LinearSolver.h

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#ifndef LINEARSOLVER_H
#define LINEARSOLVER_H
 
#include "../app.h"
#include "../types/AlternativesPerformance.h"
#include "ortools/linear_solver/linear_solver.h"
#include "spdlog/spdlog.h"
 
#include <string>
 
class LinearSolver {
public:
  LinearSolver(AlternativesPerformance &ap, Config &conf,
               float delta = 0.000001, std::string solver = "GLOP");
 
  ~LinearSolver();
 
  void initializeSolver();
 
  void updateConstraints(std::vector<std::vector<std::vector<bool>>> x_matrix,
                         std::vector<std::vector<std::vector<bool>>> y_matrix);
 
  std::pair<float, std::vector<float>>
  solve(std::vector<std::vector<std::vector<bool>>> x_matrix,
        std::vector<std::vector<std::vector<bool>>> y_matrix);
 
  AlternativesPerformance &getAlternativesPerformance() const;
 
  operations_research::MPSolver *getSolver() const;
 
  std::vector<operations_research::MPVariable *> getWeights() const;
 
  std::vector<operations_research::MPVariable *> getXa() const;
 
  std::vector<operations_research::MPVariable *> getXap() const;
 
  std::vector<operations_research::MPVariable *> getYa() const;
 
  std::vector<operations_research::MPVariable *> getYap() const;
 
  Config getConf() const;
 
private:
  AlternativesPerformance &ap;
  operations_research::MPSolver *solver;
  std::string solver_name;
  Config &conf;
 
  // value use to transform strict inequalities into non-strict ones
  float delta;
 
  // variables
  std::vector<operations_research::MPVariable *> x_a;
  std::vector<operations_research::MPVariable *> x_ap;
  std::vector<operations_research::MPVariable *> y_a;
  std::vector<operations_research::MPVariable *> y_ap;
  std::vector<operations_research::MPVariable *> weights;
  operations_research::MPVariable *lambda;
 
  // constraints
  std::vector<operations_research::MPConstraint *> x_constraints;
  std::vector<operations_research::MPConstraint *> y_constraints;
  std::vector<operations_research::MPConstraint *> weights_constraint;
};
 
#endif