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move metafunction to GenNode

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because this is something of wider usage potential.
It allows us to detect if a type in question can be
placed within a GenNode
This commit is contained in:
Fischlurch 2016-03-24 21:32:56 +01:00
parent 92d4e87ab9
commit 2098e69981
3 changed files with 106 additions and 27 deletions
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25
src/lib/diff/gen-node.hpp
View file

@ -457,6 +457,31 @@ namespace diff{
/**
* metafunction to detect types able to be wrapped into a GenNode.
* Only a limited and fixed set of types may be placed within a GenNode,
* as defined through the typelist `lib::diff::DataValues`. This metafunction
* allows to enable or disable specialisations and definitions based on the
* fact if a type in question can live within a GenNode.
*/
template<typename ELM>
struct can_wrap_in_GenNode
{
using Yes = lib::meta::Yes_t;
using No = lib::meta::No_t;
template<class X>
static Yes check(typename variant::CanBuildFrom<X, DataValues>::Type*);
template<class X>
static No check(...);
public:
static const bool value = (sizeof(Yes)==sizeof(check<ELM>(0)));
};
/* === iteration / recursive expansion === */

15
src/lib/diff/tree-mutator-collection-binding.hpp
View file

@ -383,21 +383,8 @@
};
using lib::meta::Yes_t;
using lib::meta::No_t;
using lib::meta::enable_if;
template<typename ELM>
struct can_wrap_in_GenNode
{
template<class X>
static Yes_t check(typename lib::variant::CanBuildFrom<X, lib::diff::DataValues>::Type*);
template<class X>
static No_t check(...);
public:
static const bool value = (sizeof(Yes_t)==sizeof(check<ELM>(0)));
};
using lib::diff::can_wrap_in_GenNode;
template<typename ELM, typename SEL =void>

93
wiki/thinkPad.ichthyo.mm
View file

@ -611,8 +611,7 @@
Mutator verwendet einen <i>Binder</i>
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1458408965770" ID="ID_1892856741" MODIFIED="1458409828754" TEXT="jeweiliger Client implementiert den Binder"/>
<node CREATED="1458409675740" ID="ID_1319191337" MODIFIED="1458409828754" TEXT="Implementierung direkt durch Typsystem geleitet">
@ -2347,8 +2346,7 @@
da&#223; sich alle relevanten Eigenschaften darstellen lassen
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1458176911161" ID="ID_1565618197" MODIFIED="1458176946748">
<richcontent TYPE="NODE"><html>
@ -2363,8 +2361,7 @@
dann wird es wohl so sein, da&#223; sie auch nicht gebraucht wird
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<node CREATED="1458176947972" ID="ID_1901451299" MODIFIED="1458176965869" TEXT="Beispiel: primitive Werte sind eben kein sub-Scope"/>
<node CREATED="1458176966665" ID="ID_1292201640" MODIFIED="1458176981459" TEXT="Beispiel: immutable elements sind eben nicht zuweisbar"/>
</node>
@ -2392,8 +2389,7 @@
sofern es gelingt, die funktionalit&#228;t gutm&#252;tig zu degradieren.
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
</node>
</node>
@ -2412,11 +2408,11 @@
<node CREATED="1458178288690" ID="ID_562189277" MODIFIED="1458178295494" TEXT="Implementierung">
<icon BUILTIN="pencil"/>
<node CREATED="1458178298328" ID="ID_1964300614" MODIFIED="1458178300324" TEXT="Builder">
<node CREATED="1458325962991" ID="ID_1955400674" MODIFIED="1458325972586" TEXT="Typ definitionen schwierig anzuschreiben"/>
<node CREATED="1458325962991" ID="ID_1955400674" MODIFIED="1458850234904" TEXT="Typ-Definitionen schwierig anzuschreiben"/>
<node CREATED="1458325973486" ID="ID_1711903796" MODIFIED="1458325992405" TEXT="Code ziemlich redundant und undurchsichtig">
<icon BUILTIN="messagebox_warning"/>
</node>
<node CREATED="1458326045724" ID="ID_338749301" MODIFIED="1458326138100" TEXT="Typ-Check erst sehr sp&#xe4;t">
<node CREATED="1458326045724" ID="ID_338749301" MODIFIED="1458850242859" TEXT="Typ-Check erst sehr sp&#xe4;t">
<richcontent TYPE="NOTE"><html>
<head>
@ -2435,11 +2431,28 @@
eine wom&#246;glich irref&#252;hrende Meldung generiert
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<arrowlink DESTINATION="ID_428365633" ENDARROW="Default" ENDINCLINATION="176;0;" ID="Arrow_ID_1501436647" STARTARROW="None" STARTINCLINATION="176;0;"/>
</node>
</node>
<node CREATED="1458178300984" ID="ID_1152672899" MODIFIED="1458178309971" TEXT="Binding-Layer">
<node CREATED="1458850722203" ID="ID_1565475995" MODIFIED="1458850731470" TEXT="Fehler bei fehlender Funktionalit&#xe4;t">
<node CREATED="1458850733769" ID="ID_764229197" MODIFIED="1458850744620" TEXT="kein Setter"/>
<node CREATED="1458850746184" ID="ID_105803291" MODIFIED="1458850752370" TEXT="kein Mutator"/>
</node>
<node CREATED="1458850782747" ID="ID_1019140953" MODIFIED="1458850793430" TEXT="Umgang mit fehlendem Selector"/>
</node>
<node CREATED="1458850516270" ID="ID_263851499" MODIFIED="1458850519025" TEXT="Test">
<node CREATED="1458850521270" ID="ID_534213210" MODIFIED="1458850525041" TEXT="F&#xe4;lle">
<node CREATED="1458850526133" ID="ID_55717538" MODIFIED="1458850550109" TEXT="Binden an Sammlung aus Primitiven"/>
<node CREATED="1458850550705" ID="ID_1923906009" MODIFIED="1458850572315" TEXT="Binden an Sammlung aus Spezialtypen"/>
</node>
<node CREATED="1458850656668" ID="ID_307163685" MODIFIED="1458850658799" TEXT="Defaults">
<node CREATED="1458850660523" ID="ID_326530451" MODIFIED="1458850670269" TEXT="GenNode-Payload-Typ"/>
<node CREATED="1458850672705" ID="ID_1240263288" MODIFIED="1458850675197" TEXT="kein Setter"/>
<node CREATED="1458850675641" ID="ID_736176562" MODIFIED="1458850678564" TEXT="kein Mutator"/>
</node>
</node>
<node CREATED="1458178300984" ID="ID_1152672899" MODIFIED="1458178309971" TEXT="Binding-Layer"/>
</node>
</node>
<node CREATED="1457232746179" ID="ID_1793680066" MODIFIED="1457232776598" TEXT="Rec&lt;GenNode&gt;">
@ -2451,6 +2464,60 @@
<icon BUILTIN="full-3"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1458850101524" HGAP="-3" ID="ID_780586600" MODIFIED="1458850119531" TEXT="TODO" VSHIFT="23">
<font NAME="SansSerif" SIZE="14"/>
<icon BUILTIN="flag-yellow"/>
<node CREATED="1458850122091" ID="ID_15024219" MODIFIED="1458850140244" TEXT="Collection-Binding: bessere Fehlermeldungen">
<node CREATED="1458850141920" ID="ID_428365633" MODIFIED="1458850242859" TEXT="bei Signatur-Mismatch">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...denn es ist sehr verwirrend, welche Signatur denn nun die Lambdas haben m&#252;ssen
</p>
</body>
</html>
</richcontent>
<linktarget COLOR="#a9b4c1" DESTINATION="ID_428365633" ENDARROW="Default" ENDINCLINATION="176;0;" ID="Arrow_ID_1501436647" SOURCE="ID_338749301" STARTARROW="None" STARTINCLINATION="176;0;"/>
</node>
<node CREATED="1458850154575" ID="ID_725958518" MODIFIED="1458850180914" TEXT="wenn der Default-Mater greift">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...denn es kann keinen Default-Matcher geben....
</p>
</body>
</html>
</richcontent>
</node>
</node>
<node CREATED="1458850212503" ID="ID_321552356" MODIFIED="1458850218977" TEXT="Signaturen f&#xfc;r Lambdas dokumentieren"/>
<node CREATED="1458850263688" ID="ID_555018476" MODIFIED="1458850272315" TEXT="Zusammenf&#xfc;hren">
<node CREATED="1458850294083" ID="ID_393704697" MODIFIED="1458850302901" TEXT="der normale GenNode-Applikator"/>
<node CREATED="1458850282285" ID="ID_435722140" MODIFIED="1458850293735" TEXT="Pr&#xfc;fen ob sinnvoll">
<node CREATED="1458850328775" ID="ID_1736970011" MODIFIED="1458850333475" TEXT="Indirektionen"/>
<node CREATED="1458850334110" ID="ID_1313695007" MODIFIED="1458850338898" TEXT="Speicherbedarf"/>
<node CREATED="1458850339413" ID="ID_476682196" MODIFIED="1458850359702" TEXT="Aufwand bei der Verwendung"/>
</node>
<node CREATED="1458850306506" ID="ID_425272158" MODIFIED="1458850323212" TEXT="durch Binding f&#xfc;r Tree-Applikator ersetzen"/>
</node>
<node CREATED="1458850387823" ID="ID_415691337" MODIFIED="1458850394506" TEXT="allgemein">
<node CREATED="1458850397158" ID="ID_1336568549" MODIFIED="1458850405665" TEXT="GenNode">
<node CREATED="1458850406396" ID="ID_1837583550" MODIFIED="1458850420054" TEXT="string-Repr&#xe4;sentation der Payload"/>
<node CREATED="1458850422587" ID="ID_1552868803" MODIFIED="1458850433820" TEXT="Metafunktion f&#xfc;r m&#xf6;gliche Payload"/>
</node>
<node CREATED="1458850437017" ID="ID_592865755" MODIFIED="1458850455074" TEXT="Planting-Handle">
<node CREATED="1458850456134" ID="ID_1020391699" MODIFIED="1458850463009" TEXT="Zwischenschicht einziehen im TreeMutator"/>
<node CREATED="1458850463389" ID="ID_769403943" MODIFIED="1458850470192" TEXT="Generische Impl herausl&#xf6;sen"/>
<node CREATED="1458850471228" ID="ID_167381938" MODIFIED="1458850476631" TEXT="Unit-Test hierf&#xfc;r"/>
</node>
</node>
</node>
</node>
</node>
<node CREATED="1448658726090" FOLDED="true" ID="ID_37610818" MODIFIED="1455421704674" TEXT="Commands" VSHIFT="4">