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// $Id$
//
// Cassowary Incremental Constraint Solver
// Original Smalltalk Implementation by Alan Borning
// This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
// http://www.cs.washington.edu/homes/gjb
// (C) 1998, 1999 Greg J. Badros and Alan Borning
// See ../LICENSE for legal details regarding this software
//
// ClConstraint.h
#ifndef ClConstraint_H
#define ClConstraint_H
#if defined(HAVE_CONFIG_H) && !defined(CONFIG_H_INCLUDED) && !defined(CONFIG_INLINE_H_INCLUDED)
#include <cassowary/config-inline.h>
#define CONFIG_INLINE_H_INCLUDED
#endif
#include "debug.h"
#include "Cassowary.h"
#include "ClLinearExpression.h"
#include "ClStrength.h"
#include <string>
using std::string;
class ClSimplexSolver;
class ClFDSolver;
class ClBlueSolver;
// enum setup so additive inverse flips the direction of the inequality
enum ClCnRelation {cnEQ = 0, cnNEQ = 100, cnLEQ = 2, cnGEQ = -2, cnLT = 3, cnGT = -3 };
inline enum ClCnRelation
ReverseInequality(enum ClCnRelation c)
{
if (c != cnNEQ)
c = (enum ClCnRelation) (- int(c));
return c;
}
inline string
StrCnRelation(enum ClCnRelation rel) {
switch (rel) {
case cnEQ: return "=";
case cnNEQ: return "=/=";
case cnLEQ: return "<=";
case cnGEQ: return ">=";
case cnLT: return "<";
case cnGT: return ">";
default: assert(false);
}
}
class ClConstraint {
public:
ClConstraint(const ClStrength &strength = ClsRequired(), double weight = 1.0 ) :
_strength(strength),
_readOnlyVars(),
_weight(weight),
_pv(0),
_times_added(0)
{
CtrTracer(__FUNCTION__,this);
}
virtual ~ClConstraint()
{
DtrTracer(__FUNCTION__,this);
}
// Return my linear Expression. (For linear equations, this
// constraint represents Expression=0; for linear inequalities it
// represents Expression>=0.)
virtual ClLinearExpression Expression() const
{ assert(false); }
// Returns true if this is an edit constraint
virtual bool IsEditConstraint() const
{ return false; }
// Return true if this is an inequality constraint and
// false if it is an equality constraint. The default is
// that it is not.
virtual bool IsInequality() const
{ return false; }
virtual bool IsStrictInequality() const
{ return false; }
virtual bool IsRequired() const
{ return _strength.IsRequired(); }
virtual bool isStayConstraint() const
{ return false; }
virtual const ClStrength &strength() const
{ return _strength; }
virtual double weight() const
{ return _weight; }
#ifndef CL_NO_IO
virtual ostream &PrintOn(ostream &xo) const = 0;
friend ostream& operator<<(ostream &xos, const ClConstraint &constraint)
{ constraint.PrintOn(xos); return xos; }
#endif
void SetPv(void *pv)
{ _pv = pv; }
void *Pv() const
{ return _pv; }
virtual bool FIsSatisfied() const { return false; }
virtual bool FIsInSolver() const { return _times_added != 0; }
virtual bool FIsOkayForSimplexSolver() const { return true; }
void ChangeStrength( const ClStrength &strength)
{
if (_times_added == 0) {
setStrength(strength);
} else {
throw ExCLTooDifficult();
}
}
void ChangeWeight( double weight )
{
if (_times_added == 0) {
setWeight(weight);
} else {
throw ExCLTooDifficult();
}
}
bool FIsReadOnlyVar(ClVariable v) const {
return !(_readOnlyVars.find(v) == _readOnlyVars.end());
}
const ClVarSet &ReadOnlyVars() const {
return _readOnlyVars;
}
ClConstraint &AddROVars(const ClVarSet &setClv) {
for ( ClVarSet::const_iterator it = setClv.begin();
it != setClv.end(); ++it) {
_readOnlyVars.insert(*it);
}
return *this;
}
friend class ClSimplexSolver;
friend class ClFDSolver;
friend class ClBlueSolver;
private:
ClSymbolicWeight symbolicWeight() const {
return _strength.symbolicWeight();
}
void addedTo(const ClSimplexSolver &)
{ ++_times_added; }
void removedFrom(const ClSimplexSolver &)
{ --_times_added; }
void setStrength( const ClStrength &strength )
{ _strength = strength; }
void setWeight( double weight )
{ _weight = weight; }
/// instance variables
ClStrength _strength;
ClVarSet _readOnlyVars;
double _weight;
void *_pv;
int _times_added;
};
typedef ClConstraint* PClConstraint;
#endif
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