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input_iterator.hpp
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#ifndef OSMIUM_IO_INPUT_ITERATOR_HPP
#define OSMIUM_IO_INPUT_ITERATOR_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2023 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/memory/buffer.hpp>
#include <osmium/memory/item.hpp>
#include <cassert>
#include <cstddef>
#include <iterator>
#include <memory>
#include <type_traits>
namespace osmium {
namespace io {
template <typename TSource, typename TItem = osmium::memory::Item>
class InputIterator {
using item_iterator = typename osmium::memory::Buffer::t_iterator<TItem>;
TSource* m_source;
std::shared_ptr<osmium::memory::Buffer> m_buffer;
item_iterator m_iter{};
void update_buffer() {
do {
m_buffer = std::make_shared<osmium::memory::Buffer>(std::move(m_source->read()));
if (!m_buffer || !*m_buffer) { // end of input
m_source = nullptr;
m_buffer.reset();
m_iter = item_iterator{};
return;
}
m_iter = m_buffer->select<TItem>().begin();
} while (m_iter == m_buffer->select<TItem>().end());
}
public:
using iterator_category = std::input_iterator_tag;
using value_type = TItem;
using difference_type = ptrdiff_t;
using pointer = value_type*;
using reference = value_type&;
explicit InputIterator(TSource& source) :
m_source(&source) {
update_buffer();
}
// end iterator
InputIterator() noexcept :
m_source(nullptr) {
}
InputIterator& operator++() {
assert(m_source);
assert(m_buffer);
assert(m_iter);
++m_iter;
if (m_iter == m_buffer->select<TItem>().end()) {
update_buffer();
}
return *this;
}
InputIterator operator++(int) {
InputIterator tmp{*this};
operator++();
return tmp;
}
bool operator==(const InputIterator& rhs) const noexcept {
return m_source == rhs.m_source &&
m_buffer == rhs.m_buffer &&
m_iter == rhs.m_iter;
}
bool operator!=(const InputIterator& rhs) const noexcept {
return !(*this == rhs);
}
reference operator*() const {
assert(m_iter);
return static_cast<reference>(*m_iter);
}
pointer operator->() const {
assert(m_iter);
return &static_cast<reference>(*m_iter);
}
}; // class InputIterator
template <typename TSource, typename TItem = osmium::memory::Item>
class InputIteratorRange {
InputIterator<TSource, TItem> m_begin;
InputIterator<TSource, TItem> m_end;
public:
InputIteratorRange(InputIterator<TSource, TItem>&& begin,
InputIterator<TSource, TItem>&& end) :
m_begin(std::move(begin)),
m_end(std::move(end)) {
}
InputIterator<TSource, TItem> begin() const noexcept {
return m_begin;
}
InputIterator<TSource, TItem> end() const noexcept {
return m_end;
}
InputIterator<TSource, TItem> cbegin() const noexcept {
return m_begin;
}
InputIterator<TSource, TItem> cend() const noexcept {
return m_end;
}
}; // class InputIteratorRange
template <typename TItem, typename TSource>
InputIteratorRange<TSource, TItem> make_input_iterator_range(TSource& source) {
using it_type = InputIterator<TSource, TItem>;
return InputIteratorRange<TSource, TItem>{it_type{source}, it_type{}};
}
} // namespace io
} // namespace osmium
#endif // OSMIUM_IO_INPUT_ITERATOR_HPP
buffer.hpp
osmium::io::InputIteratorRange
Definition input_iterator.hpp:135
osmium::io::InputIteratorRange::InputIteratorRange
InputIteratorRange(InputIterator< TSource, TItem > &&begin, InputIterator< TSource, TItem > &&end)
Definition input_iterator.hpp:142
osmium::io::InputIteratorRange::m_end
InputIterator< TSource, TItem > m_end
Definition input_iterator.hpp:138
osmium::io::InputIteratorRange::cbegin
InputIterator< TSource, TItem > cbegin() const noexcept
Definition input_iterator.hpp:156
osmium::io::InputIteratorRange::cend
InputIterator< TSource, TItem > cend() const noexcept
Definition input_iterator.hpp:160
osmium::io::InputIteratorRange::m_begin
InputIterator< TSource, TItem > m_begin
Definition input_iterator.hpp:137
osmium::io::InputIteratorRange::end
InputIterator< TSource, TItem > end() const noexcept
Definition input_iterator.hpp:152
osmium::io::InputIteratorRange::begin
InputIterator< TSource, TItem > begin() const noexcept
Definition input_iterator.hpp:148
osmium::io::InputIterator
Definition input_iterator.hpp:55
osmium::io::InputIterator::m_iter
item_iterator m_iter
Definition input_iterator.hpp:62
osmium::io::InputIterator::difference_type
ptrdiff_t difference_type
Definition input_iterator.hpp:81
osmium::io::InputIterator::item_iterator
typename osmium::memory::Buffer::t_iterator< TItem > item_iterator
Definition input_iterator.hpp:58
osmium::io::InputIterator::operator!=
bool operator!=(const InputIterator &rhs) const noexcept
Definition input_iterator.hpp:118
osmium::io::InputIterator::pointer
value_type * pointer
Definition input_iterator.hpp:82
osmium::io::InputIterator::InputIterator
InputIterator() noexcept
Definition input_iterator.hpp:91
osmium::io::InputIterator::reference
value_type & reference
Definition input_iterator.hpp:83
osmium::io::InputIterator::operator*
reference operator*() const
Definition input_iterator.hpp:122
osmium::io::InputIterator::operator==
bool operator==(const InputIterator &rhs) const noexcept
Definition input_iterator.hpp:112
osmium::io::InputIterator::update_buffer
void update_buffer()
Definition input_iterator.hpp:64
osmium::io::InputIterator::InputIterator
InputIterator(TSource &source)
Definition input_iterator.hpp:85
osmium::io::InputIterator::m_buffer
std::shared_ptr< osmium::memory::Buffer > m_buffer
Definition input_iterator.hpp:61
osmium::io::InputIterator::operator->
pointer operator->() const
Definition input_iterator.hpp:127
osmium::io::InputIterator::operator++
InputIterator & operator++()
Definition input_iterator.hpp:95
osmium::io::InputIterator::iterator_category
std::input_iterator_tag iterator_category
Definition input_iterator.hpp:79
osmium::io::InputIterator::operator++
InputIterator operator++(int)
Definition input_iterator.hpp:106
osmium::io::InputIterator::m_source
TSource * m_source
Definition input_iterator.hpp:60
osmium::io::InputIterator::value_type
TItem value_type
Definition input_iterator.hpp:80
item.hpp
osmium::io::begin
InputIterator< Reader > begin(Reader &reader)
Definition reader_iterator.hpp:43
osmium::io::make_input_iterator_range
InputIteratorRange< TSource, TItem > make_input_iterator_range(TSource &source)
Definition input_iterator.hpp:167
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
std
Definition location.hpp:555