1 files changed, 100 insertions, 0 deletions
diff --git a/libodb/odb/vector-traits.txx b/libodb/odb/vector-traits.txx
new file mode 100644
index 0000000..6c33876
--- /dev/null
+++ b/libodb/odb/vector-traits.txx
@@ -0,0 +1,100 @@
+// file      : odb/vector-traits.txx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  template <typename V, typename A LIBODB_VECTOR_ARG_DECL>
+  bool access::container_traits<vector<V, A LIBODB_VECTOR_ARG_USE> >::
+  changed (const container_type& c)
+  {
+    // Because modifications can cancel each other (e.g., push and pop),
+    // it is tricky to keep track of whether there are any changes in
+    // the container. Instead, we are just going to examine each element
+    // just like update().
+    //
+
+    // We should either be tracking or summarily changed.
+    //
+    if (c._tracking ())
+    {
+      const vector_impl& impl (c._impl ());
+
+      for (std::size_t i (0), n (impl.size ()); i < n; ++i)
+      {
+        if (impl.state (i) != vector_impl::state_unchanged)
+          return true;
+      }
+    }
+    else
+      return true;
+
+    return false;
+  }
+
+  template <typename V, typename A LIBODB_VECTOR_ARG_DECL>
+  void access::container_traits<vector<V, A LIBODB_VECTOR_ARG_USE> >::
+  update (const container_type& c, const functions& f)
+  {
+    bool u (false); // Updated flag.
+
+    if (c._tracking ())
+    {
+      const vector_impl& impl (c._impl ());
+
+      for (std::size_t i (0), n (impl.size ()); i < n; ++i)
+      {
+        vector_impl::element_state_type s (impl.state (i));
+
+        switch (s)
+        {
+        case vector_impl::state_unchanged:
+          {
+            break;
+          }
+        case vector_impl::state_inserted:
+          {
+            f.insert (i, c[static_cast<index_type> (i)]);
+            u = u || true;
+            break;
+          }
+        case vector_impl::state_updated:
+          {
+            f.update (i, c[static_cast<index_type> (i)]);
+            u = u || true;
+            break;
+          }
+        case vector_impl::state_erased:
+          {
+            f.delete_ (i); // Delete from i onwards.
+            u = u || true;
+            break;
+          }
+        }
+
+        // We delete all trailing elements in one go.
+        //
+        if (s == vector_impl::state_erased)
+          break;
+      }
+    }
+    else
+    {
+      // Fall back to delete all/insert all.
+      //
+      f.delete_ (0);
+
+      for (index_type i (0), n (c.size ()); i < n; ++i)
+        f.insert (i, c[i]);
+
+      u = true;
+    }
+
+    // Arm the rollback callback and (re)start change tracking.
+    //
+    if (u)
+    {
+      c._arm (transaction::current ());
+      c._start ();
+    }
+  }
+}