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On Jan 12, 2007, at 12:31 AM, felix winkelmann wrote:
On 1/11/07, minh thu <[EMAIL PROTECTED]> wrote:
>
> Could you elaborate on this? Do you want to let the user specify
the
> actual record type, or it's contents?
The record type.
Say mailbox use a list-based queue implementation (so 'mailbox' in
the
following sentences is a hypothetical one).
Could I provide another implementation of a queue to be used by
mailbox?
Or could the author of mailbox make it possible by providing
different
implementations ?
I don't know module systems but maybe my question is wheter we can
parametrize a module when loading (instanciating ?) it.
Well, this is what is called "functors" in SML, for example:
parameterized
modules. You provide a module implementing the operations on
a specific datatype and pass this module to your mailbox module.
A (very basic) implementation of such functors is in the "lexmod" egg:
http://chicken.wiki.br/lexmod
The 'levenshtein' egg has a generic algorithm, it works w/ strings or
vectors. It uses the facilities of 'procedure-surface' to provide the
appropriate procedures.
cheers,
felix
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