Replace executor class with a template --- we've got closures, after all :)

src/emucore/tia/core_6502ts/DelayQueue.cxx

@@ -51,17 +51,4 @@ namespace TIA6502tsCore {
     myIndices[address] = index;
   }
 
-  void DelayQueue::execute(Executor& executor) {
-    DelayQueueMember& currentMember = myMembers.at(myIndex);
-
-    for (auto&& entry : currentMember) {
-      executor(entry.address, entry.value);
-      myIndices[entry.address] = 0xFF;
-    }
-
-    currentMember.clear();
-
-    myIndex = (myIndex + 1) & myMembers.size();
-  }
-
 } // namespace TIA6502tsCore

src/emucore/tia/core_6502ts/DelayQueue.hxx

@@ -27,18 +27,6 @@ namespace TIA6502tsCore {
 
 class DelayQueue {
 
-  public:
-
-    class Executor {
-
-      public:
-
-        virtual void operator()(uInt8 address, uInt8 value) = 0;
-
-        virtual ~Executor() = default;
-
-    };
-
   public:
 
     DelayQueue(uInt8 length, uInt8 size);
@@ -47,7 +35,7 @@ class DelayQueue {
 
     void push(uInt8 address, uInt8 value, uInt8 delay);
 
-    void execute(Executor& executor);
+    template<class T> void execute(T executor);
 
   private:
 
@@ -67,6 +55,23 @@ class DelayQueue {
 
 };
 
+// ############################################################################
+// Implementation
+// ############################################################################
+
+template<class T> void DelayQueue::execute(T executor) {
+  DelayQueueMember& currentMember = myMembers.at(myIndex);
+
+  for (auto&& entry : currentMember) {
+    executor(entry.address, entry.value);
+    myIndices[entry.address] = 0xFF;
+  }
+
+  currentMember.clear();
+
+  myIndex = (myIndex + 1) & myMembers.size();
+}
+
 } // namespace TIA6502tsCore
 
 #endif //  TIA_6502TS_CORE_DELAY_QUEUE

src/emucore/tia/core_6502ts/TIA.cxx

@@ -28,27 +28,7 @@ namespace TIA6502tsCore {
       mySound(sound),
       mySettings(settings),
       myDelayQueue(10, 20)
-  {
+  {}
-    class DelayedWriteExecutor : public DelayQueue::Executor {
-
-      public:
-
-        DelayedWriteExecutor(TIA& tia) : myTia(tia)
-        {}
-
-        void operator()(uInt8 address, uInt8 value) override
-        {
-          myTia.delayedWrite(address, value);
-        }
-
-      private:
-
-        TIA& myTia;
-
-    };
-
-    myDelayQueueExecutor.reset(new DelayedWriteExecutor(*this));
-  }
 
   // TODO: stub
   void TIA::reset()

src/emucore/tia/core_6502ts/TIA.hxx

@@ -128,7 +128,6 @@ class TIA : public AbstractTIA {
     Settings& mySettings;
 
     DelayQueue myDelayQueue;
-    unique_ptr<DelayQueue::Executor> myDelayQueueExecutor;
 
    private: