diff_iterator.hpp
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#ifndef OSMIUM_DIFF_ITERATOR_HPP
#define OSMIUM_DIFF_ITERATOR_HPP
/*
This file is part of Osmium (http://osmcode.org/libosmium).
Copyright 2013-2016 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 <cassert>
#include <iterator>
#include <type_traits>
#include <osmium/osm/diff_object.hpp>
namespace osmium {
class OSMObject;
template <typename TBasicIterator>
class DiffIterator : public std::iterator<std::input_iterator_tag, const osmium::DiffObject> {
TBasicIterator m_prev;
TBasicIterator m_curr;
TBasicIterator m_next;
const TBasicIterator m_end;
mutable osmium::DiffObject m_diff;
void set_diff() const noexcept {
assert(m_curr != m_end);
bool use_curr_for_prev = m_prev->type() != m_curr->type() || m_prev->id() != m_curr->id();
bool use_curr_for_next = m_next == m_end || m_next->type() != m_curr->type() || m_next->id() != m_curr->id();
m_diff = std::move(osmium::DiffObject{
*(use_curr_for_prev ? m_curr : m_prev),
*m_curr,
*(use_curr_for_next ? m_curr : m_next)
});
}
public:
DiffIterator(TBasicIterator begin, TBasicIterator end) :
m_prev(begin),
m_curr(begin),
m_next(begin == end ? begin : ++begin),
m_end(std::move(end)),
m_diff() {
}
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::DiffObject
Definition: diff_object.hpp:63
osmium::make_diff_iterator
DiffIterator< TBasicIterator > make_diff_iterator(TBasicIterator begin, TBasicIterator end)
Definition: diff_iterator.hpp:127
osmium::DiffIterator::m_end
const TBasicIterator m_end
Definition: diff_iterator.hpp:59
std
Definition: reader_iterator.hpp:39
osmium::DiffIterator
Definition: diff_iterator.hpp:52
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:59
osmium::DiffIterator::m_diff
osmium::DiffObject m_diff
Definition: diff_iterator.hpp:61
std::end
osmium::io::InputIterator< osmium::io::Reader > end(osmium::io::Reader &)
Definition: reader_iterator.hpp:45
osmium::DiffIterator::operator==
bool operator==(const DiffIterator &rhs) const noexcept
Definition: diff_iterator.hpp:103
osmium::DiffIterator::set_diff
void set_diff() const noexcept
Definition: diff_iterator.hpp:63
osmium::DiffIterator::operator++
DiffIterator & operator++()
Definition: diff_iterator.hpp:86
osmium::DiffIterator::m_prev
TBasicIterator m_prev
Definition: diff_iterator.hpp:55
osmium::DiffIterator::operator*
reference operator*() const noexcept
Definition: diff_iterator.hpp:111
osmium::DiffIterator::operator++
DiffIterator operator++(int)
Definition: diff_iterator.hpp:97
osmium::DiffIterator::m_curr
TBasicIterator m_curr
Definition: diff_iterator.hpp:56
osmium::DiffIterator::operator->
pointer operator->() const noexcept
Definition: diff_iterator.hpp:116
osmium::DiffIterator::m_next
TBasicIterator m_next
Definition: diff_iterator.hpp:57
diff_object.hpp
std::begin
osmium::io::InputIterator< osmium::io::Reader > begin(osmium::io::Reader &reader)
Definition: reader_iterator.hpp:41
osmium::DiffIterator::operator!=
bool operator!=(const DiffIterator &rhs) const noexcept
Definition: diff_iterator.hpp:107
osmium::DiffIterator::DiffIterator
DiffIterator(TBasicIterator begin, TBasicIterator end)
Definition: diff_iterator.hpp:78