--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancFramework/Sources/SQLite/IScalarFunction.h	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,58 @@
+/**
+ * Orthanc - A Lightweight, RESTful DICOM Store
+ *
+ * Copyright (C) 2012-2016 Sebastien Jodogne <s.jodogne@orthanc-labs.com>,
+ * Medical Physics Department, CHU of Liege, Belgium
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *    * Neither the name of the CHU of Liege, nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ **/
+
+
+#pragma once
+
+#include "NonCopyable.h"
+#include "FunctionContext.h"
+
+namespace Orthanc
+{
+  namespace SQLite
+  {
+    class IScalarFunction : public NonCopyable
+    {
+    public:
+      virtual ~IScalarFunction()
+      {
+      }
+
+      virtual const char* GetName() const = 0;
+
+      virtual unsigned int GetCardinality() const = 0;
+
+      virtual void Compute(FunctionContext& context) = 0;
+    };
+  }
+}