Re: Good Ada Style For Impossible Actions?

[tmoran@acm.org]

A mouse outside a particular screen area is not an impossible action.
What should your particular program that is asking for mouse position do
in that case?  Is this an error - the program shouldn't be asking about
position in those circumstances?  Is it OK, and the legitimate space of
mouse positions for that program consists of the set of points inside the
rectangle, plus the single "outside the rectangle" 'point'?  Perhaps the
program should simply go dormant, ie the Ask_Position function shouldn't
return, until the mouse moves into its window area?