From 2b856f69d490f6cedffac03ecbed8fef318ecc43 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 5 Feb 2013 15:50:06 +0200
Subject: Add support for change-tracking containers

ODB now supports "smart" ordered containers. Such containers get extra
functions for updating and deleting individual elements. Based on this
functionality implement two change-tracking containers: odb::vector
(equivalent to std::vector) and QOdbList (equivalent to QList). New
tests: common/container/change-tracking and qt/common/container/change-
tracking.
---
 odb/vector-traits.txx | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 odb/vector-traits.txx

(limited to 'odb/vector-traits.txx')

diff --git a/odb/vector-traits.txx b/odb/vector-traits.txx
new file mode 100644
index 0000000..255b074
--- /dev/null
+++ b/odb/vector-traits.txx
@@ -0,0 +1,73 @@
+// file      : odb/vector-traits.txx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  template <typename V, typename A>
+  void access::container_traits<vector<V, A> >::
+  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 ();
+    }
+  }
+}
-- 
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