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+/**
+ * @file mutableref.h
+ * @author L.-C. C.
+ * @brief
+ * @version 0.1
+ * @date 2020-01-03
+ *
+ * @copyright Copyright (c) 2020
+ *
+ */
+
+#pragma once
+
+#include <utility>
+
+namespace safe
+{
+ namespace impl
+ {
+ /**
+ * @brief A helper class that defines a member variable of type
+ * Type. The variable is defined "mutable Type" if Type is not a
+ * reference, the variable is "Type&" if Type is a reference.
+ *
+ * @tparam Type The type of the variable to define.
+ */
+ template<typename Type>
+ struct MutableIfNotReference
+ {
+ /// Mutable Type object.
+ mutable Type get;
+ };
+ template<typename Type>
+ struct MutableIfNotReference<Type&>
+ {
+ /// Reference to a Type object.
+ Type& get;
+ };
+ } // namespace impl
+} // namespace safe