diff options
author | Boris Kolpackov <boris@codesynthesis.com> | 2013-02-05 15:50:06 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2013-02-05 15:50:06 +0200 |
commit | 2b856f69d490f6cedffac03ecbed8fef318ecc43 (patch) | |
tree | 0876ef0d3539bb313a9dd66659e805e6980399aa /odb/vector-traits.hxx | |
parent | 20daa3c4285c91dfcd35361f6550f80315e008a5 (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/vector-traits.hxx')
-rw-r--r-- | odb/vector-traits.hxx | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/odb/vector-traits.hxx b/odb/vector-traits.hxx new file mode 100644 index 0000000..874480b --- /dev/null +++ b/odb/vector-traits.hxx @@ -0,0 +1,104 @@ +// file : odb/vector-traits.hxx +// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC +// license : GNU GPL v2; see accompanying LICENSE file + +#ifndef ODB_VECTOR_TRAITS_HXX +#define ODB_VECTOR_TRAITS_HXX + +#include <odb/pre.hxx> + +#include <odb/vector.hxx> +#include <odb/vector-impl.hxx> +#include <odb/container-traits.hxx> +#include <odb/transaction.hxx> + +namespace odb +{ + template <typename V, typename A> + class access::container_traits<vector<V, A> > + { + public: + static const container_kind kind = ck_ordered; + static const bool smart = true; + + typedef vector<V, A> container_type; + + typedef V value_type; + typedef typename container_type::size_type index_type; + + typedef smart_ordered_functions<index_type, value_type> functions; + typedef ordered_functions<index_type, value_type> dumb_functions; + + public: + static void + persist (const container_type& c, const functions& f) + { + for (index_type i (0), n (c.size ()); i < n; ++i) + f.insert (i, c[i]); + + // Now that this container is persistent, start tracking changes. + // + c._start (); + } + + static void + load (container_type& c, bool more, const functions& f) + { + // Stop tracking changes. + // + c._stop (); + + // Load. + // + c.clear (); + while (more) + { + index_type dummy; + c.push_back (value_type ()); + more = f.select (dummy, c.modify_back ()); + } + + // Start tracking changes. + // + c._start (); + } + + static void + update (const container_type&, const functions&); + + static void + erase (const container_type* c, const functions& f) + { + f.delete_ (0); + + // Stop tracking changes. + // + if (c != 0) + c->_stop (); + } + + // Version of load() for dumb functions. Used to support + // inverse members of the container type. The implementation + // is identical to the smart one except we don't turn off/on + // change tracking. + // + static void + load (container_type& c, bool more, const dumb_functions& f) + { + c.clear (); + + while (more) + { + index_type dummy; + c.push_back (value_type ()); + more = f.select (dummy, c.modify_back ()); + } + } + }; +} + +#include <odb/vector-traits.txx> + +#include <odb/post.hxx> + +#endif // ODB_VECTOR_TRAITS_HXX |