diff options
author | Boris Kolpackov <boris@codesynthesis.com> | 2013-02-05 15:50:07 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2013-02-05 15:50:40 +0200 |
commit | e93dcc2ecabee46d31aedf9f4ddc8058956c78ad (patch) | |
tree | e4a40ef98f4534cd9f3090b2d69e07f04642dcfb /odb/qt/containers/list-traits.txx | |
parent | 5ddc3cc84883aef3fbb5ab8991ad36c0185404ac (diff) |
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.
Diffstat (limited to 'odb/qt/containers/list-traits.txx')
-rw-r--r-- | odb/qt/containers/list-traits.txx | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/odb/qt/containers/list-traits.txx b/odb/qt/containers/list-traits.txx new file mode 100644 index 0000000..48cf28e --- /dev/null +++ b/odb/qt/containers/list-traits.txx @@ -0,0 +1,73 @@ +// file : odb/qt/containers/list-traits.txx +// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +namespace odb +{ + template <typename V> + void access::container_traits<QOdbList<V> >:: + 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 (); + } + } +} |