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diff --git a/include/gudhi/writing_persistence_to_file.h b/include/gudhi/writing_persistence_to_file.h
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--- a/include/gudhi/writing_persistence_to_file.h
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-/*    This file is part of the Gudhi Library. The Gudhi library
- *    (Geometric Understanding in Higher Dimensions) is a generic C++
- *    library for computational topology.
- *
- *    Author(s):       Pawel Dlotko
- *
- *    Copyright (C) 2017  Swansea University, UK
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU General Public License as published by
- *    the Free Software Foundation, either version 3 of the License, or
- *    (at your option) any later version.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU General Public License for more details.
- *
- *    You should have received a copy of the GNU General Public License
- *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef WRITING_PERSISTENCE_TO_FILE_H_
-#define WRITING_PERSISTENCE_TO_FILE_H_
-
-#include <iostream>
-#include <string>
-#include <limits>
-
-namespace Gudhi {
-
-/**
-* This is a class to store persistence intervals. Its main purpose is to
-* exchange data in between different packages and provide unified way
-* of writing a collection of persistence intervals to file.
-**/
-template <typename Filtration_type, typename Coefficient_field>
-class Persistence_interval_common {
- public:
-  /**
-   * Constructor taking as an input birth and death of the pair.
-  **/
-  Persistence_interval_common(Filtration_type birth, Filtration_type death)
-      : birth_(birth),
-        death_(death),
-        dimension_(std::numeric_limits<unsigned>::max()),
-        arith_element_(std::numeric_limits<Coefficient_field>::max()) {}
-
-  /**
-   * Constructor taking as an input birth, death and dimension of the pair.
-  **/
-  Persistence_interval_common(Filtration_type birth, Filtration_type death, unsigned dim)
-      : birth_(birth), death_(death), dimension_(dim), arith_element_(std::numeric_limits<Coefficient_field>::max()) {}
-
-  /**
-* Constructor taking as an input birth, death, dimension of the pair as well
-* as the number p such that this interval is present over Z_p field.
-**/
-  Persistence_interval_common(Filtration_type birth, Filtration_type death, unsigned dim, Coefficient_field field)
-      : birth_(birth), death_(death), dimension_(dim), arith_element_(field) {}
-
-  /**
-   * Operator to compare two persistence pairs. During the comparision all the
-   * fields: birth, death, dimensiona and arith_element_ are taken into account
-   * and they all have to be equal for two pairs to be equal.
-  **/
-  bool operator==(const Persistence_interval_common& i2) const {
-    return ((this->birth_ == i2.birth_) && (this->death_ == i2.death_) && (this->dimension_ == i2.dimension_) &&
-            (this->arith_element_ == i2.arith_element_));
-  }
-
-  /**
-   * Check if two persistence paris are not equal.
-  **/
-  bool operator!=(const Persistence_interval_common& i2) const { return (!((*this) == i2)); }
-
-  /**
-   * Operator to compare objects of a type Persistence_interval_common.
-   * One intervals is smaller than the other if it has lower persistence.
-   * Note that this operator do not take Arith_element into account when doing comparisions.
-  **/
-  bool operator<(const Persistence_interval_common& i2) const {
-    return fabs(this->death_ - this->birth_) < fabs(i2.death_ - i2.birth_);
-  }
-
-  friend std::ostream& operator<<(std::ostream& out, const Persistence_interval_common& it) {
-    if (it.arith_element_ != std::numeric_limits<Coefficient_field>::max()) {
-      out << it.arith_element_ << "  ";
-    }
-    if (it.dimension_ != std::numeric_limits<unsigned>::max()) {
-      out << it.dimension_ << " ";
-    }
-    out << it.birth_ << " " << it.death_ << " ";
-    return out;
-  }
-
- private:
-  Filtration_type birth_;
-  Filtration_type death_;
-  unsigned dimension_;
-  Coefficient_field arith_element_;
-};
-
-/**
- * This function write a vector<Persistence_interval_common> to a stream
-**/
-template <typename Persistence_interval_range>
-void write_persistence_intervals_to_stream(const Persistence_interval_range& intervals,
-                                           std::ostream& out = std::cout) {
-  for (auto interval : intervals) {
-    out << interval << "\n";
-  }
-}
-
-}  // namespace Gudhi
-
-#endif  // WRITING_PERSISTENCE_TO_FILE_H_