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Navigator: consider to work around problems with adapting IterSource

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- as it stands currently, IterSource has a design problem, (see #1125)
- and due to common problems in C++ with mix-ins and extended super interfaces,
  it is surprisingly tricky to build on an extension of IterSource
- thus the idea is to draft a new solution "in green field"
  by allowing TreeExplorer to adapt IterSource automatically
- the new sholution should be templated on the concrete sub interface
  and ideally even resolve the mix-in-problem by re-linearising the
  inheritance line, i.e. replace WrappedLumieraIter by something
  able to wrap its source, in a similar vein as TreeExplorer does
This commit is contained in:
Fischlurch 2017-12-23 01:59:31 +01:00
parent 9f171682ce
commit 95b5786798
2 changed files with 56 additions and 0 deletions
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34
tests/library/iter-tree-explorer-test.cpp
View file

@ -272,6 +272,7 @@ namespace test{
verify_combinedExpandTransform();
verify_FilterIterator();
verify_asIterSource();
verify_IterSource();
verify_depthFirstExploration();
demonstrate_LayeredEvaluation();
@ -848,6 +849,39 @@ namespace test{
/** @test ability to wrap and handle IterSource based iteration
*
*/
void
verify_IterSource()
{
class PrivateSource
// : public IterSource<uint> /////////////////////////////////////TODO linearised Mix-in problem
{
public:
virtual PrivateSource* expandChildren() const =0;
};
class VerySpecivicIter
: public WrappedLumieraIter<NumberSequence>
, public PrivateSource
{
public:
VerySpecivicIter(uint start)
: WrappedLumieraIter(NumberSequence{start})
{ }
virtual PrivateSource*
expandChildren() const override
{
return new VerySpecivicIter{*wrappedIter() - 1};
}
};
UNIMPLEMENTED ("directly wrap and handle IterSource sub-interfaces");
}
/** @test use a preconfigured exploration scheme to expand depth-first until exhaustion.
* This is a simple extension where all elements are expanded automatically. In fact, the
* `expandChildren()` operation implies already an iteration step, namely to dispose of the

22
wiki/thinkPad.ichthyo.mm
View file

@ -8081,6 +8081,28 @@
<node CREATED="1513986085162" ID="ID_1791331544" MODIFIED="1513986090214" TEXT="von au&#xdf;en daran kommen"/>
<node CREATED="1513986090946" ID="ID_668980524" MODIFIED="1513986103340" TEXT="und auch noch downcasten auf TreeStructureNavigator"/>
</node>
<node CREATED="1513988678091" ID="ID_787175675" MODIFIED="1513988732759" TEXT="Pragmatismus-Trip">
<icon BUILTIN="idea"/>
<node CREATED="1513988687617" ID="ID_1652718385" MODIFIED="1513988692411" TEXT="nicht jetzt l&#xf6;sen">
<icon BUILTIN="yes"/>
</node>
<node CREATED="1513988694704" ID="ID_1570679085" MODIFIED="1513988710933" TEXT="das w&#xe4;re ein Komplett-Umbau von IterSource">
<icon BUILTIN="messagebox_warning"/>
</node>
<node COLOR="#174e54" CREATED="1513988715838" ID="ID_1398933111" MODIFIED="1513989057765" TEXT="stattdessen: Vorentwurf auf die gr&#xfc;ne Wiese">
<arrowlink COLOR="#1f9aa8" DESTINATION="ID_1242119956" ENDARROW="Default" ENDINCLINATION="87;-111;" ID="Arrow_ID_662359263" STARTARROW="None" STARTINCLINATION="-259;16;"/>
<font ITALIC="true" NAME="SansSerif" SIZE="12"/>
<icon BUILTIN="licq"/>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513988744665" HGAP="27" ID="ID_1242119956" MODIFIED="1513989064956" TEXT="vorl&#xe4;ufige IterSource-Integration" VSHIFT="12">
<linktarget COLOR="#1f9aa8" DESTINATION="ID_1242119956" ENDARROW="Default" ENDINCLINATION="87;-111;" ID="Arrow_ID_662359263" SOURCE="ID_1398933111" STARTARROW="None" STARTINCLINATION="-259;16;"/>
<icon BUILTIN="flag-yellow"/>
<node CREATED="1513988930537" ID="ID_594152265" MODIFIED="1513988942954" TEXT="kann selbst&#xe4;ndig Iterator-Front-End bauen"/>
<node CREATED="1513988952901" ID="ID_1668656742" MODIFIED="1513988971647" TEXT="dieses Front-End hat Zugang zum konkreten Sub-Interface"/>
<node CREATED="1513988974179" ID="ID_900695722" MODIFIED="1513989005434" TEXT="Funktoren k&#xf6;nnen dieses Sub-Interface akzeptieren und liefern"/>
<node CREATED="1513989030587" ID="ID_1529167083" MODIFIED="1513989044189" TEXT="TreeExplorer &#xfc;bernimmt / wrappt / packt aus"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1513962765760" ID="ID_795911284" MODIFIED="1513963084358" TEXT="Demo-Impl mit GenNode-Tree">