item_iterator.hpp
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#ifndef OSMIUM_ITEM_ITERATOR_HPP
#define OSMIUM_ITEM_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 <iosfwd>
#include <type_traits>
#include <osmium/fwd.hpp>
#include <osmium/memory/item.hpp>
#include <osmium/osm/item_type.hpp>
namespace osmium {
namespace memory {
namespace detail {
template <typename T>
inline bool type_is_compatible(osmium::item_type) noexcept {
return true;
}
template <>
inline bool type_is_compatible<osmium::Node>(osmium::item_type t) noexcept {
return t == osmium::item_type::node;
}
template <>
inline bool type_is_compatible<osmium::Way>(osmium::item_type t) noexcept {
return t == osmium::item_type::way;
}
template <>
inline bool type_is_compatible<osmium::Relation>(osmium::item_type t) noexcept {
return t == osmium::item_type::relation;
}
template <>
inline bool type_is_compatible<osmium::Area>(osmium::item_type t) noexcept {
return t == osmium::item_type::area;
}
template <>
inline bool type_is_compatible<osmium::Changeset>(osmium::item_type t) noexcept {
return t == osmium::item_type::changeset;
}
template <>
inline bool type_is_compatible<osmium::OSMObject>(osmium::item_type t) noexcept {
return t == osmium::item_type::node || t == osmium::item_type::way || t == osmium::item_type::relation || t == osmium::item_type::area;
}
template <>
inline bool type_is_compatible<osmium::OSMEntity>(osmium::item_type t) noexcept {
return t == osmium::item_type::node || t == osmium::item_type::way || t == osmium::item_type::relation || t == osmium::item_type::area || t == osmium::item_type::changeset;
}
template <>
inline bool type_is_compatible<osmium::TagList>(osmium::item_type t) noexcept {
return t == osmium::item_type::tag_list;
}
template <>
inline bool type_is_compatible<osmium::WayNodeList>(osmium::item_type t) noexcept {
return t == osmium::item_type::way_node_list;
}
template <>
inline bool type_is_compatible<osmium::RelationMemberList>(osmium::item_type t) noexcept {
return t == osmium::item_type::relation_member_list || t == osmium::item_type::relation_member_list_with_full_members;
}
template <>
inline bool type_is_compatible<osmium::OuterRing>(osmium::item_type t) noexcept {
return t == osmium::item_type::outer_ring;
}
template <>
inline bool type_is_compatible<osmium::InnerRing>(osmium::item_type t) noexcept {
return t == osmium::item_type::inner_ring;
}
} // namespace detail
template <typename TMember>
class ItemIterator : public std::iterator<std::forward_iterator_tag, TMember> {
// This data_type is either 'unsigned char*' or 'const unsigned char*' depending
// on whether TMember is const. This allows this class to be used as an iterator and
// as a const_iterator.
typedef typename std::conditional<std::is_const<TMember>::value, const unsigned char*, unsigned char*>::type data_type;
data_type m_data;
data_type m_end;
void advance_to_next_item_of_right_type() {
while (m_data != m_end &&
!detail::type_is_compatible<typename std::remove_const<TMember>::type>(reinterpret_cast<const osmium::memory::Item*>(m_data)->type())) {
m_data = reinterpret_cast<TMember*>(m_data)->next();
}
}
public:
ItemIterator() noexcept :
m_data(nullptr),
m_end(nullptr) {
}
ItemIterator(data_type data, data_type end) :
m_data(data),
m_end(end) {
advance_to_next_item_of_right_type();
}
template <typename T>
ItemIterator<T> cast() const {
return ItemIterator<T>(m_data, m_end);
}
ItemIterator<TMember>& operator++() {
assert(m_data);
assert(m_data != m_end);
m_data = reinterpret_cast<TMember*>(m_data)->next();
advance_to_next_item_of_right_type();
return *static_cast<ItemIterator<TMember>*>(this);
}
ItemIterator<TMember>& advance_once() {
assert(m_data);
assert(m_data != m_end);
m_data = reinterpret_cast<TMember*>(m_data)->next();
return *static_cast<ItemIterator<TMember>*>(this);
}
ItemIterator<TMember> operator++(int) {
ItemIterator<TMember> tmp(*this);
operator++();
return tmp;
}
bool operator==(const ItemIterator<TMember>& rhs) const {
return m_data == rhs.m_data && m_end == rhs.m_end;
}
bool operator!=(const ItemIterator<TMember>& rhs) const {
return !(*this == rhs);
}
unsigned char* data() const {
assert(m_data);
return m_data;
}
TMember& operator*() const {
assert(m_data);
assert(m_data != m_end);
return *reinterpret_cast<TMember*>(m_data);
}
TMember* operator->() const {
assert(m_data);
assert(m_data != m_end);
return reinterpret_cast<TMember*>(m_data);
}
explicit operator bool() const {
return (m_data != nullptr) && (m_data != m_end);
}
template <typename TChar, typename TTraits>
void print(std::basic_ostream<TChar, TTraits>& out) const {
out << static_cast<const void*>(m_data);
}
}; // class ItemIterator
template <typename TChar, typename TTraits, typename TMember>
inline std::basic_ostream<TChar, TTraits>& operator<<(std::basic_ostream<TChar, TTraits>& out, const ItemIterator<TMember>& iter) {
iter.print(out);
return out;
}
} // namespace memory
} // namespace osmium
#endif // OSMIUM_ITEM_ITERATOR_HPP
osmium::item_type::way
osmium::item_type::way_node_list
osmium::memory::ItemIterator::data_type
std::conditional< std::is_const< TMember >::value, const unsigned char *, unsigned char * >::type data_type
Definition: item_iterator.hpp:125
osmium::item_type::outer_ring
osmium::memory::ItemIterator::operator->
TMember * operator->() const
Definition: item_iterator.hpp:200
osmium::osm_entity_bits::type
type
Definition: entity_bits.hpp:60
osmium::item_type::tag_list
osmium::memory::ItemIterator::operator*
TMember & operator*() const
Definition: item_iterator.hpp:194
osmium::item_type::inner_ring
osmium::memory::ItemIterator
Definition: item_iterator.hpp:119
osmium::item_type::relation_member_list_with_full_members
osmium::item_type
item_type
Definition: item_type.hpp:43
fwd.hpp
osmium::item_type::area
osmium::memory::ItemIterator::advance_once
ItemIterator< TMember > & advance_once()
Definition: item_iterator.hpp:168
osmium::item_type::relation
item_type.hpp
osmium::memory::ItemIterator::operator==
bool operator==(const ItemIterator< TMember > &rhs) const
Definition: item_iterator.hpp:181
osmium::memory::ItemIterator::data
unsigned char * data() const
Definition: item_iterator.hpp:189
osmium::item_type::node
osmium::item_type::changeset
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:59
detail
Definition: attr.hpp:298
std::end
osmium::io::InputIterator< osmium::io::Reader > end(osmium::io::Reader &)
Definition: reader_iterator.hpp:45
osmium::memory::ItemIterator::advance_to_next_item_of_right_type
void advance_to_next_item_of_right_type()
Definition: item_iterator.hpp:130
osmium::memory::ItemIterator::ItemIterator
ItemIterator() noexcept
Definition: item_iterator.hpp:139
osmium::memory::ItemIterator::m_end
data_type m_end
Definition: item_iterator.hpp:128
osmium::memory::ItemIterator::m_data
data_type m_data
Definition: item_iterator.hpp:127
osmium::memory::ItemIterator::operator!=
bool operator!=(const ItemIterator< TMember > &rhs) const
Definition: item_iterator.hpp:185
osmium::memory::ItemIterator::operator++
ItemIterator< TMember > operator++(int)
Definition: item_iterator.hpp:175
item.hpp
osmium::memory::ItemIterator::cast
ItemIterator< T > cast() const
Definition: item_iterator.hpp:151
osmium::item_type::relation_member_list
osmium::memory::ItemIterator::ItemIterator
ItemIterator(data_type data, data_type end)
Definition: item_iterator.hpp:144
osmium::memory::ItemIterator::operator++
ItemIterator< TMember > & operator++()
Definition: item_iterator.hpp:155
osmium::memory::ItemIterator::print
void print(std::basic_ostream< TChar, TTraits > &out) const
Definition: item_iterator.hpp:211