diff --git a/research/try.cpp b/research/try.cpp
index f8190b934..afe11ee2f 100644
--- a/research/try.cpp
+++ b/research/try.cpp
@@ -48,12 +48,14 @@ typedef unsigned int uint;
 #include "lib/format-cout.hpp"
 #include "lib/depend.hpp"
 #include "lib/depend2.hpp"
+#include "lib/meta/util.hpp"
 //#include "lib/meta/util.hpp"
 #include "lib/test/test-helper.hpp"
 #include "lib/util.hpp"
 
 #include <boost/noncopyable.hpp>
 #include <functional>
+#include <type_traits>
 
 
 #define SHOW_TYPE(_TY_) \
@@ -62,9 +64,64 @@ typedef unsigned int uint;
     cout << "Probe " << STRINGIFY(_XX_) << " ? = " << _XX_ <<endl;
 
 
-using lib::ClassLock;
 namespace error = lumiera::error;
 
+using lib::ClassLock;
+using lib::meta::enable_if;
+
+
+
+  template<typename TAR, typename SEL =void>
+  class InstanceHolder
+    : boost::noncopyable
+    {
+      /** storage for the service instance */
+      char buff_[sizeof(TAR)];
+      bool alive_ = false;
+      
+      
+    public:
+     ~InstanceHolder()
+        {
+          if (alive_)
+            try {
+                alive_ = false;
+                reinterpret_cast<TAR&> (buff_). ~TAR();
+              }
+            catch(...)
+              { // no logging since we might be in static shutdown
+                lumiera_error(); // reset errorflag
+              }
+        }
+      
+      
+      TAR*
+      buildInstance()
+        {
+          if (alive_)
+            throw error::Fatal("Attempt to double-create a singleton service. "
+                               "Either the application logic, or the compiler "
+                               "or runtime system is seriously broken"
+                              ,error::LUMIERA_ERROR_LIFECYCLE);
+          
+          // place new instance into embedded buffer
+          TAR* newInstance = new(&buff_) TAR ();
+          alive_ = true;
+          return newInstance;
+        }
+    };
+  
+  template<typename ABS>
+  class InstanceHolder<ABS,  enable_if<std::is_abstract<ABS>>>
+    {
+    public:
+      ABS*
+      buildInstance()
+        {
+          throw error::Fatal("Attempt to create a singleton instance of an abstract class. "
+                             "Application architecture or lifecycle is seriously broken.");
+        }
+    };
 
 
 
@@ -74,14 +131,16 @@ class DependInject;
 template<class SRV>
 class Depend
   {
+  public:
     using Factory = std::function<SRV*()>;
     
     static SRV* instance;
     static Factory factory;
     
+    static InstanceHolder<SRV> singleton;
+    
     friend class DependInject<SRV>;
     
-  public:
     SRV&
     operator() ()
       {
@@ -101,8 +160,7 @@ class Depend
           {
             if (!factory)
               {
-                static SRV singleton{};
-                instance = &singleton;
+                instance = singleton.buildInstance();
                 factory = disabledFactory;
               }
             else
@@ -125,17 +183,29 @@ SRV* Depend<SRV>::instance;
 template<class SRV>
 typename Depend<SRV>::Factory Depend<SRV>::factory;
 
+template<class SRV>
+InstanceHolder<SRV> Depend<SRV>::singleton;
 
+
+
+struct Dum
+  : boost::noncopyable
+  {
+    virtual ~Dum() { }
+    virtual int probe()  =0;
+  };
+
+  
 int checksum = 0;
 
 template<int N>
 struct Dummy
-  : boost::noncopyable
+  : Dum
   {
     Dummy() { checksum += N; }
    ~Dummy() { checksum -= N; }
     
-    int
+    virtual int
     probe()
       {
         return N * checksum;
@@ -161,6 +231,10 @@ main (int, char**)
     SHOW_EXPR( dep12().probe() );
     SHOW_EXPR( checksum );
     
+    Depend<Dum> dumm;
+    Depend<Dum>::factory = [](){ return nullptr; };
+    SHOW_EXPR( dumm().probe() );
+    
     
     cout <<  "\n.gulp.\n";
     
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 7ae326b65..8f1b18fdf 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -26995,13 +26995,39 @@
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521254014422" ID="ID_961824675" MODIFIED="1521254035254" 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>
+<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>
+<node CREATED="1521303869768" ID="ID_712811337" MODIFIED="1521303904421" TEXT="all das w&#xe4;re auch mit Meyers Singleton irgendwie hinzubekommen....">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      ...aber dann eben nicht mehr <i>elegant.</i>
+    </p>
+  </body>
+</html>
+</richcontent>
+</node>
+<node CREATED="1521303905491" ID="ID_1749674332" MODIFIED="1521303916944" TEXT="Fazit: explizit ist besser">
+<icon BUILTIN="yes"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521253797733" ID="ID_1640990866" MODIFIED="1521253802565" TEXT="Fehlerbehandlung">
 <icon BUILTIN="flag-yellow"/>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521253803963" ID="ID_100415207" MODIFIED="1521253827633" TEXT="Installation wenn Factory bereits genutzt wurde">
 <icon BUILTIN="flag-yellow"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521253831776" ID="ID_1332033733" MODIFIED="1521253852814" TEXT="Zugriff auf Service bevor her hochgefahren wurde">
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1521253831776" ID="ID_1332033733" MODIFIED="1521303545433" TEXT="Zugriff auf Service bevor er hochgefahren wurde">
 <icon BUILTIN="flag-yellow"/>
 <node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1521253858692" ID="ID_442301762" MODIFIED="1521253866011" TEXT="t&#xfc;ckisch">
 <icon BUILTIN="flag-pink"/>