1 files changed, 72 insertions, 0 deletions
diff --git a/source/blender/functions/FN_field_cpp_type.hh b/source/blender/functions/FN_field_cpp_type.hh
new file mode 100644
index 00000000000..5e6f1b5a585
--- /dev/null
+++ b/source/blender/functions/FN_field_cpp_type.hh
@@ -0,0 +1,72 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+/** \file
+ * \ingroup fn
+ */
+
+#include "FN_cpp_type_make.hh"
+#include "FN_field.hh"
+
+namespace blender::fn {
+
+template<typename T> struct FieldCPPTypeParam {
+};
+
+class FieldCPPType : public CPPType {
+ private:
+  const CPPType &field_type_;
+
+ public:
+  template<typename T>
+  FieldCPPType(FieldCPPTypeParam<Field<T>> /* unused */, StringRef debug_name)
+      : CPPType(CPPTypeParam<Field<T>, CPPTypeFlags::None>(), debug_name),
+        field_type_(CPPType::get<T>())
+  {
+  }
+
+  const CPPType &field_type() const
+  {
+    return field_type_;
+  }
+
+  /* Ensure that #GField and #Field<T> have the same layout, to enable casting between the two. */
+  static_assert(sizeof(Field<int>) == sizeof(GField));
+  static_assert(sizeof(Field<int>) == sizeof(Field<std::string>));
+
+  const GField &get_gfield(const void *field) const
+  {
+    return *(const GField *)field;
+  }
+
+  void construct_from_gfield(void *r_value, const GField &gfield) const
+  {
+    new (r_value) GField(gfield);
+  }
+};
+
+}  // namespace blender::fn
+
+#define MAKE_FIELD_CPP_TYPE(DEBUG_NAME, FIELD_TYPE) \
+  template<> \
+  const blender::fn::CPPType &blender::fn::CPPType::get_impl<blender::fn::Field<FIELD_TYPE>>() \
+  { \
+    static blender::fn::FieldCPPType cpp_type{ \
+        blender::fn::FieldCPPTypeParam<blender::fn::Field<FIELD_TYPE>>(), STRINGIFY(DEBUG_NAME)}; \
+    return cpp_type; \
+  }