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-rw-r--r--1_anno/Programmazione_2/data_structures/list_double.cc182
1 files changed, 182 insertions, 0 deletions
diff --git a/1_anno/Programmazione_2/data_structures/list_double.cc b/1_anno/Programmazione_2/data_structures/list_double.cc
new file mode 100644
index 0000000..fa0af26
--- /dev/null
+++ b/1_anno/Programmazione_2/data_structures/list_double.cc
@@ -0,0 +1,182 @@
+#include<iostream>
+
+using namespace std;
+
+template<typename T>
+struct node {
+ T value;
+ node* prev;
+ node* next;
+};
+
+
+template<typename T>
+class list {
+public:
+ list() : _head{nullptr} {}
+
+ ~list() {
+ while(_head != nullptr) {
+ node<T>* tmp = _head->next;
+ delete tmp;
+ _head = tmp;
+ }
+ }
+
+ list* push_front(T val) {
+ if(!_head) {
+ _head = new node<T>{val, nullptr, nullptr};
+ } else {
+ _head = new node<T>{val, nullptr, _head};
+ _head->next->prev = _head;
+ }
+
+ return this;
+ }
+
+ list* push_back(T val) {
+ if(!_head) return this->push_front(val);
+
+ node<T>* iter = _head;
+ while(iter->next) {
+ iter = iter->next;
+ }
+ iter->next = new node<T>{val, iter, nullptr};
+
+ return this;
+ }
+
+ list* push_after_value(T val, T newval) {
+ node<T>* elem = _search(val);
+ if(elem) {
+ node<T>* nod = new node<T>{newval, elem, elem->next};
+ elem->next = nod;
+ nod->next->prev = nod;
+ }
+
+ return this;
+ }
+
+ list* push_before_value(T val, T newval) {
+ node<T>* elem = _search(val);
+ if(!elem) return this;
+
+ node<T>* iter = _head;
+
+ if(iter->value == val)
+ return this->push_front(newval);
+
+ while(iter->next != elem)
+ iter = iter->next;
+
+ node<T>* nod = new node<T>{newval, iter, iter->next};
+ iter->next = nod;
+ nod->next->prev = nod;
+
+ return this;
+ }
+
+ list* pop(int val) {
+ node<T>* elem = _search(val);
+ if(!elem) return this;
+
+ if(elem == _head) return this->pop_front();
+
+ node<T>* iter = elem->prev;
+ node<T>* temp = iter->next;
+ iter->next = iter->next->next;
+ iter->next->prev = iter;
+ delete temp;
+
+ return this;
+ }
+
+ list* pop_front() {
+ if(!_head)
+ return this;
+
+ node<T>* elem = _head;
+ _head = _head->next;
+ _head->prev = nullptr;
+ delete elem;
+
+ return this;
+ }
+
+ list* pop_back() {
+ if(!_head)
+ return this;
+
+ node<T>* iter = _last()->prev;
+
+ if(iter->next == nullptr) {
+ delete iter;
+ _head = nullptr;
+ } else if(iter->next->next) {
+ delete iter->next->next;
+ } else {
+ delete iter->next;
+ }
+
+ iter->next = nullptr;
+
+ return this;
+ }
+
+ void print() {
+ node<T>* iter = _head;
+ while(iter) {
+ cout << iter->value << ' ';
+ cout << "[[ " << (iter->prev!=nullptr ? iter->prev->value : -1) << ", ";
+ cout << (iter->next!=nullptr ? iter->next->value : -1) << " ]], ";
+ iter = iter->next;
+ }
+ }
+private:
+ node<T>* _last() {
+ node<T>* iter = _head;
+ while(iter->next) {
+ iter = iter->next;
+ }
+
+ return iter;
+ }
+
+ node<T>* _search(T value) {
+ node<T>* iter = _head;
+ while(iter && iter->value != value)
+ iter = iter->next;
+
+ return iter;
+ }
+
+ node<T>* _head;
+};
+
+int main() {
+ list<int>* l = new list<int>{};
+ l->push_front(2)->push_front(1);
+ l->print(); cout << endl;
+ l->push_back(5);
+ l->print(); cout << endl;
+ l->push_back(10)->push_back(15);
+ l->print(); cout << endl;
+ l->push_after_value(5, 6);
+ l->print(); cout << endl;
+ l->push_after_value(5, 7);
+ l->print(); cout << endl;
+ l->push_before_value(5, 4);
+ l->print(); cout << endl;
+ l->push_before_value(5, 3);
+ l->print(); cout << endl;
+ l->pop_back();
+ l->print(); cout << endl;
+ l->pop_front();
+ l->print(); cout << endl;
+ l->pop(2);
+ l->print(); cout << endl;
+
+ delete l;
+
+ return 0;
+}