Null_output_iterator.h

/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
 *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
 *    Author(s):       Marc Glisse
 *
 *    Copyright (C) 2017 Inria
 *
 *    Modification(s):
 *      - YYYY/MM Author: Description of the modification
 */
 
#ifndef NULL_OUTPUT_ITERATOR_H_
#define NULL_OUTPUT_ITERATOR_H_
 
#include <iterator>
 
namespace Gudhi {
 
struct Null_output_iterator {
  typedef std::output_iterator_tag iterator_category;
  typedef void                     value_type;
  typedef void                     difference_type;
  typedef void                     pointer;
  typedef void                     reference;
 
  Null_output_iterator& operator++() {return *this;}
  Null_output_iterator operator++(int) {return *this;}
  struct proxy {
    template<class T>
    proxy& operator=(T&&){return *this;}
  };
  proxy operator*()const{return {};}
};
}  // namespace Gudhi
 
#endif  // NULL_OUTPUT_ITERATOR_H_