HistogramInterface.h

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// Copyright 2019-2023 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#ifndef RANS_INTERNAL_CONTAINERS_HISTOGRAMINTERFACE_H_
#define RANS_INTERNAL_CONTAINERS_HISTOGRAMINTERFACE_H_
 
#include <gsl/span>
 
#include "rANS/internal/common/utils.h"
 
namespace o2::rans::internal
{
 
template <class source_T, class value_T, class difference_T, class derived_T>
class HistogramInterface
{
 
 public:
  using source_type = source_T;
  using value_type = value_T;
  using difference_type = difference_T;
 
  // operations
  template <typename source_IT>
  inline derived_T& addSamples(source_IT begin, source_IT end)
  {
    static_assert(utils::isCompatibleIter_v<source_type, source_IT>);
 
    if (begin == end) {
      return static_cast<derived_T&>(*this);
    } else {
      return static_cast<derived_T*>(this)->addSamples(begin, end);
    }
  };
 
  inline derived_T& addSamples(gsl::span<const source_type> samples)
  {
    return addSamples(samples.data(), samples.data() + samples.size());
  };
 
  template <typename freq_IT>
  inline derived_T& addFrequencies(freq_IT begin, freq_IT end, difference_type offset)
  {
    static_assert(utils::isCompatibleIter_v<value_type, freq_IT>);
 
    if (begin == end) {
      return static_cast<derived_T&>(*this);
    } else {
      return static_cast<derived_T*>(this)->addFrequencies(begin, end, offset);
    }
  };
 
  inline derived_T& addFrequencies(gsl::span<const value_type> frequencies, difference_type offset)
  {
    return addFrequencies(frequencies.data(), frequencies.data() + frequencies.size(), offset);
  };
 
  derived_T& operator+(derived_T& other)
  {
    return addFrequencies(other.cbegin(), other.cbegin(), other.getOffset());
  };
 
 protected:
  HistogramInterface() = default;
 
  template <typename freq_IT>
  HistogramInterface(freq_IT begin, freq_IT end, difference_type offset)
  {
    static_assert(utils::isIntegralIter_v<freq_IT>);
    addFrequencies(begin, end, offset);
  };
};
 
} // namespace o2::rans::internal
 
#endif /* RANS_INTERNAL_CONTAINERS_HISTOGRAMINTERFACE_H_ */