store start solution for gurobi

NSolver/GUROBISolver.cc

@@ -132,9 +132,16 @@ solve(NProblemInterface*                  _problem,
     for (int i = 0; i < _problem->n_unknowns(); ++i)
       vars[i].set(GRB_DoubleAttr_Start, start[i]);
 
+
     // Integrate new variables
     model.update();
 
+    if (!start_solution_output_path_.empty())
+    {
+      std::cout << "Writing problem's start solution into file \"" << start_solution_output_path_ << "\"." << std::endl;
+      model.write(start_solution_output_path_);
+    }
+
     //----------------------------------------------
     // 2. setup constraints
     //----------------------------------------------
@@ -929,6 +936,19 @@ set_problem_output_path( const std::string &_problem_output_path)
 //-----------------------------------------------------------------------------
 
 
+void
+GUROBISolver::
+set_start_solution_output_path(const std::string& _start_solution_output_path)
+{
+  std::stringstream ss;
+  ss << _start_solution_output_path << ".mst";
+  start_solution_output_path_ = ss.str();
+}
+
+
+//-----------------------------------------------------------------------------
+
+
 void
 GUROBISolver::
 set_problem_env_output_path( const std::string &_problem_env_output_path)

NSolver/GUROBISolver.hh

@@ -104,9 +104,10 @@ public:
   }
 
 
-  void set_problem_output_path    ( const std::string &_problem_output_path);
-  void set_problem_env_output_path( const std::string &_problem_env_output_path);
-  void set_solution_input_path    ( const std::string &_solution_input_path);
+  void set_problem_output_path       ( const std::string &_problem_output_path);
+  void set_start_solution_output_path( const std::string &_start_solution_output_path);
+  void set_problem_env_output_path   ( const std::string &_problem_env_output_path);
+  void set_solution_input_path       ( const std::string &_solution_input_path);
 
 protected:
   double* P(std::vector<double>& _v)
@@ -122,6 +123,7 @@ private:
   // filenames for exporting/importing gurobi solutions
   // if string is empty nothing is imported or exported
   std::string problem_output_path_;
+  std::string start_solution_output_path_;
   std::string problem_env_output_path_;
   std::string solution_input_path_;
 };