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add_con(+Constraint, ++Options, +Handle)
Add a constraint to the fd and linear solvers
- A numerical constraint, with functor
'=:=', '>=', '=<', '>' or '<'
- An options structure
- A linear solver handle
If the inequality is strict, X>Y or X'<'Y, then the granularity
specified in the options is added to the smaller term to create a non-strict
inequality, which can be passed to the linear solver. Thus if the granularity
is 3, then for X>Y the constraint X>=Y+3 is added to the
linear solver and X#>=Y+3 is added to the fd solver.
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