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Constraint Programming Solver
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lib/solver/objective/objective.ex
defmodule CPSolver.Objective do
alias CPSolver.Objective.Propagator, as: ObjectivePropagator
alias CPSolver.Variable.Interface
import CPSolver.Variable.View.Factory
@spec minimize(Variable.t() | View.t()) :: %{
:propagator => Propagator.t(),
:variable => Variable.t() | View.t(),
:bound_handle => reference()
}
def minimize(variable) do
bound_handle = init_bound_handle()
propagator = ObjectivePropagator.new(variable, bound_handle)
%{
propagator: propagator,
variable: variable,
bound_handle: bound_handle
}
end
def maximize(variable) do
minimize(minus(variable))
end
def get_bound(%{bound_handle: handle}) do
get_bound(handle)
end
def get_bound(handle) when is_reference(handle) do
:atomics.get(handle, 1)
end
def update_bound(bound_handle, value) do
case :atomics.exchange(bound_handle, 1, value) do
prev_value when prev_value >= value ->
value
prev_value ->
# previous value lesser that the new one - set it back
update_bound(bound_handle, prev_value)
end
end
def tighten(%{variable: variable, bound_handle: handle} = _objective) do
tighten(variable, handle)
end
def tighten(variable, bound_handle) do
update_bound(bound_handle, Interface.max(variable) - 1)
end
def init_bound_handle() do
ref = :atomics.new(1, signed: true)
:atomics.put(ref, 1, :atomics.info(ref).max)
ref
end
def bind_to_store(%{variable: variable} = objective, store) do
Map.put(objective, :variable, Interface.bind(variable, store))
end
end