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