108 lines
2.5 KiB
C++
108 lines
2.5 KiB
C++
/*
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* Domain.h
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* @brief Domain restriction constraint
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* @date Feb 13, 2012
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* @author Frank Dellaert
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*/
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#pragma once
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#include <gtsam_unstable/discrete/Constraint.h>
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#include <gtsam/discrete/DiscreteKey.h>
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namespace gtsam {
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/**
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* Domain restriction constraint
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*/
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class Domain: public Constraint {
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size_t cardinality_; /// Cardinality
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std::set<size_t> values_; /// allowed values
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public:
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typedef boost::shared_ptr<Domain> shared_ptr;
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// Constructor on Discrete Key initializes an "all-allowed" domain
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Domain(const DiscreteKey& dkey) :
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Constraint(dkey.first), cardinality_(dkey.second) {
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for (size_t v = 0; v < cardinality_; v++)
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values_.insert(v);
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}
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// Constructor on Discrete Key with single allowed value
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// Consider SingleValue constraint
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Domain(const DiscreteKey& dkey, size_t v) :
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Constraint(dkey.first), cardinality_(dkey.second) {
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values_.insert(v);
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}
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/// Constructor
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Domain(const Domain& other) :
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Constraint(other.keys_[0]), values_(other.values_) {
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}
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/// insert a value, non const :-(
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void insert(size_t value) {
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values_.insert(value);
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}
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/// erase a value, non const :-(
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void erase(size_t value) {
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values_.erase(value);
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}
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size_t nrValues() const {
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return values_.size();
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}
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bool isSingleton() const {
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return nrValues() == 1;
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}
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size_t firstValue() const {
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return *values_.begin();
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}
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// print
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virtual void print(const std::string& s = "") const;
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bool contains(size_t value) const {
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return values_.count(value)>0;
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}
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/// Calculate value
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virtual double operator()(const Values& values) const;
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/// Convert into a decisiontree
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virtual operator DecisionTreeFactor() const;
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/// Multiply into a decisiontree
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virtual DecisionTreeFactor operator*(const DecisionTreeFactor& f) const;
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/*
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* Ensure Arc-consistency
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* @param j domain to be checked
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* @param domains all other domains
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*/
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bool ensureArcConsistency(size_t j, std::vector<Domain>& domains) const;
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/**
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* Check for a value in domain that does not occur in any other connected domain.
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* If found, we make this a singleton... Called in AllDiff::ensureArcConsistency
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* @param keys connected domains through alldiff
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*/
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bool checkAllDiff(const std::vector<Index> keys, std::vector<Domain>& domains);
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/// Partially apply known values
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virtual Constraint::shared_ptr partiallyApply(
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const Values& values) const;
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/// Partially apply known values, domain version
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virtual Constraint::shared_ptr partiallyApply(
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const std::vector<Domain>& domains) const;
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};
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} // namespace gtsam
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