If input field was on device than copy it again after loading (#11)

When the field was already on device on a call to load_iteration is was not copied again.

Author: havogt

src/core/serialization.h

@@ -84,6 +84,9 @@ class serialization : private boost::noncopyable {
         type_erased_field_view< T > field,
         const ser::Savepoint &savepoint,
         bool alsoPrevious = false) {
+
+        bool field_was_on_device = !field.is_on_host();
+
         // Make sure data is on the Host
         field.update_host();
 
@@ -122,6 +125,9 @@ class serialization : private boost::noncopyable {
 
         serializer_->ReadField(
             name, savepoint, static_cast< void * >(field.data()), iStride, jStride, kStride, 0, alsoPrevious);
+
+        if (field_was_on_device)
+            field.update_device();
     }
 
     /** @} */

src/core/type_erased_field.h

@@ -205,6 +205,8 @@ namespace internal {
          * Update host pointer (calls d2h_update)
          */
         virtual void update_host() noexcept = 0;
+
+        virtual bool is_on_host() const noexcept = 0;
     };
 
     template < typename FieldType, typename T >
@@ -258,6 +260,8 @@ namespace internal {
 
         virtual void update_host() noexcept override { field_helper::d2h_update(field_); }
 
+        virtual bool is_on_host() const noexcept override { return field_.is_on_host(); }
+
       private:
         FieldType &field_;
     };
@@ -330,6 +334,8 @@ namespace internal {
 
         virtual void update_host() noexcept override { field_helper::d2h_update(field_); }
 
+        virtual bool is_on_host() const noexcept override { return field_.is_on_host(); }
+
       private:
         typename FieldType::storage_info_type metaData_;
         FieldType field_;
@@ -496,6 +502,8 @@ class type_erased_field_view {
      */
     void update_host() const noexcept { base_->update_host(); }
 
+    bool is_on_host() const noexcept { return base_->is_on_host(); }
+
   private:
     std::shared_ptr< internal::type_erased_field_interface< T > > base_;
 };
@@ -639,6 +647,8 @@ class type_erased_field {
      */
     void update_host() const noexcept { base_->update_host(); }
 
+    bool is_on_host() const noexcept { return base_->is_on_host(); }
+
     /**
      * @brief Convert field to view
      */