[Tinyos-host-mote-wg] Re: [Tinyos-2.0wg] Bug in nesC 1.2alpha10

[Philip Levis]

On May 20, 2005, at 2:07 PM, Cory Sharp wrote:

> Just for the record... A reasonable alternative is to define generic
> components of the form MyComponent(max_clients) instead of
> MyComponent(special_string).  In practice, instantiation of those
> components looks like
>
>     new MyComponent(uniqueCount(special_string))
>
> instead of
>
>     new MyComponent(special_string)
>
> This is what the timer system does for VirtualizeTimerC and it works
> fine.  I even assert this should be the standard practice since the
> max_clients form seems more general.  The special_string form doesn't
> provide any additional abstraction for the use-cases I've heard so
> far.

I'm uncertain on this one.

On one hand, passing an integer is more flexible from a caller  
standpoint. On the other, it is less flexible for the callee. For  
example, a component can't include another unique() (e.g., for a null  
or termination element) which it wants included in the uniqueCount().

My feeling is that components which expect to be accessed with unique 
() keys through a parameterized interface should take a string, while  
almost everything else should take an integer.

But this is the sort of thing that's easy to change, so we can figure  
it out as 2.x fleshes out.

Phil

-------

"We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time."

- T. S. Eliot,  'Little Gidding'

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