MinMax.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
 
#pragma once
 
#include <string>
#include <utility> // std::pair
#include <limits>       // std::numeric_limits
 
 
namespace Belle2 {
  class MinMax {
  protected:
    std::pair<double, double> m_minMax; 
  public:
 
    MinMax() :
      m_minMax({std::numeric_limits< double >::max(), -std::numeric_limits< double >::max()}) {}
 
    void reset() { m_minMax = {std::numeric_limits< double >::max(), -std::numeric_limits< double >::max()}; }
 
    bool checkAndReplaceIfMinMax(double newVal)
    {
      bool wasAdded = false;
      if (newVal < m_minMax.first) { m_minMax.first = newVal; wasAdded = true; }
      if (m_minMax.second < newVal) { m_minMax.second = newVal; wasAdded = true; }
      return wasAdded;
    }
 
    double getMin() const { return m_minMax.first; } 
    double getMax() const { return m_minMax.second; } 
    std::string print() const
    {
      std::string min = m_minMax.first == std::numeric_limits< double >::max() ? "max<double>" : std::to_string(m_minMax.first);
      std::string max = m_minMax.second == -std::numeric_limits< double >::max() ? "min<double>" : std::to_string(m_minMax.second);
      return "min: " + min + ", max: " + max;
    } 
  };
}