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osmium::index::map::FlexMem< TId, TValue > Class Template Reference

`#include <flex_mem.hpp>`

Inheritance diagram for osmium::index::map::FlexMem< TId, TValue >:
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Collaboration diagram for osmium::index::map::FlexMem< TId, TValue >:
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## Classes

struct | entry

## Public Member Functions

| FlexMem (bool use_dense=false)
bool | is_dense () const noexcept
std::size_t | size () const noexcept final
std::size_t | used_memory () const noexcept final
void | set (const TId id, const TValue value) final
| Set the field with id to value.
TValue | get_noexcept (const TId id) const noexcept final
TValue | get (const TId id) const final
void | clear () final
void | sort () final
void | switch_to_dense ()
std::pair< std::size_t, std::size_t > | stats () const noexcept
Public Member Functions inherited from osmium::index::map::Map< TId, TValue >
| Map () noexcept=default
| Map (const Map &)=delete
Map & | operator= (const Map &)=delete
virtual | ~Map () noexcept=default
virtual void | reserve (const std::size_t)
virtual void | dump_as_list (const int)
virtual void | dump_as_array (const int)

## Private Types

enum | { bits = 16 }
enum | : uint64_t { block_size = 1ULL << bits }
enum | : int64_t { min_dense_entries = 0xffffff }
enum | { density_factor = 3 }

## Private Member Functions

void | assure_block (const uint64_t num)
void | set_sparse (const uint64_t id, const TValue value)
TValue | get_sparse (const uint64_t id) const noexcept
void | set_dense (const uint64_t id, const TValue value)
TValue | get_dense (const uint64_t id) const noexcept

## Static Private Member Functions

static uint64_t | block (const uint64_t id) noexcept
static uint64_t | offset (const uint64_t id) noexcept

## Private Attributes

std::vector< entry > | m_sparse_entries
std::vector< std::vector< TValue > > | m_dense_blocks
uint64_t | m_max_id = 0
bool | m_dense

## Additional Inherited Members

Public Types inherited from osmium::index::map::Map< TId, TValue >
using | key_type = TId
| The "key" type, usually osmium::unsigned_object_id_type.
using | value_type = TValue
| The "value" type, usually a Location or size_t.
Protected Member Functions inherited from osmium::index::map::Map< TId, TValue >
| Map (Map &&) noexcept=default
Map & | operator= (Map &&) noexcept=default

## Detailed Description

template<typename TId, typename TValue>
class osmium::index::map::FlexMem< TId, TValue >

This is an autoscaling index that works well with small and large input data. All data will be held in memory. For small input data a sparse array will be used, if this becomes inefficient, the class will switch automatically to a dense index.

## Member Enumeration Documentation

## anonymous enum

template<typename TId, typename TValue>

anonymous enum : int64_t

private

Enumerator
min_dense_entries |

## anonymous enum

template<typename TId, typename TValue>

anonymous enum

private

Enumerator
density_factor |

## anonymous enum

template<typename TId, typename TValue>

anonymous enum : uint64_t

private

Enumerator
block_size |

## anonymous enum

template<typename TId, typename TValue>

anonymous enum

private

Enumerator
bits |

## Constructor & Destructor Documentation

## FlexMem()

template<typename TId, typename TValue>

osmium::index::map::FlexMem< TId, TValue >::FlexMem | ( | bool | use_dense = false | ) |

inlineexplicit

Create FlexMem index.

Parameters

  use_dense | Usually FlexMem indexes start out as sparse indexes and will switch to dense when they think it is better. Set this to force dense indexing from the start. This is usually only useful for testing.

## Member Function Documentation

## assure_block()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::assure_block | ( | const uint64_t | num | ) |

inlineprivate

## block()

template<typename TId, typename TValue>

uint64_t osmium::index::map::FlexMem< TId, TValue >::block | ( | const uint64_t | id | ) |

inlinestaticprivatenoexcept

## clear()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::clear | ( |  | ) |

inlinefinalvirtual

Clear memory used for this storage. After this you can not use the storage container any more.

Implements osmium::index::map::Map< TId, TValue >.

## get()

template<typename TId, typename TValue>

TValue osmium::index::map::FlexMem< TId, TValue >::get | ( | const TId | id | ) | const

inlinefinalvirtual

Retrieve value by id.

Parameters

  id | The id to look for.

Returns
  Value.

Exceptions

  osmium::not_found | if the id could not be found.

Implements osmium::index::map::Map< TId, TValue >.

## get_dense()

template<typename TId, typename TValue>

TValue osmium::index::map::FlexMem< TId, TValue >::get_dense | ( | const uint64_t | id | ) | const

inlineprivatenoexcept

## get_noexcept()

template<typename TId, typename TValue>

TValue osmium::index::map::FlexMem< TId, TValue >::get_noexcept | ( | const TId | id | ) | const

inlinefinalvirtualnoexcept

Retrieve value by id.

Parameters

  id | The id to look for.

Returns
  Value or, if not found, the empty value as defined by osmium::index::empty_value<TValue>() which is usually the default constructed value of type TValue.

Implements osmium::index::map::Map< TId, TValue >.

## get_sparse()

template<typename TId, typename TValue>

TValue osmium::index::map::FlexMem< TId, TValue >::get_sparse | ( | const uint64_t | id | ) | const

inlineprivatenoexcept

## is_dense()

template<typename TId, typename TValue>

bool osmium::index::map::FlexMem< TId, TValue >::is_dense | ( |  | ) | const

inlinenoexcept

## offset()

template<typename TId, typename TValue>

uint64_t osmium::index::map::FlexMem< TId, TValue >::offset | ( | const uint64_t | id | ) |

inlinestaticprivatenoexcept

## set()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::set | ( | const TId | id,
|  | const TValue | value )

inlinefinalvirtual

Set the field with id to value.

Implements osmium::index::map::Map< TId, TValue >.

## set_dense()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::set_dense | ( | const uint64_t | id,
|  | const TValue | value )

inlineprivate

## set_sparse()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::set_sparse | ( | const uint64_t | id,
|  | const TValue | value )

inlineprivate

## size()

template<typename TId, typename TValue>

std::size_t osmium::index::map::FlexMem< TId, TValue >::size | ( |  | ) | const

inlinefinalvirtualnoexcept

Get the approximate number of items in the storage. The storage might allocate memory in blocks, so this size might not be accurate. You can not use this to find out how much memory the storage uses. Use used_memory() for that.

Implements osmium::index::map::Map< TId, TValue >.

## sort()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::sort | ( |  | ) |

inlinefinalvirtual

Sort data in map. Call this after writing all data and before reading. Not all implementations need this.

Reimplemented from osmium::index::map::Map< TId, TValue >.

## stats()

template<typename TId, typename TValue>

std::pair< std::size_t, std::size_t > osmium::index::map::FlexMem< TId, TValue >::stats | ( |  | ) | const

inlinenoexcept

## switch_to_dense()

template<typename TId, typename TValue>

void osmium::index::map::FlexMem< TId, TValue >::switch_to_dense | ( |  | ) |

inline

Switch from using a sparse to a dense index. Usually you do not need to call this, because the FlexMem class will do this automatically if it thinks the dense index is more efficient.

Does nothing if the index is already in dense mode.

## used_memory()

template<typename TId, typename TValue>

std::size_t osmium::index::map::FlexMem< TId, TValue >::used_memory | ( |  | ) | const

inlinefinalvirtualnoexcept

Get the memory used for this storage in bytes. Note that this is not necessarily entirely accurate but an approximation. For storage classes that store the data in memory, this is the main memory used, for storage classes storing data on disk this is the memory used on disk.

Implements osmium::index::map::Map< TId, TValue >.

## Member Data Documentation

## m_dense

template<typename TId, typename TValue>

bool osmium::index::map::FlexMem< TId, TValue >::m_dense

private

## m_dense_blocks

template<typename TId, typename TValue>

std::vector<std::vector<TValue> > osmium::index::map::FlexMem< TId, TValue >::m_dense_blocks

private

## m_max_id

template<typename TId, typename TValue>

uint64_t osmium::index::map::FlexMem< TId, TValue >::m_max_id = 0

private

## m_sparse_entries

template<typename TId, typename TValue>

std::vector<entry> osmium::index::map::FlexMem< TId, TValue >::m_sparse_entries

private

The documentation for this class was generated from the following file:

- include/osmium/index/map/flex_mem.hpp