103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
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// $Id$
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#include <cassowary/Cl.h>
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/* This bug fixed --02/15/99 gjb
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Replaced the parallel vectors for edit constraints
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(the errorPlus..., errorMinus..., prevEditConstants vectors)
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with a ClEditInfo class that is the Value of the _editVarMap map.
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Later I realized that I need to go to a _editVars list so that
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multiple edits on the same variable that nest are handled properly.
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--09/19/99 gjb
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*/
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int main()
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{
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ClSimplexSolver solver;
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ClVariable x("x",7);
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ClVariable y("y",8);
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ClVariable z("z",9);
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solver
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.AddStay(x)
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.AddStay(y)
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.AddStay(z);
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try {
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solver.AddEditVar(x);
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solver.AddEditVar(y);
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solver.AddEditVar(z);
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solver.BeginEdit();
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solver.SuggestValue(x,1);
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solver.SuggestValue(z,2);
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solver.RemoveEditVar(y);
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solver.SuggestValue(x,3);
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solver.SuggestValue(z,4);
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solver.EndEdit();
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} catch (ExCLError &e) {
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cerr << e.description() << endl;
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}
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cout << x << endl << y << endl << z <<endl;
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}
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#if 0 /* Message below */
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From: "Michael Kaufmann" <Michael.Kaufmann@ubs.com>
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To: <noth@cs.washington.edu>
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Subject: bugreport
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Date: Thu, 1 Oct 1998 11:40:55 +0200
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Message-Id: <000001bded1f$973a2060$230e1fac@itc_mk.sbcs.swissbank.com>
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Mime-Version: 1.0
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Content-Type: text/plain;
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charset="iso-8859-1"
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Content-Transfer-Encoding: 7bit
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X-Priority: 3 (Normal)
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X-Msmail-Priority: Normal
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X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0
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Importance: Normal
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X-Mimeole: Produced By Microsoft MimeOLE V4.72.2106.4
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Dear Mr Noth,
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I am currently working with the Java implementation of Cassowary and found
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the following bug:
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If I Add several editConstraints, remove some of them again later and
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perform a 'ClSimplexSolver.SuggestValue()', the indices of
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'ClConstraintAndIndex' in the variable 'cai' are sometimes wrong (see
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ClSimplexSolver.SuggestValue(ClVariable v, double x), the 3rd line). This is
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because if you remove an element from a 'java.util.Vector', and the element
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is somewhere in the middle of the Vector, the indices of the Vector change.
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(see java.util.Vector.removeElementAt(int index):
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public final synchronized void removeElementAt(int index) {
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if (index >= elementCount) {
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throw new ArrayIndexOutOfBoundsException(index + " >= " +
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elementCount);
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}
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else if (index < 0) {
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throw new ArrayIndexOutOfBoundsException(index);
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}
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int j = elementCount - index - 1;
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if (j > 0) {
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System.arraycopy(elementData, index + 1, elementData, index, j);
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}
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elementCount--;
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elementData[elementCount] = null; /* to let gc do its work */
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}
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My workaround now is, that everytime when I remove an EditVariable from the
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Solver, I have to remove all the EditVariables and Add then the ones again,
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that I do not want to remove.
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#endif
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