baseline of test-dummy implementation or a mutation target binding

- we're using the source / target buffer paradigm to implement the mutation
 - we're using Record<string> to account for "the current content"

src/lib/diff/test-mutation-target.hpp

@@ -51,9 +51,10 @@
 #include "lib/diff/tree-mutator.hpp"
 #include "lib/idi/genfunc.hpp"
 #include "lib/test/event-log.hpp"
-//#include "lib/util.hpp"
+#include "lib/util.hpp"
 //#include "lib/format-string.hpp"
 
+#include <boost/noncopyable.hpp>
 //#include <functional>
 #include <string>
 //#include <vector>
@@ -72,7 +73,16 @@ namespace diff{
 //  using std::function;
   using std::string;
   
+  using RecS = lib::diff::Record<string>;
+  
   namespace {
+    template<typename T>
+    string
+    identify (const T* const entity)
+      {
+        return lib::idi::instanceTypeID(entity);
+      }
+
   }
   
   
@@ -82,24 +92,40 @@ namespace diff{
    * @todo WIP 2/2016
    */
   class TestMutationTarget
+    : boost::noncopyable
     {
       
-      EventLog log_{this->identify()};
+      EventLog log_{identify (this)};
+      
+      RecS::Mutator content_{};
+      RecS     prev_content_{};
       
     public:
       
+      /* === Operation / Mutation API === */
+      
+      void
+      initMutation (string mutatorID)
+        {
+          content_.swap (prev_content_);
+          log_.event ("attachMutator "+mutatorID);
+        }
+      
+      
       /* === Diagnostic / Verification === */
       
       bool
       empty()  const
         {
-          UNIMPLEMENTED ("NIL check");
+          return content_.empty();
         }
       
+      /** check for recorded element */
       bool
       contains (string spec)  const
         {
-          UNIMPLEMENTED ("check for recorded element");
+          RecS const& currentValidContent{content_};
+          return util::contains (currentValidContent, spec);
         }
       
       EventMatch
@@ -146,11 +172,6 @@ namespace diff{
       
       
     private:
-      string
-      identify() const
-        {
-          return lib::idi::instanceTypeID(this);
-        }
     };
   
   
@@ -163,10 +184,21 @@ namespace diff{
       {
         TestMutationTarget& target_;
         
+        /* ==== re-Implementation of the operation API ==== */
+        
+        virtual void
+        injectNew (GenNode const& n)  override
+          {
+            UNIMPLEMENTED("establish new child node at current position");
+          }
+        
+        
         TestWireTap(TestMutationTarget& dummy, PAR const& chain)
           : PAR(chain)
           , target_(dummy)
-          { }
+          {
+            target_.initMutation (identify(this));
+          }
       };
     
     template<class PAR>

src/lib/diff/tree-mutator.hpp

@@ -105,8 +105,8 @@ namespace diff{
   
   
   /**
-   * Customisable intermediary to abstract
-   * mutating operations on arbitrary, hierarchical object-like data.
+   * Customisable intermediary to abstract mutating operations
+   * on arbitrary, hierarchical object-like data.
    * The TreeMutator exposes two distinct interfaces
    * - the \em operation API -- similar to what a container exposes --
    *   is the entirety of abstract operations that can be done to the
@@ -155,6 +155,7 @@ namespace diff{
       static Builder<TreeMutator> build();
     };
   
+  
   namespace { // Mutator-Builder decorator components...
     
     /**

tests/library/diff/tree-manipulation-binding-test.cpp

@@ -103,6 +103,7 @@ namespace test{
         }
       
       
+      /** @test diagnostic binding: how to monitor and verify the mutations applied */
       void
       mutateDummy()
         {
@@ -131,7 +132,7 @@ namespace test{
       void
       mutateCollection()
         {
-          TODO ("define how to map the mutation primitives on a generic collection");
+          TODO ("define how to map the mutation primitives onto a generic collection");
         }
       
       

wiki/thinkPad.ichthyo.mm

@@ -1504,7 +1504,7 @@
 <node CREATED="1456430115696" ID="ID_546849410" MODIFIED="1456430120227" TEXT="es ist notwendig"/>
 <node CREATED="1456430109105" ID="ID_366046751" MODIFIED="1456430172153" TEXT="es ist machbar"/>
 </node>
-<node CREATED="1456430178935" ID="ID_1069025314" MODIFIED="1456430181467" TEXT="der Weg...">
+<node CREATED="1456430178935" HGAP="22" ID="ID_1069025314" MODIFIED="1457038595966" TEXT="der Weg..." VSHIFT="5">
 <node CREATED="1456430183863" ID="ID_464613085" MODIFIED="1456430193433" TEXT="expliziter Stack"/>
 <node CREATED="1456430194117" ID="ID_943734591" MODIFIED="1456430211847" TEXT="enth&#xe4;lt Front-End"/>
 <node CREATED="1456430212811" ID="ID_90339221" MODIFIED="1456430233644" TEXT="und Backend in Puffer"/>
@@ -1656,9 +1656,10 @@
 </node>
 </node>
 </node>
+<node CREATED="1457038737878" HGAP="44" ID="ID_643190842" MODIFIED="1457038749290" TEXT="Abstraktions-Grad"/>
 </node>
 <node CREATED="1456506821808" ID="ID_1852134358" MODIFIED="1456506824771" TEXT="Typ-Konstrukt"/>
-<node CREATED="1456523437616" ID="ID_410606899" MODIFIED="1456523446531" TEXT="Manipulations-Interface">
+<node CREATED="1456523437616" HGAP="27" ID="ID_410606899" MODIFIED="1457038546189" TEXT="Manipulations-Interface" VSHIFT="6">
 <node BACKGROUND_COLOR="#fdfdcf" COLOR="#990000" CREATED="1456523455997" ID="ID_1416114013" MODIFIED="1456523464201" TEXT="Deadlock!">
 <icon BUILTIN="messagebox_warning"/>
 <node CREATED="1456523507910" ID="ID_429333479" MODIFIED="1456523518005" TEXT="Henne oder Ei?"/>