[PL] Pass output stream to Process::post().

Applications/CLI/ogs.cpp

@@ -83,13 +83,19 @@ int main(int argc, char *argv[])
 		(*p_it)->initialize();
 	}
 
+	std::string const output_file_name(project.getOutputFilePrefix() + "_result.dat");
+	DBUG("Create output file %s", output_file_name.c_str());
+	std::ofstream output_file(output_file_name);
+
 	INFO("Solve processes.");
 	for (auto p_it = project.processesBegin(); p_it != project.processesEnd(); ++p_it)
 	{
 		(*p_it)->solve();
-		(*p_it)->post();
+		(*p_it)->post(output_file);
 	}
 
+	output_file.close();
+
 	delete fmt;
 	delete logog_cout;
 	LOGOG_SHUTDOWN();

ProcessLib/GroundwaterFlowProcess.h

@@ -133,7 +133,7 @@ public:
         _linearSolver->solve(*_rhs, *_x);
     }
 
-    void post()
+    void post(std::ostream& os)
     {
         DBUG("Postprocessing GroundwaterFlowProcess.");
         // Postprocessing of the linear system of equations solver results:

ProcessLib/Process.h

@@ -28,7 +28,10 @@ public:
 
     virtual void initialize() = 0;
     virtual void solve() = 0;
-    virtual void post() = 0;
+
+    /// Postprocessing after solve().
+    /// The output stream is dedicated for the ascii result output.
+    virtual void post(std::ostream& os) = 0;
 
 protected:
     MeshLib::Mesh const& _mesh;