iterator.hh

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/*
 * libkeepass - KeePass key database importer/exporter
 * Copyright (C) 2014 Christian Kindahl
 * Copyright (C) 2024 Dominik Krümpelmann
 *
 * 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/>.
 */
 
#pragma once
#include <exception>
#include <iterator>
 
namespace keepass {
 
template <typename C> class bounds_checked_iterator {
protected:
  typename C::iterator first_;
  typename C::iterator last_;
 
public:
  using iterator_category = std::output_iterator_tag;
  using value_type = void;
  using difference_type = void;
  using pointer = void;
  using reference = void;
 
  explicit bounds_checked_iterator(C& container)
      : first_(container.begin()), last_(container.end()) {}
 
  bounds_checked_iterator& operator=(const typename C::value_type& value) {
    if (first_ == last_)
      throw std::out_of_range("assigning outside container limits.");
 
    *first_ = value;
    return *this;
  }
 
  bounds_checked_iterator& operator=(typename C::value_type&& value) {
    if (first_ == last_)
      throw std::out_of_range("assigning outside container limits.");
 
    *first_ = std::move(value);
    return *this;
  }
 
  bounds_checked_iterator& operator*() { return *this; }
 
  bounds_checked_iterator& operator++() {
    first_++;
    return *this;
  }
 
  bounds_checked_iterator operator++(int) {
    ++first_;
    return *this;
  }
};
 
template <typename C> inline bounds_checked_iterator<C> bounds_checked(C& container) {
  return bounds_checked_iterator<C>(container);
}
 
} // namespace keepass