make ListIterator continue working on a changing list

1 files changed, 4 insertions, 4 deletions

diff --git a/backend/List.hpp b/backend/List.hpp
index 25e7a56..634f14b 100644
--- a/backend/List.hpp
+++ b/backend/List.hpp
@@ -8,7 +8,7 @@ size_t List<T>::size() const {
 }
 
 template <typename T>
-void List<T>::push_back(T & el) {
+void List<T>::push_back(const T & el) {
 	ListLink<T> * link = new ListLink<T> {
 		.prev = this->head,
 		.next = nullptr,
@@ -78,17 +78,17 @@ T & List<T>::operator [] (size_t index) const {
 }
 
 template <typename T>
-ListRange<T> List<T>::range() const {
+ListRange<T> List<T>::range() {
 	return { *this };
 }
 
 template <typename T>
-ListIterator<T> List<T>::begin() const {
+ListIterator<T> List<T>::begin() {
 	return this->range().begin();
 }
 
 template <typename T>
-ListIterator<T> List<T>::end() const {
+ListIterator<T> List<T>::end() {
 	return this->range().end();
 }