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sparse_mem_map.hpp
Go to the documentation of this file.
#ifndef OSMIUM_INDEX_MAP_SPARSE_MEM_MAP_HPP
#define OSMIUM_INDEX_MAP_SPARSE_MEM_MAP_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2025 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/index/index.hpp>
#include <osmium/index/map.hpp>
#include <osmium/io/detail/read_write.hpp>
#include <algorithm> // IWYU pragma: keep (for std::copy)
#include <cstddef>
#include <iterator>
#include <map>
#include <vector>
#define OSMIUM_HAS_INDEX_MAP_SPARSE_MEM_MAP
namespace osmium {
namespace index {
namespace map {
template <typename TId, typename TValue>
class SparseMemMap : public osmium::index::map::Map<TId, TValue> {
// This is a rough estimate for the memory needed for each
// element in the map (id + value + pointers to left, right,
// and parent plus some overhead for color of red-black-tree
// or similar).
enum {
element_size = sizeof(TId) + sizeof(TValue) + (sizeof(void*) * 4U)
};
std::map<TId, TValue> m_elements;
public:
SparseMemMap() = default;
void set(const TId id, const TValue value) final {
m_elements[id] = value;
}
TValue get(const TId id) const final {
const auto it = m_elements.find(id);
if (it == m_elements.end()) {
throw osmium::not_found{id};
}
return it->second;
}
TValue get_noexcept(const TId id) const noexcept final {
const auto it = m_elements.find(id);
if (it == m_elements.end()) {
return osmium::index::empty_value<TValue>();
}
return it->second;
}
size_t size() const noexcept final {
return m_elements.size();
}
size_t used_memory() const noexcept final {
return element_size * m_elements.size();
}
void clear() final {
m_elements.clear();
}
void dump_as_list(const int fd) final {
using t = typename std::map<TId, TValue>::value_type;
std::vector<t> v;
v.reserve(m_elements.size());
std::copy(m_elements.cbegin(), m_elements.cend(), std::back_inserter(v));
osmium::io::detail::reliable_write(fd, reinterpret_cast<const char*>(v.data()), sizeof(t) * v.size());
}
}; // class SparseMemMap
} // namespace map
} // namespace index
} // namespace osmium
#ifdef OSMIUM_WANT_NODE_LOCATION_MAPS
REGISTER_MAP(osmium::unsigned_object_id_type, osmium::Location, osmium::index::map::SparseMemMap, sparse_mem_map)
#endif
#endif // OSMIUM_INDEX_MAP_SPARSE_MEM_MAP_HPP
osmium::Location
Definition location.hpp:271
osmium::index::map::Map
Definition map.hpp:97
osmium::index::map::SparseMemMap
Definition sparse_mem_map.hpp:59
osmium::index::map::SparseMemMap::element_size
@ element_size
Definition sparse_mem_map.hpp:66
osmium::index::map::SparseMemMap::get
TValue get(const TId id) const final
Definition sparse_mem_map.hpp:79
osmium::index::map::SparseMemMap::used_memory
size_t used_memory() const noexcept final
Definition sparse_mem_map.hpp:99
osmium::index::map::SparseMemMap::SparseMemMap
SparseMemMap()=default
osmium::index::map::SparseMemMap::get_noexcept
TValue get_noexcept(const TId id) const noexcept final
Definition sparse_mem_map.hpp:87
osmium::index::map::SparseMemMap::dump_as_list
void dump_as_list(const int fd) final
Definition sparse_mem_map.hpp:107
osmium::index::map::SparseMemMap::set
void set(const TId id, const TValue value) final
Set the field with id to value.
Definition sparse_mem_map.hpp:75
osmium::index::map::SparseMemMap::clear
void clear() final
Definition sparse_mem_map.hpp:103
osmium::index::map::SparseMemMap::size
size_t size() const noexcept final
Definition sparse_mem_map.hpp:95
osmium::index::map::SparseMemMap::m_elements
std::map< TId, TValue > m_elements
Definition sparse_mem_map.hpp:69
index.hpp
map.hpp
REGISTER_MAP
#define REGISTER_MAP(id, value, klass, name)
Definition map.hpp:287
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::unsigned_object_id_type
uint64_t unsigned_object_id_type
Type for OSM object (node, way, or relation) IDs where we only allow positive IDs.
Definition types.hpp:46
osmium::not_found
Definition index.hpp:50