Added the Queue utility class

src/app/Queue.h

@@ -0,0 +1,118 @@
+#ifndef QUEUE_H
+#define QUEUE_H
+
+#include "definition.h"
+
+template <typename T>
+class Queue
+{
+public:
+    Queue(): _next(NULL), _head(this), _value(NULL)
+    {
+    }
+    ~Queue()
+    {
+        if(_head == this)
+            dispose();
+    }
+    boolean add(T value)
+    {
+        Queue *queueNode = new Queue(new T(value));
+        return addNewNodeAtTheEnd(queueNode);
+    }
+    boolean add(T *value)
+    {
+        Queue *queueNode = new Queue(value);
+        return addNewNodeAtTheEnd(queueNode);
+    }
+    unsigned int count()
+    {
+        unsigned int counter(0);
+        if(isQueueEmpty(_head->_next))return counter;
+
+        Queue *cursor = _head->_next;
+        while(!isQueueEmpty(cursor))
+        {
+            counter++;
+            cursor = cursor->_next;
+        }
+        return counter;
+    }
+    T* removeRef()
+    {
+        if(isQueueEmpty(_head->_next))return NULL;
+
+        T *refToReturn = _head->_next->_value;
+
+        _head->_next = _head->_next->_next;
+
+        return refToReturn;
+    }
+    T remove()
+    {
+        T *ref = removeRef();
+        if(ref != NULL)
+        {
+            T value(*ref);
+            delete ref;
+            return value;
+        }else
+        {
+            T value;
+            return value;
+        }
+    }
+    void clear(){_head->dispose();}
+    void dispose()
+    {
+        if(isQueueEmpty(_head->_next))return;
+
+        Queue *cursor = _head->_next, *toDelete(NULL);
+
+        while(!isQueueEmpty(cursor))
+        {
+            toDelete = cursor;
+            cursor = cursor->_next;
+
+            delete toDelete;
+        }
+        _head = this;
+        _next = NULL;
+    }
+protected:
+    Queue(T *value): Queue()
+    {
+        _value = value;
+    }
+    boolean isQueueEmpty(Queue *node){return node == NULL;}
+    boolean addNewNodeAtTheEnd(Queue *node)
+    {
+        if(node == NULL) return false;
+
+        node->_head = _head; //Every node should point to the first node
+
+        if(_next == NULL) //This is our first node then
+        {
+            _next = node;
+            return true;
+        }
+
+        // /!\ We have to work with the _next reference in the loop, if we don't it won't work as expected
+        Queue *cursor = _head;
+        while(!isQueueEmpty(cursor->_next))
+        {
+            cursor = cursor->_next;
+        }
+        cursor->_next = node;
+
+        return true;
+    }
+
+    Queue *_next;
+    Queue *_head;
+    T *_value;
+private:
+};
+
+
+#endif //QUEUE_H