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authorBoris Kolpackov <boris@codesynthesis.com>2013-08-14 15:16:09 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2013-08-14 15:16:09 +0200
commitab52a8c4e7f92358cabf1c81de3ddcc68c1b7090 (patch)
tree7e6dd48b43410d5577efe1944cf04900b122430f
parent4077a3636154b8638daf34992a34475f3ba8de5d (diff)
Add support for object sections
Sections are an optimization mechanism that allows the partitioning of data members of a persistent class into groups that can be separately loaded and/or updated.
-rw-r--r--odb/qt/containers/list-traits.hxx3
-rw-r--r--odb/qt/containers/list-traits.txx28
2 files changed, 31 insertions, 0 deletions
diff --git a/odb/qt/containers/list-traits.hxx b/odb/qt/containers/list-traits.hxx
index 17e7765..6541d3f 100644
--- a/odb/qt/containers/list-traits.hxx
+++ b/odb/qt/containers/list-traits.hxx
@@ -64,6 +64,9 @@ namespace odb
c._start ();
}
+ static bool
+ changed (const container_type&);
+
static void
update (const container_type&, const functions&);
diff --git a/odb/qt/containers/list-traits.txx b/odb/qt/containers/list-traits.txx
index 2893236..8af5c85 100644
--- a/odb/qt/containers/list-traits.txx
+++ b/odb/qt/containers/list-traits.txx
@@ -5,6 +5,34 @@
namespace odb
{
template <typename V>
+ bool access::container_traits<QOdbList<V> >::
+ 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>
void access::container_traits<QOdbList<V> >::
update (const container_type& c, const functions& f)
{