From da3d7a913c0b10b4aa776b97def10a3727e07bd5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Nusser?= <anusser@mpi-inf.mpg.de>
Date: Sun, 11 Apr 2021 20:23:04 +0200
Subject: Add clear member function to EventsDS.

---
 src/events_ds.cc  | 19 +++++++++++++++++++
 src/events_ds.h   |  3 +++
 src/memory_heap.h |  8 ++++++++
 3 files changed, 30 insertions(+)

diff --git a/src/events_ds.cc b/src/events_ds.cc
index ee21f93..0195a89 100644
--- a/src/events_ds.cc
+++ b/src/events_ds.cc
@@ -99,6 +99,25 @@ void EventsDS::startAddingNewGroup(InstrumentID instrument_id)
 	}
 }
 
+void EventsDS::clear()
+{
+	// *this = EventsDS();
+
+	id_to_info.clear();
+	id_to_group_data.clear();
+	for (auto& channel_data: channel_data_array)
+	{
+		channel_data.sample_events.clear();
+	}
+	for (auto& event_group_ids:  instruments_sample_event_group_ids)
+	{
+		event_group_ids.clear();
+	}
+
+	current_group_id.invalidate();
+	current_groups_instrument_id.invalidate();
+}
+
 void EventsDS::removeGroup(EventGroupID group_id, InstrumentID instrument_id)
 {
 	// if we remove the current group, then invalidate it
diff --git a/src/events_ds.h b/src/events_ds.h
index 5855711..fdab881 100644
--- a/src/events_ds.h
+++ b/src/events_ds.h
@@ -96,6 +96,9 @@ public:
 	//! when startAddingNewGroup is again called.
 	void startAddingNewGroup(InstrumentID instrument_id = InstrumentID());
 
+	//! Clears the whole data structure to make it ready for a new drum kit.
+	void clear();
+
 private:
 	struct ChannelData
 	{
diff --git a/src/memory_heap.h b/src/memory_heap.h
index 3f0105a..658598c 100644
--- a/src/memory_heap.h
+++ b/src/memory_heap.h
@@ -61,6 +61,7 @@ public:
 	T& get(Index index);
 	const T& get(Index index) const;
 	void remove(Index index);
+	void clear();
 
 private:
 	std::vector<T> memory;
@@ -119,3 +120,10 @@ void MemoryHeap<T>::remove(Index index)
 {
 	free_indices.push_back(index);
 }
+
+template <typename T>
+void MemoryHeap<T>::clear()
+{
+	memory.clear();
+	free_indices.clear();
+}
-- 
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