149 lines
3.3 KiB
C++
149 lines
3.3 KiB
C++
/*-----------------------------------------------------------------------------
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| Copyright (c) 2013-2017, Nucleic Development Team.
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| Distributed under the terms of the Modified BSD License.
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| The full license is in the file LICENSE, distributed with this software.
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|----------------------------------------------------------------------------*/
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#pragma once
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#include <ostream>
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#include <map>
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#include <vector>
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#include "expression.h"
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#include "shareddata.h"
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#include "strength.h"
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#include "term.h"
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#include "variable.h"
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namespace kiwi
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{
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enum RelationalOperator
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{
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OP_LE,
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OP_GE,
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OP_EQ
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};
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static std::ostream& operator<< (std::ostream& o, RelationalOperator op)
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{
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switch (op) {
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case OP_LE:
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o << "<=";
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break;
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case OP_GE:
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o << ">=";
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break;
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case OP_EQ:
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o << "==";
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break;
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}
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return o;
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}
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class Constraint
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{
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public:
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Constraint() : m_data(0) {}
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Constraint(const Expression &expr,
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RelationalOperator op,
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double strength = strength::required) : m_data(new ConstraintData(expr, op, strength)) {}
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Constraint(const Constraint &other, double strength) : m_data(new ConstraintData(other, strength)) {}
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~Constraint() {}
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const Expression &expression() const
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{
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return m_data->m_expression;
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}
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RelationalOperator op() const
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{
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return m_data->m_op;
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}
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double strength() const
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{
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return m_data->m_strength;
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}
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bool operator!() const
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{
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return !m_data;
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}
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bool involves (Variable const & v) const {
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if (expression().involves (v)) {
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return true;
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}
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return false;
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}
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private:
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static Expression reduce(const Expression &expr)
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{
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std::map<Variable, double> vars;
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typedef std::vector<Term>::const_iterator iter_t;
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iter_t end = expr.terms().end();
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for (iter_t it = expr.terms().begin(); it != end; ++it)
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vars[it->variable()] += it->coefficient();
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std::vector<Term> terms(vars.begin(), vars.end());
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return Expression(terms, expr.constant());
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}
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class ConstraintData : public SharedData
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{
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public:
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ConstraintData(const Expression &expr,
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RelationalOperator op,
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double strength) : SharedData(),
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m_expression(reduce(expr)),
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m_strength(strength::clip(strength)),
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m_op(op) {}
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ConstraintData(const Constraint &other, double strength) : SharedData(),
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m_expression(other.expression()),
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m_strength(strength::clip(strength)),
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m_op(other.op()) {}
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~ConstraintData() {}
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Expression m_expression;
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double m_strength;
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RelationalOperator m_op;
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private:
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ConstraintData(const ConstraintData &other);
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ConstraintData &operator=(const ConstraintData &other);
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};
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SharedDataPtr<ConstraintData> m_data;
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friend bool operator<(const Constraint &lhs, const Constraint &rhs)
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{
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return lhs.m_data < rhs.m_data;
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}
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friend bool operator==(const Constraint &lhs, const Constraint &rhs)
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{
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return lhs.m_data == rhs.m_data;
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}
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friend bool operator!=(const Constraint &lhs, const Constraint &rhs)
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{
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return lhs.m_data != rhs.m_data;
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}
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};
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static std::ostream& operator<< (std::ostream& o, kiwi::Constraint const & c)
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{
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return o << c.expression() << " OP " << c.op();
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}
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} // namespace kiwi
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