diff --git a/libopenage/curve/CMakeLists.txt b/libopenage/curve/CMakeLists.txt
index 1aa1efb55b..623a22a25a 100644
--- a/libopenage/curve/CMakeLists.txt
+++ b/libopenage/curve/CMakeLists.txt
@@ -3,6 +3,7 @@ add_sources(libopenage
 	continuous.cpp
 	discrete.cpp
 	discrete_mod.cpp
+    element_wrapper.cpp
 	interpolated.cpp
 	iterator.cpp
 	keyframe.cpp
diff --git a/libopenage/curve/element_wrapper.cpp b/libopenage/curve/element_wrapper.cpp
new file mode 100644
index 0000000000..5d2eaa08af
--- /dev/null
+++ b/libopenage/curve/element_wrapper.cpp
@@ -0,0 +1,9 @@
+// Copyright 2024-2024 the openage authors. See copying.md for legal info.
+
+#include "element_wrapper.h"
+
+namespace openage::curve {
+
+// This file is intended to be empty
+
+} // namespace openage::curve
diff --git a/libopenage/curve/element_wrapper.h b/libopenage/curve/element_wrapper.h
new file mode 100644
index 0000000000..764b61d5cd
--- /dev/null
+++ b/libopenage/curve/element_wrapper.h
@@ -0,0 +1,95 @@
+// Copyright 2024-2024 the openage authors. See copying.md for legal info.
+
+#pragma once
+
+#include "time/time.h"
+
+namespace openage::curve {
+
+/**
+ * Wrapper for elements in a curve container.
+ *
+ * Stores the lifetime of the element (insertion time and erasure time) alongside the value.
+ */
+template <typename T>
+class element_wrapper {
+public:
+	/**
+	 * Create a new element with insertion time \p time and a given value.
+	 *
+	 * Erasure time is set to time::TIME_MAX, i.e. the element is alive indefinitely.
+	 *
+	 * @param time Insertion time of the element.
+	 * @param value Element value.
+	 */
+	element_wrapper(const time::time_t &time, const T &value) :
+		_alive{time},
+		_dead{time::TIME_MAX},
+		_value{value} {}
+
+	/**
+	 * Create a new element with insertion time \p alive and erasure time \p dead and a given value.
+	 *
+	 * @param alive Insertion time of the element.
+	 * @param dead Erasure time of the element.
+	 * @param value Element value.
+	 */
+	element_wrapper(const time::time_t &alive, const time::time_t &dead, const T &value) :
+		_alive{alive},
+		_dead{dead},
+		_value{value} {}
+
+	/**
+	 * Get the insertion time of this element.
+	 *
+	 * @return Time when the element was inserted into the container.
+	 */
+	const time::time_t &alive() const {
+		return _alive;
+	}
+
+	/**
+	 * Get the erasure time of this element.
+	 *
+	 * @return Time when the element was erased from the container.
+	 */
+	const time::time_t &dead() const {
+		return _dead;
+	}
+
+	/**
+	 * Set the erasure time of this element.
+	 *
+	 * @param time Time when the element was erased from the container.
+	 */
+	void set_dead(const time::time_t &time) {
+		_dead = time;
+	}
+
+	/**
+	 * Get the value of this element.
+	 *
+	 * @return Value of the element.
+	 */
+	const T &value() const {
+		return _value;
+	}
+
+private:
+	/**
+	 * Time of insertion of the element into the container
+	 */
+	time::time_t _alive;
+
+	/**
+	 * Time of erasure of the element from the container
+	 */
+	time::time_t _dead;
+
+	/**
+	 * Element value
+	 */
+	T _value;
+};
+
+} // namespace openage::curve
diff --git a/libopenage/curve/map.h b/libopenage/curve/map.h
index 9712c89470..5a5e0a4d9b 100644
--- a/libopenage/curve/map.h
+++ b/libopenage/curve/map.h
@@ -1,4 +1,4 @@
-// Copyright 2017-2023 the openage authors. See copying.md for legal info.
+// Copyright 2017-2024 the openage authors. See copying.md for legal info.
 
 #pragma once
 
@@ -8,6 +8,7 @@
 #include <utility>
 
 #include "curve/map_filter_iterator.h"
+#include "curve/element_wrapper.h"
 #include "time/time.h"
 #include "util/fixed_point.h"
 
@@ -20,26 +21,15 @@ namespace openage::curve {
  */
 template <typename key_t, typename val_t>
 class UnorderedMap {
-	/** Internal container to access all data and metadata */
-	struct map_element {
-		map_element(const val_t &v, const time::time_t &a, const time::time_t &d) :
-			value(v),
-			alive(a),
-			dead(d) {}
-
-		val_t value;
-		time::time_t alive;
-		time::time_t dead;
-	};
 
 	/**
 	 * Data holder. Maps keys to map elements.
 	 * Map elements themselves store when they are valid.
 	 */
-	std::unordered_map<key_t, map_element> container;
+	std::unordered_map<key_t, element_wrapper<val_t>> container;
 
 public:
-	using const_iterator = typename std::unordered_map<key_t, map_element>::const_iterator;
+	using const_iterator = typename std::unordered_map<key_t, element_wrapper<val_t>>::const_iterator;
 
 	std::optional<MapFilterIterator<key_t, val_t, UnorderedMap>>
 	operator()(const time::time_t &, const key_t &) const;
@@ -95,7 +85,7 @@ std::optional<MapFilterIterator<key_t, val_t, UnorderedMap<key_t, val_t>>>
 UnorderedMap<key_t, val_t>::at(const time::time_t &time,
                                const key_t &key) const {
 	auto e = this->container.find(key);
-	if (e != this->container.end() and e->second.alive <= time and e->second.dead > time) {
+	if (e != this->container.end() and e->second.alive() <= time and e->second.dead() > time) {
 		return MapFilterIterator<key_t, val_t, UnorderedMap<key_t, val_t>>(
 			e,
 			this,
@@ -160,7 +150,7 @@ UnorderedMap<key_t, val_t>::insert(const time::time_t &alive,
                                    const time::time_t &dead,
                                    const key_t &key,
                                    const val_t &value) {
-	map_element e(value, alive, dead);
+	element_wrapper<val_t> e{alive, dead, value};
 	auto it = this->container.insert(std::make_pair(key, e));
 	return MapFilterIterator<key_t, val_t, UnorderedMap<key_t, val_t>>(
 		it.first,
diff --git a/libopenage/curve/map_filter_iterator.h b/libopenage/curve/map_filter_iterator.h
index 5e71c0789f..3aec2a899e 100644
--- a/libopenage/curve/map_filter_iterator.h
+++ b/libopenage/curve/map_filter_iterator.h
@@ -1,4 +1,4 @@
-// Copyright 2017-2023 the openage authors. See copying.md for legal info.
+// Copyright 2017-2024 the openage authors. See copying.md for legal info.
 
 #pragma once
 
@@ -35,8 +35,8 @@ class MapFilterIterator : public CurveIterator<val_t, container_t> {
 	using CurveIterator<val_t, container_t>::operator=;
 
 	virtual bool valid() const override {
-		return (this->get_base()->second.alive >= this->from
-		        and this->get_base()->second.dead < this->to);
+		return (this->get_base()->second.alive() >= this->from
+		        and this->get_base()->second.dead() < this->to);
 	}
 
 	/**
@@ -44,7 +44,7 @@ class MapFilterIterator : public CurveIterator<val_t, container_t> {
 	 * Nicer way of accessing it beside operator *.
 	 */
 	val_t const &value() const override {
-		return this->get_base()->second.value;
+		return this->get_base()->second.value();
 	}
 
 	/**
diff --git a/libopenage/curve/queue.h b/libopenage/curve/queue.h
index 9604a76308..9314dd3a0e 100644
--- a/libopenage/curve/queue.h
+++ b/libopenage/curve/queue.h
@@ -13,6 +13,7 @@
 
 #include "curve/iterator.h"
 #include "curve/queue_filter_iterator.h"
+#include "curve/element_wrapper.h"
 #include "event/evententity.h"
 #include "time/time.h"
 #include "util/fixed_point.h"
@@ -32,39 +33,11 @@ namespace curve {
  */
 template <class T>
 class Queue : public event::EventEntity {
-	struct queue_wrapper {
-		// Insertion time of the element
-		time::time_t _alive;
-		// Erase time of the element
-		// TODO: this has to be mutable because erase() will complain otherwise
-		mutable time::time_t _dead;
-		// Element value
-		T value;
-
-		queue_wrapper(const time::time_t &time, const T &value) :
-			_alive{time},
-			_dead{time::TIME_MAX},
-			value{value} {}
-
-		const time::time_t &alive() const {
-			return _alive;
-		}
-
-		const time::time_t &dead() const {
-			return _dead;
-		}
-
-		// TODO: this has to be const because erase() will complain otherwise
-		void set_dead(const time::time_t &time) const {
-			_dead = time;
-		}
-	};
-
 public:
 	/**
 	 * The underlaying container type.
 	 */
-	using container_t = typename std::vector<queue_wrapper>;
+	using container_t = typename std::vector<element_wrapper<T>>;
 
 	/**
 	 * The index type to access elements in the container
@@ -304,7 +277,7 @@ const T &Queue<T>::front(const time::time_t &time) const {
 	                                   << ", container size: " << this->container.size()
 	                                   << ")");
 
-	return this->container.at(at).value;
+	return this->container.at(at).value();
 }
 
 
@@ -330,7 +303,7 @@ const T &Queue<T>::pop_front(const time::time_t &time) {
 
 	this->changes(time);
 
-	return this->container.at(at).value;
+	return this->container.at(at).value();
 }
 
 
@@ -412,7 +385,7 @@ QueueFilterIterator<T, Queue<T>> Queue<T>::insert(const time::time_t &time,
 
 	// Get the iterator to the insertion point
 	iterator insertion_point = std::next(this->container.begin(), at);
-	insertion_point = this->container.insert(insertion_point, queue_wrapper{time, e});
+	insertion_point = this->container.insert(insertion_point, element_wrapper<T>{time, e});
 
 	// TODO: Inserting before any dead elements shoud reset their death time
 	//       since by definition, they cannot be popped before the new element
diff --git a/libopenage/curve/queue_filter_iterator.h b/libopenage/curve/queue_filter_iterator.h
index 248abb44ad..cf6bc5aa2c 100644
--- a/libopenage/curve/queue_filter_iterator.h
+++ b/libopenage/curve/queue_filter_iterator.h
@@ -40,7 +40,7 @@ class QueueFilterIterator : public CurveIterator<val_t, container_t, typename co
 
 	const val_t &value() const override {
 		const auto &a = *this->get_base();
-		return a.value;
+		return a.value();
 	}
 };