From 8d78727d6e7badca16ba7a1328643928a0039569 Mon Sep 17 00:00:00 2001
From: Loek Le Blansch <loek@pipeframe.xyz>
Date: Mon, 18 Nov 2024 18:02:09 +0100
Subject: move utilities from loek/audio

---
 src/crepe/util/OptionalRef.h | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/crepe/util/OptionalRef.h

(limited to 'src/crepe/util/OptionalRef.h')

diff --git a/src/crepe/util/OptionalRef.h b/src/crepe/util/OptionalRef.h
new file mode 100644
index 0000000..1ad3a6d
--- /dev/null
+++ b/src/crepe/util/OptionalRef.h
@@ -0,0 +1,41 @@
+#pragma once
+
+namespace crepe {
+
+/**
+ * \brief Optional reference utility
+ *
+ * This class doesn't need to know the full definition of \c T to be used.
+ *
+ * \tparam T Value type
+ */
+template <typename T>
+class OptionalRef {
+public:
+	OptionalRef() = default;
+	OptionalRef(T &);
+  OptionalRef<T> & operator=(T &);
+	explicit operator bool() const noexcept;
+
+	void set(T &) noexcept;
+	T & get() const;
+	void clear() noexcept;
+
+  OptionalRef(const OptionalRef<T> &);
+  OptionalRef(OptionalRef<T> &&);
+  OptionalRef<T> & operator=(const OptionalRef<T> &);
+  OptionalRef<T> & operator=(OptionalRef<T> &&);
+
+private:
+	/**
+	 * \brief Reference to the value of type \c T
+	 *
+	 * \note This raw pointer is *not* managed, and only used as a reference!
+	 */
+	T * ref = nullptr;
+};
+
+}
+
+#include "OptionalRef.hpp"
+
-- 
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