Re: [MirageOS-devel] Remove DEVICE.connect?

[Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx>]

>>>> So, I propose removing connect from the type signatures (but keeping
>>>> it in the implementations). Then, being given a device only implies
>>>> the ability to use it, not the ability to create more devices.
>> 
>> Can you still easily compose devices together if you don't have a way to 
>> connect? Who will be responsible for calling the implementation-dependant 
>> connect function? Only the mirage tool in main.ml? (I guess that's already 
>> the case)
> 
> Yes, code that wants to call connect (such as the generated main.ml)
> has to know the concrete module type. But this is already the case,
> because the "id" types are all abstract in V1_LWT.

indeed, the mirage tool already has to deal with id of various types, so the 
changes you are proposing should be fine (and saner).

> It will also mean we can use other signatures for connect (e.g.
> allowing multiple arguments or optional arguments) if needed.

That's indeed a good argument. If we don't expose the connect fonction, we can 
use more complex function creators when needed - that's good (and we already 
kind of quite do that, for instance to init the http stack where we need to 
construct callbacks in main.ml)
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