ENH: added timeFunctionObject virtual class in inheritance hierarchy

- simply a functionObject with an additional Time reference, which is
  a combination frequently used by concrete functionObjects

src/functionObjects/utilities/timeActivatedFileUpdate/timeActivatedFileUpdate.C

@@ -89,8 +89,7 @@ Foam::functionObjects::timeActivatedFileUpdate::timeActivatedFileUpdate
     const dictionary& dict
 )
 :
-    functionObject(name),
-    time_(runTime),
+    timeFunctionObject(name, runTime),
     fileToUpdate_("unknown-fileToUpdate"),
     timeVsFile_(),
     lastIndex_(-1),
@@ -100,12 +99,6 @@ Foam::functionObjects::timeActivatedFileUpdate::timeActivatedFileUpdate
 }
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-Foam::functionObjects::timeActivatedFileUpdate::~timeActivatedFileUpdate()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 bool Foam::functionObjects::timeActivatedFileUpdate::read

src/functionObjects/utilities/timeActivatedFileUpdate/timeActivatedFileUpdate.H

@@ -69,7 +69,7 @@ SourceFiles
 #ifndef functionObjects_timeActivatedFileUpdate_H
 #define functionObjects_timeActivatedFileUpdate_H
 
-#include "functionObject.H"
+#include "timeFunctionObject.H"
 #include "Tuple2.H"
 #include "Switch.H"
 
@@ -85,17 +85,14 @@ namespace functionObjects
 {
 
 /*---------------------------------------------------------------------------*\
-                  Class timeActivatedFileUpdate Declaration
+          Class functionObjects::timeActivatedFileUpdate Declaration
 \*---------------------------------------------------------------------------*/
 
 class timeActivatedFileUpdate
 :
-    public functionObject
+    public functionObjects::timeFunctionObject
 {
-    // Private data
-
-        //- Reference to Time
-        const Time& time_;
+    // Private Member Data
 
         //- Name of file to update
         fileName fileToUpdate_;
@@ -140,7 +137,7 @@ public:
 
 
     //- Destructor
-    virtual ~timeActivatedFileUpdate();
+    virtual ~timeActivatedFileUpdate() = default;
 
 
     // Member Functions