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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 FILE_WRITER_
#define FILE_WRITER_
#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:
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() ){}
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()){}
Persistence_interval_common( Filtration_type birth , Filtration_type death,
unsigned dim , Coefficient_field field ):
birth_(birth),death_(death),dimension_(dim),
arith_element_(field){}
inline bool operator == ( const Persistence_interval_common &i2)
{
return (
(this->birth_ == i2.birth_) && (this->death_ == i2.death_) &&
(this->dimension_ == i2.dimension_) && (this->arith_element_ == i2.arith_element_)
);
}
inline bool operator != ( const Persistence_interval_common &i2)
{
return (!((*this)==i2));
}
/**
* Note that this operator do not take Arith_element into account when doing comparisions.
**/
inline bool operator < ( const Persistence_interval_common &i2)
{
if ( this->birth_ < i2.birth_ )
{
return true;
}
else
{
if ( this->birth_ > i2.birth_ )
{
return false;
}
else
{
//in this case this->birth_ == i2.birth_
if ( this->death_ > i2.death_ )
{
return true;
}
else
{
if ( this->death_ < i2.death_ )
{
return false;
}
else
{
//in this case this->death_ == i2.death_
if ( this->dimension_ < i2.dimension_ )
{
return true;
}
else
{
//in this case this->dimension >= i2.dimension
return false;
}
}
}
}
}
}
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_;
};//Persistence_interval_common
/**
* This function write a vector<Persistence_interval_common> to a stream
**/
template <typename Filtration_type , typename Coefficient_field>
void write_persistence_intervals_to_stream(
//const std::vector< Persistence_interval_common<Filtration_type,Coefficient_field> >& intervals,
std::ostream& out = std::cout )
{
for ( auto interval : intervals )
{
out << interval << "\n";
}
}//write_persistence_intervals_to_stream
}
#endif //FILE_WRITER_
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