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lumiera_documentation/wiki/thinkPad.ichthyo.mm
Ichthyostega d92878876a WIP: attempt to define the object builder invocation chain 
TODO still unresolved issues with the bootstrap.
Looks like we shall not initiate from the basic Rec(),
but reather require an explicit construction.
2015-08-16 01:35:30 +02:00

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d.h. der usage context entscheidet, ob wir einen Wert,
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eine Referenz oder einen konstanten Wert verwenden
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Record selber ist immuable
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aber hat eine Builder-Mechanik
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eigentlich fehlte nur die get()-Operation
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<node CREATED="1435932714261" ID="ID_1395890846" MODIFIED="1435932719281" TEXT="gleiches Problem schon bei Variant"/>
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ich hatte damals beim Variant und zugeh&#246;rigen Buffer die Sorge,
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da&#223; ich die Implikationen einer generischen L&#246;sung nicht durchdringen kann.
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Und ich wollte keine Zeit auf einen exzessiven Unit-Test verwenden
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generische L&#246;sung verschoben <font color="#990033">#963</font>
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C++11 erlaubt <b>=default</b>
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Zweck: kompaktes Anschreiben
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von literalen Daten
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Object <b>builder</b>
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<p>
Problem ist, wir definieren den Typ Record generisch,
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verwenden dann aber nur die spezialisierung Record&lt;GenNode&gt;
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Und die Builder-Funktionen brauchen eigentlich spezielles Wissen &#252;ber den zu konstruierenden Zieltyp
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<p>
Ergebnis move
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<font size="1">pro / contra</font>
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<richcontent TYPE="NOTE"><html>
<head>
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<p>
Move ist <b>gef&#228;hrlich </b>
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aber auch deutlich effizienter,
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<p>
denn wir m&#252;ssen sonst das ganze erzeugte Ergebnis einmal kopieren.
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Nicht sicher, ob der Optimiser das hinbekommt
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scheidet aus, wegen Wertsemantik
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<p>
mit <i>speziellem </i>Ref-Typ
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<font size="1">-- im DataCap</font>
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<head>
</head>
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<p>
hei&#223;t: in der Diff-Verarbeitung wird dieser spezielle check verwendet
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<node CREATED="1434128779661" ID="ID_1739097548" MODIFIED="1434236311060" TEXT="marker-ID + string-Payload">
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<node CREATED="1434128917125" ID="ID_392407967" MODIFIED="1434238970157" TEXT="&quot;fehlkonstruierte&quot; ID + pr&#xfc;f-Pr&#xe4;dikat"/>
<node CREATED="1434128981381" ID="ID_101281763" MODIFIED="1434236527554" TEXT="spezielle Ref-Payload">
<richcontent TYPE="NOTE"><html>
<head>
</head>
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<p>
m.E. die einzig saubere Desgin-Variante!
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<richcontent TYPE="NOTE"><html>
<head>
</head>
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<p>
hei&#223;t: wird direkt von standard-equality so behandelt
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<p>
brauche speziellen Builder,
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<p>
der das so fabriziert
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<richcontent TYPE="NODE"><html>
<head>
</head>
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<p>
bekomme einen
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<p>
&quot;ungenutzten&quot; DataCap
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<richcontent TYPE="NODE"><html>
<head>
</head>
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<p>
Idee: <font color="#990033"><b>Ref-GenNode</b></font>
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als Ref erkennbar
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<p>
<font size="1">(Pr&#228;dikat)</font>
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</html></richcontent>
</node>
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<richcontent TYPE="NODE"><html>
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</head>
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hash-identische
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<p>
Ziel-ID ableitbar
</p>
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<node CREATED="1434206509201" ID="ID_717222987" MODIFIED="1434206522117" TEXT="nur Ref-Fall zahlt Overhead"/>
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</node>
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<p>
Verarbeiten
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<p>
von Teilb&#228;umen
</p>
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</node>
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