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<br /><table class="width100" cellspacing="1"><tr><td class="form-title" colspan="6"><div class="center">ETSI's Bug Tracker - Ext Pack: Object-oriented features (ES 203 790)</div></td></tr><tr><td class="form-title" colspan="6">View Issue Details</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print-category"><td class="print" width="16%">ID</td><td class="print" width="16%">Project</td><td class="print" width="16%">Category</td><td class="print" width="16%">View Status</td><td class="print" width="16%">Date Submitted</td><td class="print" width="16%">Last Update</td></tr><tr class="print"><td class="print">0007871</td><td class="print">Ext Pack: Object-oriented features (ES 203 790)</td><td class="print">[All Projects] General</td><td class="print">public</td><td class="print">27-08-2019 15:15</td><td class="print">28-12-2020 13:44</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print"><td class="print-category">Reporter</td><td class="print">Jacob Wieland - Spirent</td><td class="print" colspan="4">&#160;</td></tr><tr class="print"><td class="print-category">Assigned To</td><td class="print">Jens Grabowski</td><td class="print" colspan="4">&#160;</td></tr><tr class="print"><td class="print-category">Priority</td><td class="print">normal</td><td class="print-category">Severity</td><td class="print">minor</td><td class="print-category">Reproducibility</td><td class="print">have not tried</td></tr><tr class="print"><td class="print-category">Status</td><td class="print">closed</td><td class="print-category">Resolution</td><td class="print">fixed</td><td class="print" colspan="2">&#160;</td></tr><tr class="print"><td class="print-category">Platform</td><td class="print"></td><td class="print-category">OS</td><td class="print"></td><td class="print-category">OS Version</td><td class="print"></td></tr><tr class="print"><td class="print-category">Product Version</td><td class="print">V1.2.1 (published 2020-05)</td><td class="print" colspan="4">&#160;</td></tr><tr><td class="print-category">Target Version</td><td class="print">V1.3.1 (ongoing)</td><td class="print-category">Fixed in Version</td><td class="print"></td><td class="print" colspan="2">&#160;</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr class="print"><td class="print-category">Summary</td><td class="print" colspan="5">0007871: Class templates to be added to the language?</td></tr><tr class="print"><td class="print-category">Description</td><td class="print" colspan="5">It should be investigated whether there are use cases that are facilitated by some class template mechanisms (outside which those that are already possible with the ones that we already have).</td></tr><tr class="print"><td class="print-category">Steps To Reproduce</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Additional Information</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Tags</td><td class="print" colspan="5">No tags attached.</td></tr><tr class="print"><td class="print-category">Relationships</td><td class="print" colspan="5"></td></tr><tr class="print"><td class="print-category">Attached Files</td><td class="print" colspan="5"><img src="http://oldforge.etsi.org/mantis/images/fileicons/doc.gif" alt="docx" />&#160;CR7871-1.docx (134,973) <span class="italic">11-12-2020 12:48</span><br />http://oldforge.etsi.org/mantis/file_download.php?file_id=3988&amp;type=bug<br /><img src="http://oldforge.etsi.org/mantis/images/fileicons/doc.gif" alt="docx" />&#160;CR7871-2.docx (136,182) <span class="italic">11-12-2020 13:21</span><br />http://oldforge.etsi.org/mantis/file_download.php?file_id=3990&amp;type=bug<br /><img src="http://oldforge.etsi.org/mantis/images/fileicons/doc.gif" alt="docx" />&#160;CR7871-3.docx (148,597) <span class="italic">11-12-2020 13:22</span><br />http://oldforge.etsi.org/mantis/file_download.php?file_id=3991&amp;type=bug<br /><img src="http://oldforge.etsi.org/mantis/images/fileicons/doc.gif" alt="docx" />&#160;CR7871-4.docx (148,246) <span class="italic">11-12-2020 13:30</span><br />http://oldforge.etsi.org/mantis/file_download.php?file_id=3992&amp;type=bug<br /><img src="http://oldforge.etsi.org/mantis/images/fileicons/doc.gif" alt="docx" />&#160;CR7871-5.docx (137,390) <span class="italic">11-12-2020 13:34</span><br />http://oldforge.etsi.org/mantis/file_download.php?file_id=3993&amp;type=bug</td></tr><tr><td class="print-spacer" colspan="6"><hr size="1" /></td></tr><tr><td class="form-title">Issue History</td></tr><tr class="print-category"><td class="row-category-history">Date Modified</td><td class="row-category-history">Username</td><td class="row-category-history">Field</td><td class="row-category-history">Change</td></tr><tr class="print"><td class="print">27-08-2019 15:15</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">New Issue</td><td class="print"></td></tr><tr class="print"><td class="print">27-08-2019 15:23</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Assigned To</td><td class="print"> =&gt; Jens Grabowski</td></tr><tr class="print"><td class="print">27-08-2019 15:23</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Status</td><td class="print">new =&gt; assigned</td></tr><tr class="print"><td class="print">17-12-2019 08:34</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015534</td><td class="print"></td></tr><tr class="print"><td class="print">10-12-2020 14:10</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015843</td><td class="print"></td></tr><tr class="print"><td class="print">10-12-2020 15:30</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015844</td><td class="print"></td></tr><tr class="print"><td class="print">10-12-2020 15:36</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Edited: 0015844</td><td class="print">bug_revision_view_page.php?bugnote_id=15844#r532</td></tr><tr class="print"><td class="print">11-12-2020 11:07</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=82">Jens Grabowski</a></td><td class="print">Assigned To</td><td class="print">Jens Grabowski =&gt; Jacob Wieland - Spirent</td></tr><tr class="print"><td class="print">11-12-2020 12:48</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">File Added: CR7871-1.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 12:49</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015850</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 12:49</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Assigned To</td><td class="print">Jacob Wieland - Spirent =&gt; Tomas Urban</td></tr><tr class="print"><td class="print">11-12-2020 12:50</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015851</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:05</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015852</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:06</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">File Added: CR7871-2.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:07</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015853</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:21</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">File Deleted: CR7871-2.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:21</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">File Added: CR7871-2.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:22</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">File Added: CR7871-3.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:22</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015854</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:23</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Note Added: 0015855</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:23</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Assigned To</td><td class="print">Tomas Urban =&gt; Jacob Wieland - Spirent</td></tr><tr class="print"><td class="print">11-12-2020 13:23</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Status</td><td class="print">assigned =&gt; confirmed</td></tr><tr class="print"><td class="print">11-12-2020 13:30</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">File Added: CR7871-4.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:34</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">File Added: CR7871-5.docx</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:35</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Assigned To</td><td class="print">Jacob Wieland - Spirent =&gt; Tomas Urban</td></tr><tr class="print"><td class="print">11-12-2020 13:35</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Status</td><td class="print">confirmed =&gt; assigned</td></tr><tr class="print"><td class="print">11-12-2020 13:35</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Note Added: 0015856</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:35</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a></td><td class="print">Status</td><td class="print">assigned =&gt; confirmed</td></tr><tr class="print"><td class="print">11-12-2020 13:40</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Note Added: 0015857</td><td class="print"></td></tr><tr class="print"><td class="print">11-12-2020 13:40</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Status</td><td class="print">confirmed =&gt; resolved</td></tr><tr class="print"><td class="print">11-12-2020 13:40</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Resolution</td><td class="print">open =&gt; fixed</td></tr><tr class="print"><td class="print">11-12-2020 13:40</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a></td><td class="print">Assigned To</td><td class="print">Tomas Urban =&gt; Jens Grabowski</td></tr><tr class="print"><td class="print">17-12-2020 16:17</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Product Version</td><td class="print"> =&gt; V1.2.1 (published 2020-05)</td></tr><tr class="print"><td class="print">17-12-2020 16:17</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=127">Gyorgy Rethy</a></td><td class="print">Target Version</td><td class="print"> =&gt; V1.3.1 (ongoing)</td></tr><tr class="print"><td class="print">28-12-2020 13:44</td><td class="print"><a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=82">Jens Grabowski</a></td><td class="print">Status</td><td class="print">resolved =&gt; closed</td></tr></table>
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				(0015534)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				17-12-2019 08:34&#160;&#160;&#160;
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				Interesting in this regard would be to look at Class patterns introduced by Java or Scala.			</td>
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				(0015843)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				10-12-2020 14:10&#160;&#160;&#160;
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				The only idea that I can come up with so far that is in sync with the design principles of TTCN-3 is to allow compound-assignment-notation as class templates. <br />
<br />
Only those fields that are to be constrained should have to be mentioned, all unmentioned fields should implicitly be 'don't care'. That way, a template for class A can also be used for all subclasses of A that add additional fields. Otherwise, you would always have to use the mofifies contruct like A:modifies ? := { ... } instead of simply A:{ ... }<br />
<br />
Only field members should be referenced on the left sides of the field assignments inside the compound assignment.<br />
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Example:<br />
<br />
type class Pair { var integer a, b }<br />
<br />
template Pair t := { a := (1 .. 20) }<br />
<br />
type class Triple extends Pair { var integer c }<br />
<br />
match(Triple.create(1,2,3), t) // returns true<br />
<br />
Additionally, method calls of non-void methods of the class could also be allowed on the left hand side of the assignment notation.<br />
<br />
For example:<br />
<br />
type class @abstract Shape { function @abstract area() return float; }<br />
<br />
template Shape smallShape := { area() := (0 .. 20.0) }<br />
<br />
smallShape would match for all objects whose class is derived from Shape and where the result of the method call to area() fulfills the constraint.<br />
<br />
For this extension, of course, multiple &quot;assignments&quot; for the same method shall be allowed in the compound assignment. As always, the semantics would be that for all assignments the constraint needs to be fulfilled so that the template matches.<br />
<br />
Drawback here is that empty templates that do not match anything can be declared, as in<br />
<br />
template Shape empty := { <br />
&#160;&#160;area() := (0.0 .. infinity), <br />
&#160;&#160;area() := {-infinity .. !0.0) <br />
}<br />
<br />
A similar such conflict can occur between an assignment of a field member and a method-call constraint.<br />
<br />
So, maybe this advanced assignment notation with method calls should only be added to the advanced matching package.			</td>
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				(0015844)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				10-12-2020 15:30&#160;&#160;&#160;
				<br />(edited on:&#32;10-12-2020 15:36)			</td>
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				Probably only non-private fields should be possible to be used in class templates, as otherwise, private fields could be implicitly accessed.<br />
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Maybe this should even only be allowed for public property fields (and public methods), i.e. those things that you can access from outside.<br />
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				(0015850)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 12:49&#160;&#160;&#160;
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				Please review first draft.			</td>
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				(0015851)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 12:50&#160;&#160;&#160;
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				TODO: BNF rules			</td>
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				(0015852)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 13:05&#160;&#160;&#160;
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				TODO: Delete the sentence that there are no object/class templates.			</td>
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				(0015853)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 13:07&#160;&#160;&#160;
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				Added second draft with additional restriction about object templates not being allowed to be used as values or converted into values.<br />
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Also added BNF rules (draft)			</td>
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				(0015854)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 13:22&#160;&#160;&#160;
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				Replaced draft 2 with version with simpler BNF change that also does not introduce BNF ambiguity by changing only the rule for FieldSpec			</td>
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				(0015855)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a>&#160;&#160;&#160;
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				11-12-2020 13:23&#160;&#160;&#160;
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				It seems fine to me. I only made two small changes, please check.			</td>
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				(0015856)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=508">Jacob Wieland - Spirent</a>&#160;&#160;&#160;
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				11-12-2020 13:35&#160;&#160;&#160;
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				ok, also added the deletion of the restriction that there are no class templates to the draft, please check and resolve, if ok			</td>
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				(0015857)
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				<a href="http://oldforge.etsi.org/mantis/view_user_page.php?id=659">Tomas Urban</a>&#160;&#160;&#160;
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				11-12-2020 13:40&#160;&#160;&#160;
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				Reviewed, no issues found. The proposal is ready to be added to the next version of the specification.			</td>
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