Functions: Generic array data structure

Sometimes it's useful to pass around a set of values with a generic
type. The virtual array data structures allow this, but they don't
have logical ownership. My initial use case for this is as a return
type for the functions that interpolate curve attributes to evaluated
points, but a need for this data structure has come up in a few other
places as well. It also reduced the need for templates.

Differential Revision: https://developer.blender.org/D11103

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/functions/FN_generic_virtual_array.hh b/source/blender/functions/FN_generic_virtual_array.hh
index 703118ba23e..8aad017e68b 100644
--- a/source/blender/functions/FN_generic_virtual_array.hh
+++ b/source/blender/functions/FN_generic_virtual_array.hh
@@ -27,6 +27,7 @@
 
 #include "BLI_virtual_array.hh"
 
+#include "FN_generic_array.hh"
 #include "FN_generic_span.hh"
 
 namespace blender::fn {
@@ -398,6 +399,16 @@ template<typename T> class GVArray_For_VArray : public GVArray {
   }
 };
 
+class GVArray_For_GArray : public GVArray_For_GSpan {
+ protected:
+  GArray<> array_;
+
+ public:
+  GVArray_For_GArray(GArray<> array) : GVArray_For_GSpan(array.as_span()), array_(std::move(array))
+  {
+  }
+};
+
 /* Used to convert any generic virtual array into a typed one. */
 template<typename T> class VArray_For_GVArray : public VArray<T> {
  protected: