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diff_iterator.hpp
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#ifndef OSMIUM_DIFF_ITERATOR_HPP
#define OSMIUM_DIFF_ITERATOR_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <osmium/osm/diff_object.hpp>
#include <cassert>
#include <cstddef>
#include <iterator>
#include <type_traits>
#include <utility>
namespace osmium {
class OSMObject;
template <typename TBasicIterator>
class DiffIterator {
TBasicIterator m_prev;
TBasicIterator m_curr;
TBasicIterator m_next;
TBasicIterator m_end;
mutable osmium::DiffObject m_diff;
void set_diff() const noexcept {
assert(m_curr != m_end);
const bool use_curr_for_prev = m_prev->type() != m_curr->type() || m_prev->id() != m_curr->id();
const bool use_curr_for_next = m_next == m_end || m_next->type() != m_curr->type() || m_next->id() != m_curr->id();
m_diff = osmium::DiffObject{
*(use_curr_for_prev ? m_curr : m_prev),
*m_curr,
*(use_curr_for_next ? m_curr : m_next)
};
}
public:
using iterator_category = std::input_iterator_tag;
using value_type = const osmium::DiffObject;
using difference_type = std::ptrdiff_t;
using pointer = value_type*;
using reference = value_type&;
DiffIterator(TBasicIterator begin, TBasicIterator end) :
m_prev(begin),
m_curr(begin),
m_next(begin == end ? begin : ++begin),
m_end(std::move(end)) {
}
DiffIterator& operator++() {
m_prev = std::move(m_curr);
m_curr = m_next;
if (m_next != m_end) {
++m_next;
}
return *this;
}
DiffIterator operator++(int) {
DiffIterator tmp{*this};
operator++();
return tmp;
}
bool operator==(const DiffIterator& rhs) const noexcept {
return m_curr == rhs.m_curr && m_end == rhs.m_end;
}
bool operator!=(const DiffIterator& rhs) const noexcept {
return !(*this == rhs);
}
reference operator*() const noexcept {
set_diff();
return m_diff;
}
pointer operator->() const noexcept {
set_diff();
return &m_diff;
}
}; // class DiffIterator
template <typename TBasicIterator>
inline DiffIterator<TBasicIterator> make_diff_iterator(TBasicIterator begin,
TBasicIterator end) {
return DiffIterator<TBasicIterator>{begin, end};
}
} // namespace osmium
#endif // OSMIUM_DIFF_ITERATOR_HPP
osmium::DiffIterator
Definition diff_iterator.hpp:57
osmium::DiffIterator::operator*
reference operator*() const noexcept
Definition diff_iterator.hpp:121
osmium::DiffIterator::difference_type
std::ptrdiff_t difference_type
Definition diff_iterator.hpp:85
osmium::DiffIterator::m_diff
osmium::DiffObject m_diff
Definition diff_iterator.hpp:66
osmium::DiffIterator::m_end
TBasicIterator m_end
Definition diff_iterator.hpp:64
osmium::DiffIterator::m_curr
TBasicIterator m_curr
Definition diff_iterator.hpp:61
osmium::DiffIterator::operator==
bool operator==(const DiffIterator &rhs) const noexcept
Definition diff_iterator.hpp:113
osmium::DiffIterator::DiffIterator
DiffIterator(TBasicIterator begin, TBasicIterator end)
Definition diff_iterator.hpp:89
osmium::DiffIterator::operator++
DiffIterator & operator++()
Definition diff_iterator.hpp:96
osmium::DiffIterator::set_diff
void set_diff() const noexcept
Definition diff_iterator.hpp:68
osmium::DiffIterator::operator!=
bool operator!=(const DiffIterator &rhs) const noexcept
Definition diff_iterator.hpp:117
osmium::DiffIterator::m_prev
TBasicIterator m_prev
Definition diff_iterator.hpp:60
osmium::DiffIterator::operator++
DiffIterator operator++(int)
Definition diff_iterator.hpp:107
osmium::DiffIterator::pointer
value_type * pointer
Definition diff_iterator.hpp:86
osmium::DiffIterator::operator->
pointer operator->() const noexcept
Definition diff_iterator.hpp:126
osmium::DiffIterator::reference
value_type & reference
Definition diff_iterator.hpp:87
osmium::DiffIterator::iterator_category
std::input_iterator_tag iterator_category
Definition diff_iterator.hpp:83
osmium::DiffIterator::value_type
const osmium::DiffObject value_type
Definition diff_iterator.hpp:84
osmium::DiffIterator::m_next
TBasicIterator m_next
Definition diff_iterator.hpp:62
osmium::DiffObject
Definition diff_object.hpp:66
osmium::OSMObject
Definition object.hpp:64
diff_object.hpp
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::make_diff_iterator
DiffIterator< TBasicIterator > make_diff_iterator(TBasicIterator begin, TBasicIterator end)
Definition diff_iterator.hpp:137
std
Definition location.hpp:654