same problem as cereal. - a serialize instance that just do a single putByteString is really slow: 12 ns to 329 ns (26x time slower) on the same exact data on one isolated bench) - neither of those packages are in the platform. If that doesn't exists, could it be a worthy addition to bytestring ? is this a good idea in general ? is there any other way ? Thanks, -- Vincent ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] class Bytestringable or ToBytestring
Why not use http://hackage.haskell.org/packages/archive/newtype/0.2/doc/html/Control-Newtype.html instead? On Thu, 22 Nov 2012 14:15:00 + Vincent Hanquez t...@snarc.org wrote: Hi cafe, I've been adding lots of types recently that looks more or less like: newtype A = A ByteString data B = B ByteString This is great for extra type safety and letting the compiler do its job, however getting the bytestring back requires boiler plate. At the moment either you give access to the constructor, which is not always wanted, or you use the record syntax to create a function to extract just the bytestring. The latter is fine for 1 or 2 types, but the scheme fall apart when having many of those types and do pollute namespace. I'm basically after something that looks like this: class ToByteString a where toByteString :: a - ByteString Before anyone suggest the Serialize interface from cereal or the Binary interface from binary which both looks quite similar (from far away): - serialize work in the put monad, and you have to define a get instance: which is something that is not required or possible sometime. - binary works with lazy bytestrings and got the same problem as cereal. - a serialize instance that just do a single putByteString is really slow: 12 ns to 329 ns (26x time slower) on the same exact data on one isolated bench) - neither of those packages are in the platform. If that doesn't exists, could it be a worthy addition to bytestring ? is this a good idea in general ? is there any other way ? Thanks, ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] class Bytestringable or ToBytestring
On 11/22/2012 03:42 PM, kudah wrote: Why not use http://hackage.haskell.org/packages/archive/newtype/0.2/doc/html/Control-Newtype.html instead? interesting i didn't know about it, however it's seems relatively unknown (can't find any library on hackage that use it) and just like Serialize and Binary the interface goes both way, where i'm looking only at the unpack method. -- Vincent ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] class Bytestringable or ToBytestring
On Thu, 22 Nov 2012 21:14:31 + Vincent Hanquez t...@snarc.org wrote: can't find any library on hackage that use it http://packdeps.haskellers.com/reverse/newtype ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
