Geometry Nodes: improve geometry nodes evaluator internal api

This is a first step towards T87620.
It should not have any functional changes.

Goals of this refactor:
* Move the evaluator out of `MOD_nodes.cc`. That makes it easier to
  improve it in isolation.
* Extract core input/out parameter management out of `GeoNodeExecParams`.
  Managing this is the responsibility of the evaluator. This separation of
  concerns will be useful once we have lazy evaluation of certain inputs/outputs.

Differential Revision: https://developer.blender.org/D11085

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/functions/FN_generic_pointer.hh b/source/blender/functions/FN_generic_pointer.hh
index 2bd66daa7fe..f88ff09f916 100644
--- a/source/blender/functions/FN_generic_pointer.hh
+++ b/source/blender/functions/FN_generic_pointer.hh
@@ -66,6 +66,16 @@ class GMutablePointer {
     return type_ != nullptr && type_->is<T>();
   }
 
+  template<typename T> T relocate_out()
+  {
+    BLI_assert(this->is_type<T>());
+    T value;
+    type_->relocate_to_initialized(data_, &value);
+    data_ = nullptr;
+    type_ = nullptr;
+    return value;
+  }
+
   void destruct()
   {
     BLI_assert(data_ != nullptr);