JHashCollection.cc

Go to the documentation of this file.

#include <iostream>
#include <iomanip>
#include <cmath>

#include "JTools/JHashCollection.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


namespace {

  /**
   * Example class to get value for hash key.
   */
  struct get_value {
    /**
     * Constructor.
     *
     * \param  precision     precision
     */
    get_value(const double precision = 1.0)
    {
      this->precision = precision;
    }
    
    
    /*
     * Function.
     *
     * \param  key           key
     * \return               hash value
     */
    inline int operator()(const double key) const
    {
      return (int) floor(key / precision);
    }

    
    double precision;
  };
}


/**
 * \file
 *
 * Example program to test JTOOLS::JHashCollection class.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;

  double precision;
  int    debug;

  try {

    JParser<> zap("Example program to test hash collection.");

    zap['e'] = make_field(precision) = 1.0e-3;
    zap['d'] = make_field(debug)     = 0;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  using namespace JPP;

  typedef JHashCollection<double, get_value>   hash_collection;
  
  hash_collection buffer(precision);

  for (double x = 2.0; x >= 1.0; x -= 0.1) {
    buffer.insert(x);
  }

  for (hash_collection::const_iterator i = buffer.begin(); i != buffer.end(); ++i) {
    cout << *i << endl;
  }
}