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sparse_mem_multimap.hpp
Go to the documentation of this file.
#ifndef OSMIUM_INDEX_MULTIMAP_SPARSE_MEM_MULTIMAP_HPP
#define OSMIUM_INDEX_MULTIMAP_SPARSE_MEM_MULTIMAP_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/multimap.hpp>
#include <osmium/io/detail/read_write.hpp>
#include <algorithm>
#include <cstddef>
#include <map>
#include <utility>
#include <vector>
namespace osmium {
namespace index {
namespace multimap {
template <typename TId, typename TValue>
class SparseMemMultimap final : public osmium::index::multimap::Multimap<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)
};
public:
using collection_type = typename std::multimap<const TId, TValue>;
using iterator = typename collection_type::iterator;
using const_iterator = typename collection_type::const_iterator;
using value_type = typename collection_type::value_type;
using element_type = typename std::pair<TId, TValue>;
private:
collection_type m_elements;
public:
SparseMemMultimap() = default;
~SparseMemMultimap() noexcept = default;
void unsorted_set(const TId id, const TValue value) {
m_elements.emplace(id, value);
}
void set(const TId id, const TValue value) override {
m_elements.emplace(id, value);
}
std::pair<iterator, iterator> get_all(const TId id) {
return m_elements.equal_range(id);
}
std::pair<const_iterator, const_iterator> get_all(const TId id) const {
return m_elements.equal_range(id);
}
void remove(const TId id, const TValue value) {
std::pair<iterator, iterator> r = get_all(id);
for (iterator it = r.first; it != r.second; ++it) {
if (it->second == value) {
m_elements.erase(it);
return;
}
}
}
iterator begin() {
return m_elements.begin();
}
iterator end() {
return m_elements.end();
}
size_t size() const override {
return m_elements.size();
}
size_t used_memory() const override {
return element_size * m_elements.size();
}
void clear() override {
m_elements.clear();
}
void consolidate() {
// intentionally left blank
}
void dump_as_list(const int fd) override {
std::vector<element_type> v;
v.reserve(m_elements.size());
for (const auto& element : m_elements) {
v.emplace_back(element.first, element.second);
}
std::sort(v.begin(), v.end());
osmium::io::detail::reliable_write(fd, reinterpret_cast<const char*>(v.data()), sizeof(element_type) * v.size());
}
}; // class SparseMemMultimap
} // namespace multimap
} // namespace index
} // namespace osmium
#endif // OSMIUM_INDEX_MULTIMAP_SPARSE_MEM_MULTIMAP_HPP
osmium::index::multimap::Multimap
Definition multimap.hpp:51
osmium::index::multimap::SparseMemMultimap::element_type
typename std::pair< TId, TValue > element_type
Definition sparse_mem_multimap.hpp:72
osmium::index::multimap::SparseMemMultimap::element_size
@ element_size
Definition sparse_mem_multimap.hpp:63
osmium::index::multimap::SparseMemMultimap::used_memory
size_t used_memory() const override
Definition sparse_mem_multimap.hpp:122
osmium::index::multimap::SparseMemMultimap::end
iterator end()
Definition sparse_mem_multimap.hpp:114
osmium::index::multimap::SparseMemMultimap::const_iterator
typename collection_type::const_iterator const_iterator
Definition sparse_mem_multimap.hpp:70
osmium::index::multimap::SparseMemMultimap::SparseMemMultimap
SparseMemMultimap()=default
osmium::index::multimap::SparseMemMultimap::collection_type
typename std::multimap< const TId, TValue > collection_type
Definition sparse_mem_multimap.hpp:68
osmium::index::multimap::SparseMemMultimap::consolidate
void consolidate()
Definition sparse_mem_multimap.hpp:130
osmium::index::multimap::SparseMemMultimap::remove
void remove(const TId id, const TValue value)
Definition sparse_mem_multimap.hpp:100
osmium::index::multimap::SparseMemMultimap::size
size_t size() const override
Definition sparse_mem_multimap.hpp:118
osmium::index::multimap::SparseMemMultimap::m_elements
collection_type m_elements
Definition sparse_mem_multimap.hpp:76
osmium::index::multimap::SparseMemMultimap::dump_as_list
void dump_as_list(const int fd) override
Definition sparse_mem_multimap.hpp:134
osmium::index::multimap::SparseMemMultimap::begin
iterator begin()
Definition sparse_mem_multimap.hpp:110
osmium::index::multimap::SparseMemMultimap::value_type
typename collection_type::value_type value_type
Definition sparse_mem_multimap.hpp:71
osmium::index::multimap::SparseMemMultimap::iterator
typename collection_type::iterator iterator
Definition sparse_mem_multimap.hpp:69
osmium::index::multimap::SparseMemMultimap::set
void set(const TId id, const TValue value) override
Set the field with id to value.
Definition sparse_mem_multimap.hpp:88
osmium::index::multimap::SparseMemMultimap::unsorted_set
void unsorted_set(const TId id, const TValue value)
Definition sparse_mem_multimap.hpp:84
osmium::index::multimap::SparseMemMultimap::get_all
std::pair< iterator, iterator > get_all(const TId id)
Definition sparse_mem_multimap.hpp:92
osmium::index::multimap::SparseMemMultimap::get_all
std::pair< const_iterator, const_iterator > get_all(const TId id) const
Definition sparse_mem_multimap.hpp:96
osmium::index::multimap::SparseMemMultimap::~SparseMemMultimap
~SparseMemMultimap() noexcept=default
osmium::index::multimap::SparseMemMultimap::clear
void clear() override
Definition sparse_mem_multimap.hpp:126
multimap.hpp
osmium::index::multimap
Key-value containers with multiple values for an integer key.
Definition multimap.hpp:48
osmium::index
Indexing of OSM data, Locations, etc.
Definition id_set.hpp:51
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53