adding cs235

cs235/lab05/irdeque.cpp

@@ -0,0 +1,52 @@
+#include "irdeque.h"
+
+bool irdeque::addToIRDequeLeft(int id) {
+    if(in_irdeque(id)) {
+        return false;
+    }
+    l.insertHead(id);
+    return true;
+}
+
+bool irdeque::removeFromIRDequeLeft() {
+    int id = l.at(l.size() - 1);
+    l.remove(id);
+    return true;
+}
+
+bool irdeque::removeFromIRDequeRight() {
+    int id = l.at(0);
+    l.remove(id);
+    return false;
+}
+
+int irdeque::showTopOfIRDequeLeft() {
+    if(l.size() == 0) {
+        return -1;
+    }
+    int left = l.at(l.size() - 1);
+    return left;
+}
+
+int irdeque::showTopOfIRDequeRight() {
+    if(l.size() == 0) {
+        return -1;
+    }
+    int right = l.at(0);
+    return right;
+}
+
+int irdeque::showSizeOfIRDeque() {
+    return l.size();
+}
+
+bool irdeque::in_irdeque(int id) {
+    node* node_ptr = l.head;
+    while(node_ptr != NULL) {
+        if(node_ptr->id == id) {
+            return true;
+        }
+        node_ptr = node_ptr->next;
+    }
+    return false;
+}