1 files changed, 82 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_type_conversions.hh b/source/blender/blenkernel/BKE_type_conversions.hh
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+++ b/source/blender/blenkernel/BKE_type_conversions.hh
@@ -0,0 +1,82 @@
+/*
+ * 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
+
+#include "FN_multi_function.hh"
+
+namespace blender::bke {
+
+using fn::CPPType;
+
+struct ConversionFunctions {
+  const fn::MultiFunction *multi_function;
+  void (*convert_single_to_initialized)(const void *src, void *dst);
+  void (*convert_single_to_uninitialized)(const void *src, void *dst);
+};
+
+class DataTypeConversions {
+ private:
+  Map<std::pair<fn::MFDataType, fn::MFDataType>, ConversionFunctions> conversions_;
+
+ public:
+  void add(fn::MFDataType from_type,
+           fn::MFDataType to_type,
+           const fn::MultiFunction &fn,
+           void (*convert_single_to_initialized)(const void *src, void *dst),
+           void (*convert_single_to_uninitialized)(const void *src, void *dst))
+  {
+    conversions_.add_new({from_type, to_type},
+                         {&fn, convert_single_to_initialized, convert_single_to_uninitialized});
+  }
+
+  const ConversionFunctions *get_conversion_functions(fn::MFDataType from, fn::MFDataType to) const
+  {
+    return conversions_.lookup_ptr({from, to});
+  }
+
+  const ConversionFunctions *get_conversion_functions(const CPPType &from, const CPPType &to) const
+  {
+    return this->get_conversion_functions(fn::MFDataType::ForSingle(from),
+                                          fn::MFDataType::ForSingle(to));
+  }
+
+  const fn::MultiFunction *get_conversion_multi_function(fn::MFDataType from,
+                                                         fn::MFDataType to) const
+  {
+    const ConversionFunctions *functions = this->get_conversion_functions(from, to);
+    return functions ? functions->multi_function : nullptr;
+  }
+
+  bool is_convertible(const CPPType &from_type, const CPPType &to_type) const
+  {
+    return conversions_.contains(
+        {fn::MFDataType::ForSingle(from_type), fn::MFDataType::ForSingle(to_type)});
+  }
+
+  void convert_to_uninitialized(const CPPType &from_type,
+                                const CPPType &to_type,
+                                const void *from_value,
+                                void *to_value) const;
+
+  fn::GVArray try_convert(fn::GVArray varray, const CPPType &to_type) const;
+
+  fn::GVMutableArray try_convert(fn::GVMutableArray varray, const CPPType &to_type) const;
+};
+
+const DataTypeConversions &get_implicit_type_conversions();
+
+}  // namespace blender::bke