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Invocation: invoke the param-functors and build extension block

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Relying basically on the trick to invoke std::apply with a generic variadic Lambda
onto the tuple of functors; within the lambda we can use variadic expansion
to pass the results directly into the builder and so construct the param-tuple in-place.


Oh well.
2024 is almost gone by now.
Had to endure yet another performance of Beethoven's 9th symphony...
This commit is contained in:
Fischlurch 2024-12-29 23:55:19 +01:00
parent ee59162418
commit 107d03f6ef
3 changed files with 30 additions and 7 deletions
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8
src/steam/engine/param-weaving-pattern.hpp
View file

@ -113,9 +113,11 @@ namespace engine {
typename ChainCons::NewFrame
buildParamDataBlock (TurnoutSystem& turnoutSys)
{
auto invoke = [&](auto& fun) { return fun(turnoutSys); };
ParamTup params = lib::meta::mapEach(functors_, invoke);
//////////////////////////////////////////////////////////////OOO now need to extract them
return std::apply ([&](auto&&... paramFun)
{ // invoke parameter-functors and build NewFrame from results
return ChainCons::build (paramFun (turnoutSys) ...);
}
,functors_);
}

3
tests/core/steam/engine/node-feed-test.cpp
View file

@ -131,6 +131,9 @@ SHOW_EXPR(v0)
SHOW_EXPR(v1)
auto paramBlock = spec.buildParamDataBlock (turnoutSys);
SHOW_EXPR(paramBlock)
SHOW_EXPR(paramBlock.get<0>())
SHOW_EXPR(paramBlock.get<1>())
TODO ("implement a simple Builder for ParamAgent-Node");
TODO ("then use both together to demonstrate a param data feed here");

26
wiki/thinkPad.ichthyo.mm
View file

@ -94325,13 +94325,31 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
</node>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1735438743590" ID="ID_973914193" MODIFIED="1735438756220" TEXT="Storage-Tupel erzeugen">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1735492888686" ID="ID_810676585" MODIFIED="1735492933273" TEXT="Problem: Storage-Block is non-copyable">
<node COLOR="#338800" CREATED="1735438743590" ID="ID_973914193" MODIFIED="1735512420087" TEXT="Storage-Tupel erzeugen">
<icon BUILTIN="button_ok"/>
<node COLOR="#435e98" CREATED="1735492888686" ID="ID_810676585" MODIFIED="1735512377642" TEXT="Problem: Storage-Block is non-copyable">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1735512018597" ID="ID_1684262838" MODIFIED="1735512083855" TEXT="Konsequenz: k&#xf6;nnen ihn nicht aus dem Builder in das Turnout-System linken"/>
<node CREATED="1735512085990" ID="ID_1280269467" MODIFIED="1735512398065" TEXT="das war aber so zu erwarten (und ich habe das auch akzeptiert)"/>
<node CREATED="1735512107979" ID="ID_824666743" MODIFIED="1735512122317" TEXT="ohnehin passiert dieser Schritt im ParamWeavingPattern"/>
</node>
<node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1735492909340" ID="ID_1181823322" MODIFIED="1735492933273" TEXT="erzeugen / bef&#xfc;llen ist auch tricky">
<node COLOR="#435e98" CREATED="1735492909340" ID="ID_1181823322" MODIFIED="1735512377642" TEXT="erzeugen / bef&#xfc;llen ist auch tricky">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1735512137910" ID="ID_1638187110" MODIFIED="1735512154561" TEXT="deshalb gibt es aber auch diese Cons::build(elms...)-Funktion"/>
<node CREATED="1735512156404" ID="ID_1834538695" MODIFIED="1735512274921" TEXT="L&#xf6;sung: die tuple-Apply-Technik direkt anwenden">
<richcontent TYPE="NOTE"><html>
<head/>
<body>
<p>
also den gleichen Kniff, auf dem auch lib::meta::forEach und lib::meta::mapEach beruhen: man wendet per std::apply ein generisches variadisches Lambda auf die Tupel-Elemente an
</p>
</body>
</html></richcontent>
</node>
<node CREATED="1735512277618" ID="ID_207555501" MODIFIED="1735512290335" TEXT="spezieller Twist: hier liegen die Param-Funktoren im Tupel"/>
</node>
<node COLOR="#338800" CREATED="1735512457951" ID="ID_895202142" MODIFIED="1735512478967" TEXT="im Test best&#xe4;tigt: funktioniert &#x263b;">
<icon BUILTIN="button_ok"/>
</node>
</node>
</node>