Split Capabilities: Making Capabilities Scale

[Ben Laurie]

Ralph Hartley wrote:
> 
> > > > and would not let von Braun use the object to count down to launch.
> > > > He could if the definition was "The do method decreases the
> > > > value of the
> > > > count by 1.  Launch occurs when the count reaches 0.".
> 
> If I were on Braun I would never accept that as a contract for a
> countdown object. He needs at least :
> 
> The count is a non-negative integer that is initially ten.
> When on Braun uses his decrement message the count decreases by
>   at most one.
> The count will never decrease at any other time.
> If the count is less than ten and the count has
>   decreased in the last second the count will
>   not decrease.
> Whenever the count decreases to a value less than ten
>   the new value is broadcast on the PA system (so that
>   everyone can hear).
> Launch may occur when the count reaches 0.

I'm strongly reminded of the Monty Python "Holy Hand Grenade" skit.

Cheers,

Ben.

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