/usr/include/osmium/io/input_iterator.hpp is in libosmium2-dev 2.11.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | #ifndef OSMIUM_IO_INPUT_ITERATOR_HPP
#define OSMIUM_IO_INPUT_ITERATOR_HPP
/*
This file is part of Osmium (http://osmcode.org/libosmium).
Copyright 2013-2017 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 <cstddef>
#include <iterator>
#include <memory>
#include <type_traits>
#include <osmium/memory/buffer.hpp>
#include <osmium/memory/item.hpp>
namespace osmium {
namespace io {
/**
* This iterator class allows you to iterate over all items from a
* source. It hides all the buffer handling and makes the contents of a
* source accessible as a normal STL input iterator.
*/
template <typename TSource, typename TItem = osmium::memory::Item>
class InputIterator {
static_assert(std::is_base_of<osmium::memory::Item, TItem>::value, "TItem must derive from osmium::buffer::Item");
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;
}
const InputIterator<TSource, TItem> cbegin() const noexcept {
return m_begin;
}
const 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
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