Geometry Nodes: avoid allocation when construct varray for single value

Previously, `GVArray::ForSingle` would always allocate a copy of the passed
in value. Now it only does so when the value is too large or not trivial.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/functions/FN_cpp_type.hh b/source/blender/functions/FN_cpp_type.hh
index 643b2fc1f28..7ddb5bf1f46 100644
--- a/source/blender/functions/FN_cpp_type.hh
+++ b/source/blender/functions/FN_cpp_type.hh
@@ -207,6 +207,18 @@ class CPPType : NonCopyable, NonMovable {
     return is_trivially_destructible_;
   }
 
+  /**
+   * When true, the value is like a normal C type, it can be copied around with #memcpy and does
+   * not have to be destructed.
+   *
+   * C++ equivalent:
+   *   std::is_trivial_v<T>;
+   */
+  bool is_trivial() const
+  {
+    return is_trivial_;
+  }
+
   bool is_default_constructible() const
   {
     return default_construct_ != nullptr;