text: // model_builder.hpp
  
  #include <ghost/model_builder.hpp>
  
  #include "../../c++/src/DataFrame.hpp"
  
  #include "instance_data.hpp"
  
  class LPOBuilder : public ghost::ModelBuilder {
  
  		instance_data _instance;
  
  	public:
  
  		/*!
  		 * \brief default constructor
  		*/
  		LPOBuilder();
  
  		void declare_variables() override;
  		void declare_constraints() override;
  		void declare_objective() override;
  
  };
  