PODAllocator: loosen the requirements on T to non-polymorphic

This does not break the allocation mechanism, but allows to use the PODAllocator
with derived classes, which still do not rely on virtual functions.

algo/CMakeLists.txt

@@ -369,10 +369,7 @@ install(
     base/RecoParams.h
     base/SubChain.h
     base/System.h
-    base/PartitionedVector.h
-    base/PartitionedSpan.h
     base/DigiData.h
-    base/PODVector.h
     base/AlgoTraits.h
     base/AuxDigiData.h
     base/BuildInfo.h

core/containers/PODAllocator.h

@@ -22,7 +22,7 @@ namespace cbm
     // static_assert(std::is_trivially_constructible_v<T>, "PODAllocator only works for POD types");
 
     // Ensure T has no vtable
-    static_assert(std::is_standard_layout_v<T>, "PODAllocator only works with types with standard layout");
+    static_assert(!std::is_polymorphic_v<T>, "PODAllocator only works with types with non-polymorphic types");
 
     using value_type = T;