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-rw-r--r--odb/details/meta/static-assert.hxx33
-rw-r--r--odb/schema-catalog.hxx66
2 files changed, 91 insertions, 8 deletions
diff --git a/odb/details/meta/static-assert.hxx b/odb/details/meta/static-assert.hxx
new file mode 100644
index 0000000..6bb84f2
--- /dev/null
+++ b/odb/details/meta/static-assert.hxx
@@ -0,0 +1,33 @@
+// file : odb/details/meta/static-assert.hxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_DETAILS_META_STATIC_ASSERT_HXX
+#define ODB_DETAILS_META_STATIC_ASSERT_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/details/config.hxx> // ODB_CXX11
+
+#ifndef ODB_CXX11
+
+namespace odb
+{
+ namespace details
+ {
+ namespace meta
+ {
+ template <bool>
+ struct static_assert_test;
+
+ template <>
+ struct static_assert_test<true> {};
+ }
+ }
+}
+
+#endif
+
+#include <odb/post.hxx>
+
+#endif // ODB_DETAILS_META_STATIC_ASSERT_HXX
diff --git a/odb/schema-catalog.hxx b/odb/schema-catalog.hxx
index c02de4a..968cbdc 100644
--- a/odb/schema-catalog.hxx
+++ b/odb/schema-catalog.hxx
@@ -19,6 +19,8 @@
#include <odb/forward.hxx> // schema_version, odb::core
#include <odb/details/export.hxx>
+#include <odb/details/unused.hxx>
+#include <odb/details/meta/static-assert.hxx>
namespace odb
{
@@ -77,8 +79,60 @@ namespace odb
typedef void (*data_migration_function_type) (database&);
#endif
+ // The following three variants of the registration functions make
+ // sure that the version is greater that the base model version.
+ // This helps with identifying and removing data migration function
+ // that are no longer required.
+ //
// Data migration functions are called in the order of registration.
//
+ template <schema_version v, schema_version base>
+ static void
+ data_migration_function (data_migration_function_type f,
+ const std::string& name = "")
+ {
+ data_migration_function<v, base> (id_common, f, name);
+ }
+
+ // Database-specific data migration.
+ //
+ template <schema_version v, schema_version base>
+ static void
+ data_migration_function (database& db,
+ data_migration_function_type f,
+ const std::string& name = "")
+ {
+ data_migration_function<v, base> (db.id (), f, name);
+ }
+
+ template <schema_version v, schema_version base>
+ static void
+ data_migration_function (database_id id,
+ data_migration_function_type f,
+ const std::string& name = "")
+ {
+ // If the data migration version is below the base model version
+ // then it will never be called.
+ //
+#ifdef ODB_CXX11
+ static_assert (v > base || base == 0,
+ "data migration function is no longer necessary");
+#else
+ // Poor man's static_assert.
+ //
+ typedef details::meta::static_assert_test<(v > base || base == 0)>
+ data_migration_function_is_no_longer_necessary;
+
+ char sa [sizeof (data_migration_function_is_no_longer_necessary)];
+ ODB_POTENTIALLY_UNUSED (sa);
+#endif
+
+ data_migration_function (id, v, f, name);
+ }
+
+ // The same as above but take the version as an argument and do
+ // not check whether it is greater than the base model version.
+ //
static void
data_migration_function (schema_version v,
data_migration_function_type f,
@@ -87,8 +141,6 @@ namespace odb
data_migration_function (id_common, v, f, name);
}
- // Database-specific data migration.
- //
static void
data_migration_function (database& db,
schema_version v,
@@ -175,23 +227,21 @@ namespace odb
// Static data migration function registration.
//
+ template <schema_version v, schema_version base>
struct LIBODB_EXPORT data_migration_entry
{
typedef schema_catalog::data_migration_function_type function_type;
- data_migration_entry (schema_version v,
- function_type f,
- const std::string& name = "")
+ data_migration_entry (function_type f, const std::string& name = "")
{
- schema_catalog::data_migration_function (v, f, name);
+ schema_catalog::data_migration_function<v, base> (f, name);
}
data_migration_entry (database_id id,
- schema_version v,
function_type f,
const std::string& name = "")
{
- schema_catalog::data_migration_function (id, v, f, name);
+ schema_catalog::data_migration_function<v, base> (id, v, f, name);
}
};