Initial data commit

Task/Queue-Definition/Elena/queue-definition.elena

@@ -0,0 +1,63 @@
+import extensions;
+
+template queue<T>
+{
+    T[]  theArray;
+    int  theTop;
+    int  theTale;
+
+    constructor()
+    {
+        theArray := new T[](8);
+        theTop := 0;
+        theTale := 0;
+    }
+
+    bool empty()
+        = theTop == theTale;
+
+    push(T object)
+    {
+        if (theTale > theArray.Length)
+        {
+            theArray := theArray.reallocate(theTale)
+        };
+
+        theArray[theTale] := object;
+
+        theTale += 1
+    }
+
+    T pop()
+    {
+        if (theTale == theTop)
+            { InvalidOperationException.new:"Queue is empty".raise() };
+
+        T item := theArray[theTop];
+
+        theTop += 1;
+
+        ^ item
+    }
+}
+
+public program()
+{
+    queue<int> q := new queue<int>();
+    q.push(1);
+    q.push(2);
+    q.push(3);
+    console.printLine(q.pop());
+    console.printLine(q.pop());
+    console.printLine(q.pop());
+    console.printLine("a queue is ", q.empty().iif("empty","not empty"));
+    console.print("Trying to pop:");
+    try
+    {
+        q.pop()
+    }
+    catch(Exception e)
+    {
+        console.printLine(e.Message)
+    }
+}