MSVC C2280 on TArray<TUniquePtr<IVoxelDensityOp>>'s copy path. Putting
VOXELFORGE_API on the class forces the compiler to instantiate every implicit
member, including copy-assignment -- which cannot exist for a move-only element
type. The export moves to AppendStructuralPost, the only out-of-line method.
Also declares the move-only-ness explicitly rather than leaving it implied. That
is the right semantics independently of the compiler: a stack uniquely OWNS its
operators, and copying one would mean cloning polymorphic ops, which is
meaningless here.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fr0zka
62e3d5a933