From f279107065146a4940f5e73602a1c3c09e58b31d Mon Sep 17 00:00:00 2001
From: Santo Cariotti <dcariotti24@gmail.com>
Date: Sun, 18 Oct 2020 18:56:43 +0200
Subject: chore: name of first year folder

---
 1_anno/Programmazione_2/data_structures/queue.cc | 72 ++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 1_anno/Programmazione_2/data_structures/queue.cc

(limited to '1_anno/Programmazione_2/data_structures/queue.cc')

diff --git a/1_anno/Programmazione_2/data_structures/queue.cc b/1_anno/Programmazione_2/data_structures/queue.cc
new file mode 100644
index 0000000..8398459
--- /dev/null
+++ b/1_anno/Programmazione_2/data_structures/queue.cc
@@ -0,0 +1,72 @@
+#include<iostream>
+
+using namespace std;
+
+template<typename T>
+struct node {
+    T value;
+    node<T>* next;
+};
+
+template<class T>
+class queue {
+public:
+    queue() : _head{nullptr} {}
+
+    ~queue() {
+        auto iter = _head;
+        while(iter) {
+            delete iter;
+            iter = iter->next;
+        }
+    }
+
+    queue<T>* enqueue(T val) {
+
+        if(!_head) {
+            _head = new node<T>{val, nullptr};
+            _tail = _head;
+        } else {
+            _tail->next = new node<T>{val, nullptr};
+            _tail = _tail->next;
+        }
+
+        return this;
+    }
+
+    node<T>* dequeue() {
+        if(!_head) return nullptr;
+        auto iter = _head;
+        delete _head;
+        _head = iter->next;
+        return iter;
+    }
+
+    void print() {
+        auto iter = _head;
+        while(iter) {
+            cout << iter->value << ' ';
+            iter = iter->next;
+        }
+        cout << endl;
+    }
+private:
+    node<T>* _head;
+    node<T>* _tail;
+};
+
+int main() {
+    queue<int>* q = new queue<int>();
+
+    q->dequeue();
+    q->enqueue(4)->enqueue(2)->enqueue(8);
+    q->print();
+    auto e = q->dequeue();
+    if(e)
+        cout << e->value << endl;
+    q->enqueue(1);
+    q->print();
+
+    delete q;
+    return 0;
+}
-- 
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