I think you need an approach that:
(a) simply doesn't let you construct data with conflicts -- such
constraints would be enforced by the data type constructors and "update"
functions, and
(b) deal with "update" by creating a new structure that is a modified
version of some existing structure.
On Sat, 12 Jul 2003 07:47:02 -0700 (PDT)
Ron de Bruijn <[EMAIL PROTECTED]> wrote:
>
> It's ofcourse possible to put a list of Subjects that
> a Teacher teaches in the data declaration of the
> teacher. But then there is no way of saying
> efficiently (O(1) Just a pointer or index):"Give me a
Hi there,
I was almost certain that Haskell was a great language
until I wanted to make a real usefull program and got
the following problem.
I have
data Lesson = Lesson Teacher SomeOtherProperties
deriving Show
data Subject = Subject Name [Teacher]
SomeOtherProperties
deriving Show
d
