Geometry Nodes: add utility to convert CPPType to static type

source/blender/blenkernel/BKE_attribute_math.hh

@@ -21,8 +21,12 @@
 
 #include "DNA_customdata_types.h"
 
+#include "FN_cpp_type.hh"
+
 namespace blender::attribute_math {
 
+using fn::CPPType;
+
 /**
  * Utility function that simplifies calling a templated function based on a custom data type.
  */
@@ -54,6 +58,31 @@ void convert_to_static_type(const CustomDataType data_type, const Func &func)
   }
 }
 
+template<typename Func> void convert_to_static_type(const fn::CPPType &cpp_type, const Func &func)
+{
+  if (cpp_type.is<float>()) {
+    func(float());
+  }
+  else if (cpp_type.is<float2>()) {
+    func(float2());
+  }
+  else if (cpp_type.is<float3>()) {
+    func(float3());
+  }
+  else if (cpp_type.is<int>()) {
+    func(int());
+  }
+  else if (cpp_type.is<bool>()) {
+    func(bool());
+  }
+  else if (cpp_type.is<Color4f>()) {
+    func(Color4f());
+  }
+  else {
+    BLI_assert_unreachable();
+  }
+}
+
 /* -------------------------------------------------------------------- */
 /** \name Mix three values of the same type.
  *