prime2 is added and readme update

src/PostprocessData/operation/postprocessOperation/postprocessOperationFunctions.hpp

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+/*------------------------------- 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 __postprocessOperationFunctions_hpp__
+#define __postprocessOperationFunctions_hpp__
+
+#include <variant>
+
+#include "types.hpp"
+#include "iOstream.hpp"
+#include "regionField.hpp"
+
+namespace pFlow
+{
+
+/// Type alias for processed region field types.
+/// Only regionField<real>, regionField<realx3>, and regionField<realx4> are supported
+/// in the postprocessOperation class.
+using processedRegFieldType = std::variant
+<
+    regionField<real>,
+    regionField<realx3>,
+    regionField<realx4>
+>;
+
+
+template<typename T>
+inline
+bool writeField
+(
+    iOstream&             os,
+    timeValue             t,
+    const regionField<T>  field,
+    uint32                threshold,
+    const T&              defValue=T{}    
+)
+{
+    const auto& regPoints = field.regPoints();
+    const uint32 n = field.size();
+    os<<t<<tab;
+    for(uint32 i=0; i<n; i++)
+    {
+        auto numPar = regPoints.indices(i).size();
+        if(numPar >= threshold)
+        {
+            if constexpr(std::is_same_v<T,realx3>)
+            {
+                os<<field[i].x()<<' '<<field[i].y()<<' '<<field[i].z()<<tab;
+            }
+            else if constexpr( std::is_same_v<T,realx4>)
+            {
+                os << field[i].x() << ' ' << field[i].y() << ' ' << field[i].z() << ' ' << field[i].w() << tab;
+            }
+            else
+            {
+                os<<field[i]<<tab;
+            }
+            
+        }
+        else
+        {
+            if constexpr(std::is_same_v<T,realx3>)
+            {
+                os<<defValue.x()<<' '<<defValue.y()<<' '<<defValue.z()<<tab;
+            }
+            else if constexpr( std::is_same_v<T,realx4>)
+            {
+                os << defValue.x() << ' ' << defValue.y() << ' ' << defValue.z() << ' ' << defValue.w() << tab;
+            }
+            else
+            {
+                os<<defValue<<tab;
+            }
+        }
+
+    }
+    os<<endl;
+    return true;
+}
+
+} // namespace pFlow
+
+#endif //__postprocessOperationFunctions_hpp__