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/* $Id$
From: "Anthony Beurive'" <beurive@labri.u-bordeaux.fr>
Subject: cassowary
To: gjb@cs.washington.edu
Date: Tue, 9 Mar 1999 12:42:24 +0100 (CET)
I believe there's a bug in cassowary. It seems to be related to the
previous one I encountered a while ago, concerning the removal of
constraints.
The three following examples may help you to track the bug, I hope.
--------------------------------------------------------------------------------
#include "Cl.h"
void main()
{
ClSimplexSolver *solver = new ClSimplexSolver();
ClVariable *var = new ClVariable();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),1.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
--------------------------------------------------------------------------------
This works fine.
Now, the factor of the stay constraint is changed.
--------------------------------------------------------------------------------
#include "Cl.h"
void main()
{
ClSimplexSolver *solver = new ClSimplexSolver();
ClVariable *var = new ClVariable();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),2.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
--------------------------------------------------------------------------------
The result is:
test2: ClSimplexSolver.cc:1199: void ClSimplexSolver::Optimize(class ClVariable): Assertion \
`pzRow != __null' failed.
Aborted
Now, the solver is created after the variable.
--------------------------------------------------------------------------------
#include "Cl.h"
void main()
{
ClVariable *var = new ClVariable();
ClSimplexSolver *solver = new ClSimplexSolver();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),2.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
--------------------------------------------------------------------------------
This works again.
Can you reproduce the same results? Maybe the cause is my c++
compiler (egcs-2.90.29 980515 (egcs-1.0.3 release)). I don't know.
*/
#include <cassowary/Cl.h>
void foo1()
{
ClSimplexSolver *solver = new ClSimplexSolver();
ClVariable *var = new ClVariable();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),1.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
void foo2()
{
ClSimplexSolver *solver = new ClSimplexSolver();
ClVariable *var = new ClVariable();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),2.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
void foo3()
{
ClVariable *var = new ClVariable();
ClSimplexSolver *solver = new ClSimplexSolver();
ClStayConstraint *stcn = new ClStayConstraint(*var,ClsWeak(),2.0);
solver->AddConstraint(*stcn);
cout << *solver;
solver->RemoveConstraint(*stcn);
cout << *solver;
}
int main()
{
cerr << "Test1: " << endl;
foo1();
cerr << "\nTest2: " << endl;
foo2();
cerr << "\nTest3: " << endl;
foo3();
}
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