Columns are unique, not shared

4 files changed, 4 insertions, 4 deletions

diff --git a/libdbpp/column.h b/libdbpp/column.h
index ae7634f..94d597b 100644
--- a/libdbpp/column.h
+++ b/libdbpp/column.h
@@ -115,7 +115,7 @@ namespace DB {
 			/// This column's name.
 			const std::string		name;
 	};
-	typedef std::shared_ptr<Column> ColumnPtr;
+	typedef std::unique_ptr<Column> ColumnPtr;
 }
 
 #endif
diff --git a/libdbpp/selectcommand.cpp b/libdbpp/selectcommand.cpp
index 1e67ce6..96b3276 100644
--- a/libdbpp/selectcommand.cpp
+++ b/libdbpp/selectcommand.cpp
@@ -73,10 +73,10 @@ DB::SelectCommand::columnCount() const
 	return columns->size();
 }
 
-DB::ColumnPtr
+const DB::ColumnPtr &
 DB::SelectCommand::insertColumn(ColumnPtr col)
 {
-	return *columns->insert(col).first;
+	return *columns->insert(std::move(col)).first;
 }
 
 DB::RowBase::RowBase(SelectCommand * s) :
diff --git a/libdbpp/selectcommand.h b/libdbpp/selectcommand.h
index 05ec2ce..2fb9253 100644
--- a/libdbpp/selectcommand.h
+++ b/libdbpp/selectcommand.h
@@ -128,7 +128,7 @@ namespace DB {
 
 		protected:
 			/// Helper function so clients need not know about boost::multi_index_container.
-			ColumnPtr insertColumn(ColumnPtr);
+			const ColumnPtr & insertColumn(ColumnPtr);
 
 			class Columns;
 
diff --git a/libdbpp/unittests/libdbpp-postgresql b/libdbpp/unittests/libdbpp-postgresql
-Subproject 36d1ebb68359d7faa194a1f62c17011b462a3a1
+Subproject a0cedddde5ad16e2b885d3dd0b57b3e613a796a