releasing_iterator.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration.
 */
 
 
#ifndef CXXUTILS_RELEASING_ITERATOR_H
#define CXXUTILS_RELEASING_ITERATOR_H
 
 
#include <iterator>
 
 
namespace CxxUtils {
 

template <class ITERATOR>
class releasing_iterator
{
public:
  using value_type = typename std::iterator_traits<ITERATOR>::value_type::pointer;
  using reference = value_type&;
  using pointer = value_type*;
  using difference_type = typename std::iterator_traits<ITERATOR>::difference_type;
  using iterator_category = std::input_iterator_tag;
 
  releasing_iterator (ITERATOR it) : m_it (it) {}
  value_type operator*() { return m_it->release(); }
  releasing_iterator& operator++() { ++m_it; return *this; }
  bool operator!= (const releasing_iterator& other) const { return m_it != other.m_it; }
 
 
private:
  ITERATOR m_it;
};
 
 
} // namespace CxxUtils
 
 
#endif // not CXXUTILS_RELEASING_ITERATOR_H