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diff --git a/source/blender/functions/FN_multi_function_data_type.hh b/source/blender/functions/FN_multi_function_data_type.hh
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __FN_MULTI_FUNCTION_DATA_TYPE_HH__
+#define __FN_MULTI_FUNCTION_DATA_TYPE_HH__
+
+/** \file
+ * \ingroup fn
+ *
+ * A MFDataType describes what type of data a multi-function gets as input, outputs or mutates.
+ * Currently, only individual elements or vectors of elements are supported. Adding more data types
+ * is possible when necessary.
+ */
+
+#include "FN_cpp_type.hh"
+
+namespace blender {
+namespace fn {
+
+class MFDataType {
+ public:
+  enum Category {
+    Single,
+    Vector,
+  };
+
+ private:
+  Category m_category;
+  const CPPType *m_type;
+
+  MFDataType(Category category, const CPPType &type) : m_category(category), m_type(&type)
+  {
+  }
+
+ public:
+  MFDataType() = default;
+
+  static MFDataType ForSingle(const CPPType &type)
+  {
+    return MFDataType(Single, type);
+  }
+
+  static MFDataType ForVector(const CPPType &type)
+  {
+    return MFDataType(Vector, type);
+  }
+
+  template<typename T> static MFDataType ForSingle()
+  {
+    return MFDataType::ForSingle(CPPType::get<T>());
+  }
+
+  template<typename T> static MFDataType ForVector()
+  {
+    return MFDataType::ForVector(CPPType::get<T>());
+  }
+
+  bool is_single() const
+  {
+    return m_category == Single;
+  }
+
+  bool is_vector() const
+  {
+    return m_category == Vector;
+  }
+
+  Category category() const
+  {
+    return m_category;
+  }
+
+  const CPPType &single_type() const
+  {
+    BLI_assert(this->is_single());
+    return *m_type;
+  }
+
+  const CPPType &vector_base_type() const
+  {
+    BLI_assert(this->is_vector());
+    return *m_type;
+  }
+
+  friend bool operator==(const MFDataType &a, const MFDataType &b);
+  friend bool operator!=(const MFDataType &a, const MFDataType &b);
+
+  std::string to_string() const
+  {
+    switch (m_category) {
+      case Single:
+        return m_type->name();
+      case Vector:
+        return m_type->name() + " Vector";
+    }
+    BLI_assert(false);
+    return "";
+  }
+};
+
+inline bool operator==(const MFDataType &a, const MFDataType &b)
+{
+  return a.m_category == b.m_category && a.m_type == b.m_type;
+}
+
+inline bool operator!=(const MFDataType &a, const MFDataType &b)
+{
+  return !(a == b);
+}
+
+}  // namespace fn
+}  // namespace blender
+
+#endif /* __FN_MULTI_FUNCTION_DATA_TYPE_HH__ */