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BufferProvider: improve configuration of thread-local dispatch

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Since thread_local implies a static setup, we need a way how to
build a new service instance. Usually this would be a default construction,
yet there might be services with special init requirements.

Using an explicit template parameter for this setup configuration
allows to make the primary template parameter just the service itself,
which makes the default usage much clearer.
This commit is contained in:
Fischlurch 2026-04-18 16:25:14 +02:00
parent a06ef95e94
commit 9bd3e550dc
3 changed files with 56 additions and 15 deletions
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21
src/lib/local-slice.hpp
View file

@ -41,22 +41,29 @@
namespace lib { namespace lib {
/** Extension point for LocalSlice: Service initialisation */
template<class SRV>
struct LocalSlice_DefaultSetup
{
using Service = SRV;
static Service init() { return Service(); }
};
/** /**
* Common access point to thread-local service instances. * Common access point to thread-local service instances.
* @tparam CONF static config / setup to initialise the service. * @tparam CONF setup to initialise the service.
*/ */
template<class CONF> template<class SRV, class CONF =LocalSlice_DefaultSetup<SRV>>
class LocalSlice struct LocalSlice
{ {
using Service = CONF::Service;
public:
LocalSlice() = default; LocalSlice() = default;
// using default copy/assignment // using default copy/assignment
using Service = CONF::Service;
/** service access */ /** service access */
Service& Service&
operator*() const operator*() const

9
tests/lib/local-slice-test.cpp
View file

@ -57,14 +57,7 @@ namespace test {
} }
}; };
struct DummySetup using DummySlice = LocalSlice<DummyBackend>;
{
using Service = DummyBackend;
static Service init() { return Service(); }
};
using DummySlice = LocalSlice<DummySetup>;
/** /**

41
wiki/thinkPad.ichthyo.mm
View file

@ -144308,6 +144308,47 @@ StM_bind(Builder&lt;R1&gt; b1, Extension&lt;R1,R2&gt; extension)
<node CREATED="1776474854867" ID="ID_1487038882" MODIFIED="1776474859837" TEXT="CONF"> <node CREATED="1776474854867" ID="ID_1487038882" MODIFIED="1776474859837" TEXT="CONF">
<node CREATED="1776474861216" ID="ID_399712480" MODIFIED="1776474870435" TEXT="typedef Service"/> <node CREATED="1776474861216" ID="ID_399712480" MODIFIED="1776474870435" TEXT="typedef Service"/>
<node CREATED="1776474871327" ID="ID_142831800" MODIFIED="1776474879674" TEXT="eine init-Funktion"/> <node CREATED="1776474871327" ID="ID_142831800" MODIFIED="1776474879674" TEXT="eine init-Funktion"/>
<node COLOR="#338800" CREATED="1776518244557" ID="ID_69243918" MODIFIED="1776522105417" TEXT="Verbesserung : Setup f&#xfc;r Service-Typ">
<icon BUILTIN="button_ok"/>
<node CREATED="1776518286073" ID="ID_992160718" MODIFIED="1776518303060" TEXT="LocalSlice&lt;SRV&gt;"/>
<node CREATED="1776518303809" ID="ID_1039989287" MODIFIED="1776518323133" TEXT="normalerweise gen&#xfc;gt ein default-Setup-Template"/>
<node COLOR="#435e98" CREATED="1776518324108" ID="ID_1914807086" MODIFIED="1776522047530" TEXT="explizite Spezialisierung soll m&#xf6;glich sein">
<icon BUILTIN="yes"/>
<node CREATED="1776521876873" ID="ID_1636226712" MODIFIED="1776522039333" TEXT="puh ... das wird in jedem Fall h&#xe4;sslich">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
man mu&#223; den aktuellen Namespace schlie&#223;en, in lib gehen, dort die explizite Spezialisierung definieren...
</p>
</body>
</html>
</richcontent>
<icon BUILTIN="smiley-angry"/>
</node>
<node CREATED="1776521934417" ID="ID_130169122" MODIFIED="1776522032176" TEXT="L&#xf6;sung: 2.Template-Parameter mit Default-Init">
<icon BUILTIN="idea"/>
</node>
<node CREATED="1776521973780" ID="ID_1887344423" MODIFIED="1776522004871" TEXT="default ist dann LocalSlice_DefaultSetup&lt;SRV&gt;">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
direkt bei LocalSlice definiert; erzeugt eine default-konstruierte Instanz vom Service
</p>
</body>
</html>
</richcontent>
</node>
<node COLOR="#338800" CREATED="1776522006689" ID="ID_1991943573" MODIFIED="1776522019517" TEXT="getested: Spezialisierung ist m&#xf6;glich">
<icon BUILTIN="button_ok"/>
</node>
</node>
</node>
</node> </node>
<node COLOR="#338800" CREATED="1776474884669" ID="ID_66962199" MODIFIED="1776477543983" TEXT="LocalSlice_test"> <node COLOR="#338800" CREATED="1776474884669" ID="ID_66962199" MODIFIED="1776477543983" TEXT="LocalSlice_test">
<icon BUILTIN="button_ok"/> <icon BUILTIN="button_ok"/>