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-rw-r--r--odb/database.hxx4
1 files changed, 2 insertions, 2 deletions
diff --git a/odb/database.hxx b/odb/database.hxx
index 2e6c79d..5ec98a7 100644
--- a/odb/database.hxx
+++ b/odb/database.hxx
@@ -177,8 +177,8 @@ namespace odb
// Transactions.
//
public:
- transaction_impl*
- begin ();
+ virtual transaction_impl*
+ begin () = 0;
// Connections.
//