Function: add method to create shallow copy of virtual array

Creating a shallow copy is sometimes useful to get a unique ptr
for a virtual array when one only has a reference. It shouldn't
be used usually, but sometimes its the fastest way to do correct
ownership handling.

1 files changed, 8 insertions, 3 deletions

diff --git a/source/blender/functions/FN_generic_virtual_array.hh b/source/blender/functions/FN_generic_virtual_array.hh
index 848deb6bc04..fba69f30330 100644
--- a/source/blender/functions/FN_generic_virtual_array.hh
+++ b/source/blender/functions/FN_generic_virtual_array.hh
@@ -34,6 +34,12 @@ namespace blender::fn {
 template<typename T> class GVArray_Typed;
 template<typename T> class GVMutableArray_Typed;
 
+class GVArray;
+class GVMutableArray;
+
+using GVArrayPtr = std::unique_ptr<GVArray>;
+using GVMutableArrayPtr = std::unique_ptr<GVMutableArray>;
+
 /* A generically typed version of `VArray<T>`. */
 class GVArray {
  protected:
@@ -143,6 +149,8 @@ class GVArray {
     return GVArray_Typed<T>(*this);
   }
 
+  GVArrayPtr shallow_copy() const;
+
  protected:
   virtual void get_impl(const int64_t index, void *r_value) const;
   virtual void get_to_uninitialized_impl(const int64_t index, void *r_value) const = 0;
@@ -215,9 +223,6 @@ class GVMutableArray : public GVArray {
   virtual void *try_get_internal_mutable_varray_impl();
 };
 
-using GVArrayPtr = std::unique_ptr<GVArray>;
-using GVMutableArrayPtr = std::unique_ptr<GVMutableArray>;
-
 class GVArray_For_GSpan : public GVArray {
  protected:
   const void *data_ = nullptr;