Christophe Plasschaert writes:
With erlang or haskell, can we play with or implement lower network fuction (routing daemon interacting with a kernel) [...]
I can't speak for Erlang, but in Haskell you can. Through the Foreign Function Interface, you can access arbitrary 3rd-party libraries or system calls, including pointer arithmetic and the wonders of memory management.
In terms of speed, is haskell good enough ?
You have C/C++'s performance for algorithms that do things the way you would do them in C. Once you start to rely on lazy evaluation, performance may be really good or really bad, depending on your algorithms. Practical experience suggests that writing efficient algorithms in a non-strict language is difficult at first. If you stay away from infinite lists that map to an I/O stream through lazy evaluation, however, you should be fine. ;-) Peter