csparse_wrapper.h

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// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle, G. Grisetti, W. Burgard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
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#ifndef G2O_CSPARSE_WRAPPER_H
#define G2O_CSPARSE_WRAPPER_H
 
#include <cstddef>
#include <memory>
 
#include "g2o/core/eigen_types.h"
 
namespace g2o {
namespace csparse {
 
class CSparse {
 public:
  CSparse();
  ~CSparse();

  struct SparseView {
    int& m;
    int& n;
    int& nzmax;
    int*& p;
    int*& i;
    double*& x;
    int& columnsAllocated;
    SparseView(int& m, int& n, int& nzmax, int*& p, int*& i, double*& x,
               int& columnsAllocated)
        : m(m),
          n(n),
          nzmax(nzmax),
          p(p),
          i(i),
          x(x),
          columnsAllocated(columnsAllocated) {}
  };

  struct FactorView {
    int& n;
    int*& p;
    int*& i;
    double*& x;
    int*& pinv;
    FactorView(int& n, int*& p, int*& i, double*& x, int*& pinv)
        : n(n), p(p), i(i), x(x), pinv(pinv) {}
  };
 
  bool factorize();
  bool hasFactor() const;
  void freeFactor();
  FactorView factor();

  bool amd(const SparseView& sparseView, VectorXI& result);
 
  int choleskyNz() const;
 
  bool solve(double* x, double* b) const;
 
  bool analyze();
  bool analyze_p(int* permutation);
 
  bool hasSymbolic() const;
  void freeSymbolic();
 
  SparseView sparseView();
  bool writeSparse(const std::string& filename) const;
 
 private:
  class Impl;
  std::unique_ptr<Impl> pImpl;
};
 
}  // namespace csparse
}  // namespace g2o
#endif