Tasmota/lib/lib_basic/LinkedList-1.2.3/LinkedList.h

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/*
LinkedList.h - V1.1 - Generic LinkedList implementation
Works better with FIFO, because LIFO will need to
search the entire List to find the last one;
For instructions, go to https://github.com/ivanseidel/LinkedList
Created by Ivan Seidel Gomes, March, 2013.
Released into the public domain.
*/
#ifndef LinkedList_h
#define LinkedList_h
#include <stddef.h>
template<class T>
struct ListNode
{
T data;
ListNode<T> *next;
};
template <typename T>
class LinkedList{
protected:
int _size;
ListNode<T> *root;
ListNode<T> *last;
// Helps "get" method, by saving last position
ListNode<T> *lastNodeGot;
int lastIndexGot;
// isCached should be set to FALSE
// everytime the list suffer changes
bool isCached;
ListNode<T>* getNode(int index);
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ListNode<T>* findEndOfSortedString(ListNode<T> *p, int (*cmp)(T &, T &));
public:
LinkedList();
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LinkedList(int sizeIndex, T _t); //initiate list size and default value
~LinkedList();
/*
Returns current size of LinkedList
*/
virtual int size();
/*
Adds a T object in the specified index;
Unlink and link the LinkedList correcly;
Increment _size
*/
virtual bool add(int index, T);
/*
Adds a T object in the end of the LinkedList;
Increment _size;
*/
virtual bool add(T);
/*
Adds a T object in the start of the LinkedList;
Increment _size;
*/
virtual bool unshift(T);
/*
Set the object at index, with T;
*/
virtual bool set(int index, T);
/*
Remove object at index;
If index is not reachable, returns false;
else, decrement _size
*/
virtual T remove(int index);
/*
Remove last object;
*/
virtual T pop();
/*
Remove first object;
*/
virtual T shift();
/*
Get the index'th element on the list;
Return Element if accessible,
else, return false;
*/
virtual T get(int index);
/*
Clear the entire array
*/
virtual void clear();
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/*
Sort the list, given a comparison function
*/
virtual void sort(int (*cmp)(T &, T &));
// add support to array brakets [] operator
inline T& operator[](int index);
inline T& operator[](size_t& i) { return this->get(i); }
inline const T& operator[](const size_t& i) const { return this->get(i); }
};
// Initialize LinkedList with false values
template<typename T>
LinkedList<T>::LinkedList()
{
root=NULL;
last=NULL;
_size=0;
lastNodeGot = root;
lastIndexGot = 0;
isCached = false;
}
// Clear Nodes and free Memory
template<typename T>
LinkedList<T>::~LinkedList()
{
ListNode<T>* tmp;
while(root!=NULL)
{
tmp=root;
root=root->next;
delete tmp;
}
last = NULL;
_size=0;
isCached = false;
}
/*
Actualy "logic" coding
*/
template<typename T>
ListNode<T>* LinkedList<T>::getNode(int index){
int _pos = 0;
ListNode<T>* current = root;
// Check if the node trying to get is
// immediatly AFTER the previous got one
if(isCached && lastIndexGot <= index){
_pos = lastIndexGot;
current = lastNodeGot;
}
while(_pos < index && current){
current = current->next;
_pos++;
}
// Check if the object index got is the same as the required
if(_pos == index){
isCached = true;
lastIndexGot = index;
lastNodeGot = current;
return current;
}
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return NULL;
}
template<typename T>
int LinkedList<T>::size(){
return _size;
}
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template<typename T>
LinkedList<T>::LinkedList(int sizeIndex, T _t){
for (int i = 0; i < sizeIndex; i++){
add(_t);
}
}
template<typename T>
bool LinkedList<T>::add(int index, T _t){
if(index >= _size)
return add(_t);
if(index == 0)
return unshift(_t);
ListNode<T> *tmp = new ListNode<T>(),
*_prev = getNode(index-1);
tmp->data = _t;
tmp->next = _prev->next;
_prev->next = tmp;
_size++;
isCached = false;
return true;
}
template<typename T>
bool LinkedList<T>::add(T _t){
ListNode<T> *tmp = new ListNode<T>();
tmp->data = _t;
tmp->next = NULL;
if(root){
// Already have elements inserted
last->next = tmp;
last = tmp;
}else{
// First element being inserted
root = tmp;
last = tmp;
}
_size++;
isCached = false;
return true;
}
template<typename T>
bool LinkedList<T>::unshift(T _t){
if(_size == 0)
return add(_t);
ListNode<T> *tmp = new ListNode<T>();
tmp->next = root;
tmp->data = _t;
root = tmp;
_size++;
isCached = false;
return true;
}
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template<typename T>
T& LinkedList<T>::operator[](int index) {
return getNode(index)->data;
}
template<typename T>
bool LinkedList<T>::set(int index, T _t){
// Check if index position is in bounds
if(index < 0 || index >= _size)
return false;
getNode(index)->data = _t;
return true;
}
template<typename T>
T LinkedList<T>::pop(){
if(_size <= 0)
return T();
isCached = false;
if(_size >= 2){
ListNode<T> *tmp = getNode(_size - 2);
T ret = tmp->next->data;
delete(tmp->next);
tmp->next = NULL;
last = tmp;
_size--;
return ret;
}else{
// Only one element left on the list
T ret = root->data;
delete(root);
root = NULL;
last = NULL;
_size = 0;
return ret;
}
}
template<typename T>
T LinkedList<T>::shift(){
if(_size <= 0)
return T();
if(_size > 1){
ListNode<T> *_next = root->next;
T ret = root->data;
delete(root);
root = _next;
_size --;
isCached = false;
return ret;
}else{
// Only one left, then pop()
return pop();
}
}
template<typename T>
T LinkedList<T>::remove(int index){
if (index < 0 || index >= _size)
{
return T();
}
if(index == 0)
return shift();
if (index == _size-1)
{
return pop();
}
ListNode<T> *tmp = getNode(index - 1);
ListNode<T> *toDelete = tmp->next;
T ret = toDelete->data;
tmp->next = tmp->next->next;
delete(toDelete);
_size--;
isCached = false;
return ret;
}
template<typename T>
T LinkedList<T>::get(int index){
ListNode<T> *tmp = getNode(index);
return (tmp ? tmp->data : T());
}
template<typename T>
void LinkedList<T>::clear(){
while(size() > 0)
shift();
}
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template<typename T>
void LinkedList<T>::sort(int (*cmp)(T &, T &)){
if(_size < 2) return; // trivial case;
for(;;) {
ListNode<T> **joinPoint = &root;
while(*joinPoint) {
ListNode<T> *a = *joinPoint;
ListNode<T> *a_end = findEndOfSortedString(a, cmp);
if(!a_end->next ) {
if(joinPoint == &root) {
last = a_end;
isCached = false;
return;
}
else {
break;
}
}
ListNode<T> *b = a_end->next;
ListNode<T> *b_end = findEndOfSortedString(b, cmp);
ListNode<T> *tail = b_end->next;
a_end->next = NULL;
b_end->next = NULL;
while(a && b) {
if(cmp(a->data, b->data) <= 0) {
*joinPoint = a;
joinPoint = &a->next;
a = a->next;
}
else {
*joinPoint = b;
joinPoint = &b->next;
b = b->next;
}
}
if(a) {
*joinPoint = a;
while(a->next) a = a->next;
a->next = tail;
joinPoint = &a->next;
}
else {
*joinPoint = b;
while(b->next) b = b->next;
b->next = tail;
joinPoint = &b->next;
}
}
}
}
template<typename T>
ListNode<T>* LinkedList<T>::findEndOfSortedString(ListNode<T> *p, int (*cmp)(T &, T &)) {
while(p->next && cmp(p->data, p->next->data) <= 0) {
p = p->next;
}
return p;
}
#endif