The main structure is tested. functons like execute and write are added and tested.

other components are left

src/PostprocessData/operation/PostprocessOperation/PostprocessOperationSum.hpp

@@ -0,0 +1,74 @@
+/*------------------------------- phasicFlow ---------------------------------
+      O        C enter of
+     O O       E ngineering and
+    O   O      M ultiscale modeling of
+   OOOOOOO     F luid flow
+------------------------------------------------------------------------------
+  Copyright (C): www.cemf.ir
+  email: hamid.r.norouzi AT gmail.com
+------------------------------------------------------------------------------
+Licence:
+  This file is part of phasicFlow code. It is a free software for simulating
+  granular and multiphase flows. You can redistribute it and/or modify it under
+  the terms of GNU General Public License v3 or any other later versions.
+
+  phasicFlow is distributed to help others in their research in the field of
+  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+-----------------------------------------------------------------------------*/
+
+#ifndef __PostprocessOperationSum_hpp__
+#define __PostprocessOperationSum_hpp__
+
+#include <variant>
+#include <vector>
+
+#include "postprocessOperation.hpp"
+#include "regionField.hpp"
+#include "includeMask.hpp"
+
+namespace pFlow
+{
+
+
+class PostprocessOperationSum
+:
+    public postprocessOperation
+{
+private:
+           
+    /// Pointer to the include mask used for masking operations.
+    uniquePtr<processedRegFieldType>  processedRegField_ = nullptr;
+
+public:
+
+    TypeInfo("PostprocessOperation<sum>");
+
+    PostprocessOperationSum(
+        const dictionary& opDict,
+        const regionPoints& regPoints,
+        fieldsDataBase& fieldsDB);
+    
+    ~PostprocessOperationSum() override = default;
+
+    add_vCtor
+    (
+        postprocessOperation,
+        PostprocessOperationSum,
+        dictionary
+    );
+
+    const processedRegFieldType& processedField()const override
+    {
+        return processedRegField_();
+    }
+
+    bool execute(const std::vector<span<real>>& weights) override;
+
+}; 
+
+
+}
+
+#endif //__PostprocessOperation_hpp__