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fixpoint lib solver propagators not_equal.ex
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lib/solver/propagators/not_equal.ex

defmodule CPSolver.Propagator.NotEqual do
use CPSolver.Propagator
def new(x, y, offset \\ 0) do
new([x, y, offset])
end
@impl true
def variables(args) do
args
|> Propagator.default_variables_impl()
|> Enum.map(fn var -> set_propagate_on(var, :fixed) end)
end
@impl true
def filter([x, y]) do
filter([x, y, 0])
end
def filter([x, y, offset]) do
filter(x, y, offset)
end
def filter(x, y, offset \\ 0) do
cond do
fixed?(x) ->
remove(y, plus(min(x), -offset))
fixed?(y) ->
remove(x, plus(min(y), offset))
true ->
:stable
end
end
end