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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
//
// ClAbstractVariable.h
#ifndef ClAbstractVariable_H
#define ClAbstractVariable_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 <cstdio> /* for sprintf */
#include "Cassowary.h"
#include "ClErrors.h"
#include <memory>
#include <string>
#include <iostream>
#include "cl_auto_ptr.h"
using std::string;
using std::ostream;
class ClAbstractVariable {
public:
ClAbstractVariable(string Name = "") :
_name(Name), _pv(0)
{
++iVariableNumber;
#ifdef CL_FIND_LEAK
++cAbstractVariables;
#endif
if (Name.length() == 0)
{
char sz[16];
sprintf(sz,"v%ld",iVariableNumber);
_name = string(sz);
}
}
ClAbstractVariable(long varnumber, char *prefix) :
_pv(0)
{
cl_auto_ptr<char> pch (new char[16+strlen(prefix)]);
iVariableNumber++;
#ifdef CL_FIND_LEAK
++cAbstractVariables;
#endif
sprintf(pch.get(),"%s%ld",prefix,varnumber);
_name = string(pch.get());
}
virtual ~ClAbstractVariable()
#ifdef CL_FIND_LEAK
{ --cAbstractVariables; }
static long cAbstractVariables;
#else
{ }
#endif
// Return the Name of the variable
string Name() const
{ return _name; }
// Set the Name of the variable
virtual void SetName(string const &Name)
{ _name = Name; }
// Return true iff this variable is a ClFloatVariable
virtual bool IsFloatVariable() const
{ return false; }
// Return true iff this variable is a ClFDVariable
virtual bool IsFDVariable() const
{ return false; }
// Return true if this a dummy variable (used as a marker variable
// for required equality constraints). Such variables aren't
// allowed to enter the basis when pivoting.
virtual bool IsDummy() const
{ return false; }
// Return true if this a variable known outside the solver.
// (We need to give such variables a Value after solving is complete.)
virtual bool IsExternal() const
{ return false; }
// Return true if we can Pivot on this variable.
virtual bool IsPivotable() const
{ throw ExCLTooDifficultSpecial("Variable not usable inside SimplexSolver"); return false; }
// Return true if this is a restricted (or slack) variable. Such
// variables are constrained to be non-negative and occur only
// internally to the simplex solver.
virtual bool IsRestricted() const
{ throw ExCLTooDifficultSpecial("Variable not usable inside SimplexSolver"); return false; }
#ifndef CL_NO_IO
// Prints a semi-descriptive representation to the stream, using the
// Name if there is one, and otherwise the hash number of this
// object.
// EXAMPLES
// x[10.0] -- w/ Name
// x[0.0,100] -- w/ Name, bounds but no Value yet
// CV#345(10.0) -- w/o Name
virtual ostream &PrintOn(ostream &xo) const = 0;
friend ostream& operator<<(ostream &xos, const ClAbstractVariable &clv)
{ clv.PrintOn(xos); return xos; }
#endif // CL_NO_IO
friend bool operator<(const ClAbstractVariable &cl1, const ClAbstractVariable &cl2)
{ return &cl1 < &cl2; }
friend bool operator==(const ClAbstractVariable &cl1, const ClAbstractVariable &cl2)
{
return &cl1 == &cl2;
}
friend bool operator!=(const ClAbstractVariable &cl1, const ClAbstractVariable &cl2)
{
return !(cl1 == cl2);
}
virtual Number Value() const { return 0; }
virtual int IntValue() const { return 0; }
virtual void SetValue(Number)
{ assert(false); }
virtual void ChangeValue(Number)
{ assert(false); }
void SetPv(void *pv)
{ _pv = pv; }
void *Pv() const
{ return _pv; }
private:
string _name;
static long iVariableNumber;
// C-style extension mechanism so I
// don't have to wrap ScwmClVariables separately
void *_pv;
};
typedef ClAbstractVariable *PClAbstractVariable;
#endif
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