random-graph.hh

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#ifndef __MINLCA_UTILS_GENERATORS_RANDOM_HH
#define __MINLCA_UTILS_GENERATORS_RANDOM_HH

#include <lemon/random.h>


namespace minlca
{
namespace utils
{

template<typename Graph = lemon::SmartGraph>
class RandomGraph : public Graph
{
protected:
  lemon::Random *_r; 
  bool _delete_random; 

public:
  template<typename Number = int>
  RandomGraph(
    Number seed = 0 
  ) : Graph(), _r(nullptr), _delete_random(true)
  {
    _r = new lemon::Random(seed);
  }

  RandomGraph(
    lemon::Random &r 
  ) : Graph(), _r(&r), _delete_random(false)
  {
  }

  ~RandomGraph()
  {
    if (_delete_random) {
      delete _r;
    }
  }

  template<typename Number>
  void seed(
    Number seed 
  )
  {
    if (not _delete_random) {
      _r = new lemon::Random(seed);
      _delete_random = true;
    }
    else {
      _r->seed(seed);
    }
  }

  void changeRandom(
    lemon::Random &r 
  )
  {
    if (_delete_random) {
      delete _r;
    }

    _r = &r;
    _delete_random = false;
  }

  virtual void generate() = 0;
};
}
}

#endif