add conversion methods to NekArray

Field.hpp

@@ -13,6 +13,7 @@
 #include "MemoryRegionCPU.hpp"
 #include <LibUtilities/BasicUtils/ErrorUtil.hpp>
 #include <LibUtilities/BasicUtils/ShapeType.hpp>
+#include <LibUtilities/BasicUtils/SharedArray.hpp>
 
 /**
  * @brief Captures the structure of a block of elements of identical shape
@@ -120,6 +121,20 @@ public:
         return field;
     }
 
+    template <template <typename> class TMemoryRegion = MemoryRegionCPU>
+    static Field<TType, TState> fromArray(
+        std::vector<BlockAttributes> blocks,
+        Nektar::Array<Nektar::OneD, TType> const &array)
+    {
+        auto field = create<MemoryRegionCPU>(blocks);
+
+        std::copy(array.begin(), array.end(), field.GetStorage().GetCPUPtr());
+
+        field.template GetStorage<TMemoryRegion>(); // convert storage to
+                                                    // TMemoryRegion
+        return field;
+    }
+
     /**
      * @brief Get the underlying storage of the field as the requested type.
      * @return MemoryRegion storage converted to the requested type
@@ -244,6 +259,12 @@ public:
         return component_names.size();
     }
 
+    Nektar::Array<Nektar::OneD, TType> toArray() const
+    {
+        return Nektar::Array<Nektar::OneD, TType>(m_storage->size(),
+                                                  m_storage->GetCPUPtr());
+    }
+
 private:
     /**
      * @brief Reshapes the current storage interleaving to a non-interleaved