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DI: refurbish internal access for the configuration handles

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explicit friendship seems adequate here
DependInject<SRV> becomes more or less a hidden part of Depend<SRV>,
but I prefer to bundle all those quite technical details in a separate
header, and close to the usage
This commit is contained in:
Fischlurch 2018-03-19 01:14:52 +01:00
parent b776ce568f
commit f66d452c56
2 changed files with 210 additions and 164 deletions
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258
research/try.cpp
View file

@ -176,10 +176,151 @@ using std::move;
template<class SRV>
class DependInject
struct DependInject
{
using Factory = typename Depend<SRV>::Factory;
public:
/** configure dependency-injection for type SRV to build a subclass singleton
* @tparam SUB concrete subclass type to build on demand when invoking `Depend<SRV>`
* @throws error::Logic (LUMIERA_ERROR_LIFECYCLE) when the default factory has already
* been invoked at the point when calling this (re)configuration function.
*/
template<class SUB>
static void
useSingleton()
{
__assert_compatible<SUB>();
static InstanceHolder<SUB> singleton;
installFactory ([&]()
{
return singleton.buildInstance();
});
}
/**
* Configuration handle to expose a service implementation through the `Depend<SRV>` front-end.
* This noncopyable (but movable) handle shall be planted within the context operating the service
* to be exposed. It will immediately create (in RAII style) and manage a heap-allocated instance
* of the subclass `IMP` and expose a baseclass pointer to this specific instance through `Depend<SRV>`.
* Moreover, the implementation subclass can be accessed through this handle, which acts as smart-ptr.
* When the handle goes out of scope, the implementation instance is destroyed and the access through
* `Depend<SRV>` is closed and inhibited, to prevent on-demand creation of a baseclass `SRV` singleton.
* @tparam IMP concrete service implementation subclass to build, manage and expose.
* @throws error::Logic (LUMIERA_ERROR_LIFECYCLE) when the default factory has already
* been invoked at the point when calling this (re)configuration function.
*/
template<class IMP>
class ServiceInstance
{
std::unique_ptr<IMP> instance_;
public:
ServiceInstance()
: instance_(new IMP{})
{
__assert_compatible<IMP>();
activateServiceAccess (*instance_);
}
~ServiceInstance()
{
deactivateServiceAccess();
}
ServiceInstance (ServiceInstance&&) = default;
ServiceInstance (ServiceInstance const&) = delete;
ServiceInstance& operator= (ServiceInstance&&) = delete;
explicit
operator bool() const
{
return bool(instance_);
}
IMP&
operator* () const
{
ENSURE (instance_);
return *instance_;
}
IMP*
operator-> () const
{
ENSURE (instance_);
return instance_.get();
}
};
/**
* Configuration handle for temporarily shadowing a dependency by a test mock instance.
* This noncopyable (but movable) handle shall be planted within the immediate test context.
* It immediately stashes away the existing state and configuration from `Depend<SRV>`, but
* waits for actual invocation of the `Depend<SRV>`-front-end to create a heap-allocated
* instance of the `MOC` subclass, which it manages and exposes like a smart-ptr.
* When the handle goes out of scope, the original state and configuration is restored
*/
template<class MOC>
class Local
{
std::unique_ptr<MOC> mock_;
SRV* origInstance_;
Factory origFactory_;
public:
Local()
{
__assert_compatible<MOC>();
temporarilyInstallAlternateFactory (origInstance_, origFactory_
,[this]()
{
mock_.reset(new MOC{});
return mock_.get();
});
}
~Local()
{
restoreOriginalFactory (origInstance_, origFactory_);
}
Local (Local&&) = default;
Local (Local const&) = delete;
Local& operator= (Local&&) = delete;
explicit
operator bool() const
{
return bool(mock_);
}
MOC&
operator* () const
{
ENSURE (mock_);
return *mock_;
}
MOC*
operator-> () const
{
ENSURE (mock_);
return mock_.get();
}
};
protected: /* ======= internal access-API for those configurations to manipulate Depend<SRV> ======= */
template<class IMP>
friend class ServiceInstance;
template<class MOC>
friend class Local;
template<class SUB>
static void
__assert_compatible()
@ -234,115 +375,8 @@ class DependInject
{
ClassLock<SRV> guard;
Depend<SRV>::instance = nullptr;
Depend<SRV>::factory = Depend<SRV>::disabledFactory;
}
template<class SUB>
static void
useSingleton()
{
__assert_compatible<SUB>();
static InstanceHolder<SUB> singleton;
installFactory ([&]()
{
return singleton.buildInstance();
});
}
template<class IMP>
class ServiceInstance
{
std::unique_ptr<IMP> instance_;
public:
ServiceInstance()
: instance_(new IMP{})
{
__assert_compatible<IMP>();
activateServiceAccess (*instance_);
}
~ServiceInstance()
{
deactivateServiceAccess();
}
ServiceInstance (ServiceInstance&&) = default;
ServiceInstance (ServiceInstance const&) = delete;
ServiceInstance& operator= (ServiceInstance&&) = delete;
explicit
operator bool() const
{
return bool(instance_);
}
IMP&
operator* () const
{
ENSURE (instance_);
return *instance_;
}
IMP*
operator-> () const
{
ENSURE (instance_);
return instance_.get();
}
};
template<class MOC>
class Local
{
std::unique_ptr<MOC> mock_;
SRV* origInstance_;
Factory origFactory_;
public:
Local()
{
__assert_compatible<MOC>();
temporarilyInstallAlternateFactory (origInstance_, origFactory_
,[this]()
{
mock_.reset(new MOC{});
return mock_.get();
});
}
~Local()
{
restoreOriginalFactory (origInstance_, origFactory_);
}
Local (Local&&) = default;
Local (Local const&) = delete;
Local& operator= (Local&&) = delete;
explicit
operator bool() const
{
return bool(mock_);
}
MOC&
operator* () const
{
ENSURE (mock_);
return *mock_;
}
MOC*
operator-> () const
{
ENSURE (mock_);
return mock_.get();
}
};
};
@ -374,6 +408,7 @@ struct Dummy
using error::LUMIERA_ERROR_LIFECYCLE;
using error::LUMIERA_ERROR_FATAL;
int
main (int, char**)
@ -392,6 +427,9 @@ main (int, char**)
SHOW_EXPR( dep12().probe() );
SHOW_EXPR( checksum );
// unable to create singleton instance of abstract baseclass
VERIFY_ERROR (FATAL, Depend<Dum>{}() );
Depend<Dum> dumm;
DependInject<Dum>::useSingleton<Dummy<7>>();
SHOW_EXPR( dumm().probe() );

116
wiki/thinkPad.ichthyo.mm
View file

@ -26788,7 +26788,8 @@
<node CREATED="1521161634205" ID="ID_619508229" MODIFIED="1521330190739" TEXT="DependInject&lt;Bla&gt;::Local&lt;UnterBla&gt; mock"/>
<node CREATED="1521161919893" ID="ID_1606842354" MODIFIED="1521161929704" TEXT="mock-&gt;doItSpecial()"/>
</node>
<node CREATED="1521207954859" ID="ID_631339002" MODIFIED="1521207965947" TEXT="Analyse">
<node CREATED="1521207954859" ID="ID_631339002" MODIFIED="1521418307590" TEXT="Analyse">
<icon BUILTIN="idea"/>
<node CREATED="1521208242178" ID="ID_539882602" MODIFIED="1521208246821" TEXT="erforderliche Mechanismen">
<node CREATED="1521208254376" ID="ID_1933406851" MODIFIED="1521208256603" TEXT="Singleton">
<node CREATED="1521208339124" ID="ID_287433738" MODIFIED="1521209063045" TEXT="Closure &#xfc;ber konkreten Ctor"/>
@ -26990,7 +26991,8 @@
</node>
</node>
</node>
<node CREATED="1521169086441" ID="ID_284471203" MODIFIED="1521169088676" TEXT="Design">
<node COLOR="#338800" CREATED="1521169086441" ID="ID_284471203" MODIFIED="1521418328021" TEXT="Design">
<icon BUILTIN="button_ok"/>
<node CREATED="1521240056932" ID="ID_1189728630" MODIFIED="1521240061863" TEXT="Strukturen">
<node CREATED="1521240105285" ID="ID_711335043" MODIFIED="1521240109744" TEXT="Dependency-Factory">
<node CREATED="1521240317600" ID="ID_1626104494" MODIFIED="1521332944744" TEXT="Design-1">
@ -27009,7 +27011,8 @@
<node CREATED="1521241561380" ID="ID_437866764" MODIFIED="1521241569823" TEXT="oder als Funktionszeiger"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521245885376" ID="ID_1336783261" MODIFIED="1521245899152" TEXT="k&#xf6;nnte komplett wegfallen">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521245885376" ID="ID_1336783261" MODIFIED="1521416492280" TEXT="k&#xf6;nnte komplett wegfallen">
<linktarget COLOR="#b4a9c1" DESTINATION="ID_1336783261" ENDARROW="Default" ENDINCLINATION="224;0;" ID="Arrow_ID_37940927" SOURCE="ID_870619413" STARTARROW="None" STARTINCLINATION="83;-7;"/>
<icon BUILTIN="stop-sign"/>
</node>
</node>
@ -27024,19 +27027,24 @@
<node CREATED="1521242824239" ID="ID_1013563756" MODIFIED="1521242834313" TEXT="inline-wegwerf-Objekt"/>
</node>
</node>
<node CREATED="1521240053852" ID="ID_666003564" MODIFIED="1521240074107" TEXT="Detail-Fragen">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521169099047" ID="ID_1183392158" MODIFIED="1521332981466" TEXT="DependencyFactory-Rahmenklasse">
<icon BUILTIN="flag-yellow"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521169111957" ID="ID_1706232823" MODIFIED="1521169126860" TEXT="Ort f&#xfc;r den Implementierungs-Pointer">
<icon BUILTIN="flag-yellow"/>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521169130251" ID="ID_1252056818" MODIFIED="1521169146081" TEXT="Zugang f&#xfc;r DependInject">
<icon BUILTIN="flag-yellow"/>
</node>
<node COLOR="#338800" CREATED="1521324229082" ID="ID_1398878858" MODIFIED="1521326553373" TEXT="Storage">
<node CREATED="1521240053852" ID="ID_666003564" MODIFIED="1521418339291" STYLE="fork" TEXT="Detail-Fragen">
<icon BUILTIN="button_ok"/>
<node CREATED="1521324240124" ID="ID_1099103129" MODIFIED="1521333223154">
<node COLOR="#990000" CREATED="1521169099047" ID="ID_1183392158" MODIFIED="1521418281285" TEXT="DependencyFactory-Rahmenklasse">
<icon BUILTIN="button_cancel"/>
<node CREATED="1521416462342" ID="ID_1333178845" MODIFIED="1521418281285" TEXT="f&#xe4;llt weg"/>
<node CREATED="1521416471820" ID="ID_870619413" MODIFIED="1521418281285" TEXT="wir arbeiten direkt mit Lambdas">
<arrowlink COLOR="#b4a9c1" DESTINATION="ID_1336783261" ENDARROW="Default" ENDINCLINATION="224;0;" ID="Arrow_ID_37940927" STARTARROW="None" STARTINCLINATION="83;-7;"/>
</node>
</node>
<node COLOR="#338800" CREATED="1521169111957" ID="ID_1706232823" MODIFIED="1521418281285" TEXT="Ort f&#xfc;r den Implementierungs-Pointer">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521169130251" ID="ID_1252056818" MODIFIED="1521418281285" TEXT="Zugang f&#xfc;r DependInject">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521324229082" ID="ID_1398878858" MODIFIED="1521418281285" TEXT="Storage">
<icon BUILTIN="button_ok"/>
<node CREATED="1521324240124" ID="ID_1099103129" MODIFIED="1521418281285">
<richcontent TYPE="NODE"><html>
<head>
@ -27050,13 +27058,13 @@
</richcontent>
<icon BUILTIN="ksmiletris"/>
</node>
<node CREATED="1521324275919" ID="ID_1710451095" MODIFIED="1521333231077" TEXT="sehe aber auch keinen wirklichen Vorteil">
<node CREATED="1521324275919" ID="ID_1710451095" MODIFIED="1521418281285" TEXT="sehe aber auch keinen wirklichen Vorteil">
<icon BUILTIN="smiley-neutral"/>
<node CREATED="1521324529228" ID="ID_1786667023" MODIFIED="1521324543094" TEXT="man mu&#xdf; sich nicht um die de-Allokation k&#xfc;mmern"/>
<node CREATED="1521324554465" ID="ID_1577416641" MODIFIED="1521324568043" TEXT="Storage ist garantiert vorhanden, kein out-of-Memory"/>
<node CREATED="1521324668449" ID="ID_1013908061" MODIFIED="1521324682434" TEXT="Meyers Singleton ist elegant und schnell"/>
<node CREATED="1521324529228" ID="ID_1786667023" MODIFIED="1521418281285" TEXT="man mu&#xdf; sich nicht um die de-Allokation k&#xfc;mmern"/>
<node CREATED="1521324554465" ID="ID_1577416641" MODIFIED="1521418281285" TEXT="Storage ist garantiert vorhanden, kein out-of-Memory"/>
<node CREATED="1521324668449" ID="ID_1013908061" MODIFIED="1521418281285" TEXT="Meyers Singleton ist elegant und schnell"/>
</node>
<node CREATED="1521324321601" ID="ID_805959606" MODIFIED="1521324477609" TEXT="Nachteil: Storage ist stets belegt, auch wenn nicht notwendig">
<node CREATED="1521324321601" ID="ID_805959606" MODIFIED="1521418281285" TEXT="Nachteil: Storage ist stets belegt, auch wenn nicht notwendig">
<richcontent TYPE="NOTE"><html>
<head>
@ -27075,26 +27083,26 @@
</html>
</richcontent>
</node>
<node COLOR="#338800" CREATED="1521324883035" ID="ID_1438637057" MODIFIED="1521326539612" TEXT="Heap-Allokation k&#xf6;nnte insgesamt einfacher sein">
<node COLOR="#338800" CREATED="1521324883035" ID="ID_1438637057" MODIFIED="1521418281285" TEXT="Heap-Allokation k&#xf6;nnte insgesamt einfacher sein">
<icon BUILTIN="yes"/>
</node>
<node COLOR="#338800" CREATED="1521326541575" ID="ID_966508253" MODIFIED="1521326547454" TEXT="umgebaut auf Heap">
<node COLOR="#338800" CREATED="1521326541575" ID="ID_966508253" MODIFIED="1521418281285" TEXT="umgebaut auf Heap">
<icon BUILTIN="button_ok"/>
</node>
</node>
<node COLOR="#338800" CREATED="1521254014422" ID="ID_961824675" MODIFIED="1521324200616" TEXT="Meyers Singleton oder explizit ausprogrammieren?">
<node COLOR="#338800" CREATED="1521254014422" ID="ID_961824675" MODIFIED="1521418281285" TEXT="Meyers Singleton oder explizit ausprogrammieren?">
<icon BUILTIN="help"/>
<node CREATED="1521303577633" ID="ID_1665490706" MODIFIED="1521303615967" TEXT="das w&#xe4;re die &quot;Standard-L&#xf6;sung&quot; f&#xfc;r Singletons"/>
<node CREATED="1521303616675" ID="ID_135579041" MODIFIED="1521303721048" TEXT="hier aber nicht sinnvoll...">
<node CREATED="1521303634705" ID="ID_433169847" MODIFIED="1521303737486" TEXT="weil wir explizit ein Lock halten m&#xfc;ssen">
<node CREATED="1521303738410" ID="ID_213625497" MODIFIED="1521303748316" TEXT="um den Instanz-Pointer und die Factory zu managen"/>
<node CREATED="1521303749169" ID="ID_762346402" MODIFIED="1521303772913" TEXT="und der Compiler f&#xfc;r Meyers Singleton nochmal ein Lock generiert"/>
<node CREATED="1521303577633" ID="ID_1665490706" MODIFIED="1521418281285" TEXT="das w&#xe4;re die &quot;Standard-L&#xf6;sung&quot; f&#xfc;r Singletons"/>
<node CREATED="1521303616675" ID="ID_135579041" MODIFIED="1521418281285" TEXT="hier aber nicht sinnvoll...">
<node CREATED="1521303634705" ID="ID_433169847" MODIFIED="1521418281286" TEXT="weil wir explizit ein Lock halten m&#xfc;ssen">
<node CREATED="1521303738410" ID="ID_213625497" MODIFIED="1521418281286" TEXT="um den Instanz-Pointer und die Factory zu managen"/>
<node CREATED="1521303749169" ID="ID_762346402" MODIFIED="1521418281286" TEXT="und der Compiler f&#xfc;r Meyers Singleton nochmal ein Lock generiert"/>
</node>
<node CREATED="1521303775845" ID="ID_1256913997" MODIFIED="1521303814515" TEXT="weil wir unsere Singletons ggfs explizit zerst&#xf6;ren wollen"/>
<node CREATED="1521303816879" ID="ID_1463480909" MODIFIED="1521303842240" TEXT="weil wir eine Closure f&#xfc;r den Konstruktor erzeugen wollen"/>
<node CREATED="1521303847923" ID="ID_917362189" MODIFIED="1521303866596" TEXT="weil wir Abstrakte Typen explizit ausschlie&#xdf;en m&#xfc;ssen"/>
<node CREATED="1521303775845" ID="ID_1256913997" MODIFIED="1521418281286" TEXT="weil wir unsere Singletons ggfs explizit zerst&#xf6;ren wollen"/>
<node CREATED="1521303816879" ID="ID_1463480909" MODIFIED="1521418281286" TEXT="weil wir eine Closure f&#xfc;r den Konstruktor erzeugen wollen"/>
<node CREATED="1521303847923" ID="ID_917362189" MODIFIED="1521418281286" TEXT="weil wir Abstrakte Typen explizit ausschlie&#xdf;en m&#xfc;ssen"/>
</node>
<node CREATED="1521303869768" ID="ID_712811337" MODIFIED="1521303904421" TEXT="all das w&#xe4;re auch mit Meyers Singleton irgendwie hinzubekommen....">
<node CREATED="1521303869768" ID="ID_712811337" MODIFIED="1521418281286" TEXT="all das w&#xe4;re auch mit Meyers Singleton irgendwie hinzubekommen....">
<richcontent TYPE="NOTE"><html>
<head>
@ -27107,38 +27115,38 @@
</html>
</richcontent>
</node>
<node CREATED="1521303905491" ID="ID_1749674332" MODIFIED="1521303916944" TEXT="Fazit: explizit ist besser">
<node CREATED="1521303905491" ID="ID_1749674332" MODIFIED="1521418281286" TEXT="Fazit: explizit ist besser">
<icon BUILTIN="yes"/>
</node>
</node>
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<icon BUILTIN="flag-yellow"/>
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<icon BUILTIN="button_ok"/>
<node COLOR="#338800" CREATED="1521253803963" ID="ID_100415207" MODIFIED="1521418281286" TEXT="Installation wenn Factory bereits genutzt wurde">
<icon BUILTIN="button_ok"/>
</node>
<node COLOR="#338800" CREATED="1521253831776" ID="ID_1332033733" MODIFIED="1521387909137" TEXT="Zugriff auf Service bevor er hochgefahren wurde">
<node COLOR="#338800" CREATED="1521253831776" ID="ID_1332033733" MODIFIED="1521418281286" TEXT="Zugriff auf Service bevor er hochgefahren wurde">
<icon BUILTIN="button_ok"/>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1521253858692" ID="ID_442301762" MODIFIED="1521385565612" TEXT="t&#xfc;ckisch">
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1521253858692" ID="ID_442301762" MODIFIED="1521418281286" TEXT="t&#xfc;ckisch">
<icon BUILTIN="broken-line"/>
</node>
<node CREATED="1521253867787" ID="ID_662728746" MODIFIED="1521385616988" TEXT="Lifecycle-Handle existiert erst viel sp&#xe4;ter">
<node CREATED="1521253867787" ID="ID_662728746" MODIFIED="1521418281286" TEXT="Lifecycle-Handle existiert erst viel sp&#xe4;ter">
<icon BUILTIN="messagebox_warning"/>
</node>
<node CREATED="1521385652999" ID="ID_1974848336" MODIFIED="1521385657839" TEXT="statischer Schutz">
<node CREATED="1521385652999" ID="ID_1974848336" MODIFIED="1521418281286" TEXT="statischer Schutz">
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<node CREATED="1521385660206" ID="ID_200575604" MODIFIED="1521385685919" TEXT="fragil">
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<icon BUILTIN="stop-sign"/>
<node CREATED="1521385687874" ID="ID_1561975152" MODIFIED="1521386168998" TEXT="C++ kennt keine statische Klassen-Initialisierung">
<node CREATED="1521385687874" ID="ID_1561975152" MODIFIED="1521418281286" TEXT="C++ kennt keine statische Klassen-Initialisierung">
<icon BUILTIN="info"/>
</node>
<node CREATED="1521385709463" ID="ID_713439022" MODIFIED="1521385757820" TEXT="workaround">
<node CREATED="1521385721637" ID="ID_1822970415" MODIFIED="1521386025178" TEXT="Initialisieren eines statischen member">
<node CREATED="1521385709463" ID="ID_713439022" MODIFIED="1521418281286" TEXT="workaround">
<node CREATED="1521385721637" ID="ID_1822970415" MODIFIED="1521418281286" TEXT="Initialisieren eines statischen member">
<icon BUILTIN="idea"/>
</node>
<node CREATED="1521385768359" ID="ID_1123247553" MODIFIED="1521385776914" TEXT="ist unzuverl&#xe4;ssig">
<node CREATED="1521385782861" ID="ID_1190214158" MODIFIED="1521385787152" TEXT="erfordert non-const member"/>
<node CREATED="1521385787980" ID="ID_81600101" MODIFIED="1521385794375" TEXT="wird vom Compiler wegoptimiert"/>
<node CREATED="1521385795059" ID="ID_1426898485" MODIFIED="1521386008204" TEXT="sofern er Wirkungslosigkeit nachweisen kann...">
<node CREATED="1521385768359" ID="ID_1123247553" MODIFIED="1521418281286" TEXT="ist unzuverl&#xe4;ssig">
<node CREATED="1521385782861" ID="ID_1190214158" MODIFIED="1521418281286" TEXT="erfordert non-const member"/>
<node CREATED="1521385787980" ID="ID_81600101" MODIFIED="1521418281286" TEXT="wird vom Compiler wegoptimiert"/>
<node CREATED="1521385795059" ID="ID_1426898485" MODIFIED="1521418281286" TEXT="sofern er Wirkungslosigkeit nachweisen kann...">
<richcontent TYPE="NOTE"><html>
<head>
@ -27161,21 +27169,21 @@
</richcontent>
</node>
</node>
<node CREATED="1521386182598" ID="ID_1671815821" MODIFIED="1521386187993" TEXT="ist undurchsichtig">
<node CREATED="1521386182598" ID="ID_1671815821" MODIFIED="1521418281286" TEXT="ist undurchsichtig">
<icon BUILTIN="smily_bad"/>
</node>
</node>
</node>
<node CREATED="1521386206627" ID="ID_1928841192" MODIFIED="1521386214661" TEXT="erzeugt eh blo&#xdf; eine Fehlermeldung"/>
<node CREATED="1521386219297" ID="ID_1181038545" MODIFIED="1521386233755" TEXT="...was auch noch beim Hochfahren des Service passieren kann"/>
<node CREATED="1521386206627" ID="ID_1928841192" MODIFIED="1521418281286" TEXT="erzeugt eh blo&#xdf; eine Fehlermeldung"/>
<node CREATED="1521386219297" ID="ID_1181038545" MODIFIED="1521418281286" TEXT="...was auch noch beim Hochfahren des Service passieren kann"/>
</node>
<node CREATED="1521386241406" ID="ID_1481722887" MODIFIED="1521386259129" TEXT="es ist ein Architektur-Problem">
<node CREATED="1521386241406" ID="ID_1481722887" MODIFIED="1521418281286" TEXT="es ist ein Architektur-Problem">
<font ITALIC="true" NAME="SansSerif" SIZE="12"/>
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