ContiguousRangeMap< K, V, MAP > Class Template Reference

#include <contiguousrangemap.h>

Detailed Description

template<typename K, typename V, typename MAP = BurstTrieMapSelector<>>
class maxon::ContiguousRangeMap< K, V, MAP >

Unlike a normal map, a RangeMap maps whole ranges (of integral values) to values. For each contiguous range having the same value, only a single entry is needed, so a RangeMap will perform much better than a normal map if it is likely that consecutive keys are mapped to the same value.

RangeMap<UInt, String> map;
if (!map.Insert(Range<UInt>(10, 40), "Alice"_s))
  return false;
if (!map.Insert(Range<UInt>(30, 50), "Carol"_s))
  return false;
if (!map.Erase(Range<UInt>(15, 25)))
  return false;

The above example results in a map with three entries: The range 10 ... 14 is mapped to "Alice" as well as the range 26 ... 29, while the range 30 ... 50 is mapped to "Carol".

RangeMap ensures that its ranges don't overlap, and that directly adjacent ranges (with no gap between them) which are mapped to the same value are merged to a single range.

RangeMap supports the usual iterators. They iterate through the map per range.

Template Parameters

K	Type of keys. This must be an integral type.
V	Type of values.
MAP	A map selector template to choose the underlying map implementation to use. This has to be an ordered map. Note that the default is the BurstTrieMap which only allows unsigned integral types.

Classes
class	EntryIteratorBase
class	KeyIteratorBase
class	ValueIteratorBase

Public Types
using	MapType = typename MAP::template Type< K, V >
using	Range = maxon::Range< K >
using	ValueType = typename MapType::ValueType
using	MapValue = typename MapType::ValueType
using	ConstIterator = typename MapType::template IteratorTemplate< true, EntryIteratorBase >
using	Iterator = ConstIterator
using	ConstKeyIterator = typename MapType::template IteratorTemplate< true, KeyIteratorBase >
using	ConstValueIterator = typename MapType::template IteratorTemplate< true, ValueIteratorBase >

Public Member Functions
	ContiguousRangeMap ()
	ContiguousRangeMap (ContiguousRangeMap &&src)
	MAXON_OPERATOR_MOVE_ASSIGNMENT (ContiguousRangeMap)
Result< void >	Init (const V &value)
Result< void >	Init (V &&value)
Result< void >	CopyFrom (const ContiguousRangeMap &src)
Int	GetMemorySize () const
Result< void >	Insert (K rMinValue, K rMaxValue, V &&value)
Result< void >	Insert (K rMinValue, K rMaxValue, const V &value)
Result< void >	Insert (K key, const V &value)
Result< void >	Insert (const Range &range, const V &value)
const V *	FindValue (K key) const
const V *	FindRange (K key, Range &rangeOut) const
SFINAEHelper< String, K >::type	ToString (const FormatStatement *fmt=nullptr) const
ConstIterator	Begin () const
ConstIterator	End () const
ConstKeyIterator	GetKeys () const
ConstValueIterator	GetValues () const
const MapType &	GetMap () const
HashInt	GetHashCode () const
Bool	operator== (const ContiguousRangeMap &other) const
Bool	operator!= (const ContiguousRangeMap &other) const
const MapType &	GetUnderlyingMap () const
MapType &	GetUnderlyingMap ()

Private Member Functions
	MAXON_DISALLOW_COPY_AND_ASSIGN (ContiguousRangeMap)

Private Attributes
MapType	_map

Member Typedef Documentation

MapType

using MapType = typename MAP::template Type<K, V>

Range

using Range = maxon::Range<K>

ValueType

using ValueType = typename MapType::ValueType

MapValue

using MapValue = typename MapType::ValueType

ConstIterator

using ConstIterator = typename MapType::template IteratorTemplate<true, EntryIteratorBase>

Iterator

using Iterator = ConstIterator

ConstKeyIterator

using ConstKeyIterator = typename MapType::template IteratorTemplate<true, KeyIteratorBase>

ConstValueIterator

using ConstValueIterator = typename MapType::template IteratorTemplate<true, ValueIteratorBase>

Constructor & Destructor Documentation

ContiguousRangeMap() [1/2]

ContiguousRangeMap

(

)

ContiguousRangeMap() [2/2]

ContiguousRangeMap

(

ContiguousRangeMap< K, V, MAP > &&

src

)

Member Function Documentation

MAXON_OPERATOR_MOVE_ASSIGNMENT()

MAXON_OPERATOR_MOVE_ASSIGNMENT

(

ContiguousRangeMap< K, V, MAP >

)

Init() [1/2]

Result<void> Init

(

const V &

value

)

Initializes the map. This has to be done before any of the other functions of this map are called.

Init() [2/2]

Result<void> Init

(

V &&

value

)

Initializes the map. This has to be done before any of the other functions of this map are called.

CopyFrom()

Result<void> CopyFrom

(

const ContiguousRangeMap< K, V, MAP > &

src

)

Makes this map a copy of src.

Parameters

[in]

src

Source from which the entries are taken.

Returns

True if copying succeeded.

GetMemorySize()

Int GetMemorySize

(

)

const

Calculates the memory usage for this map. Keys and Values must have a public member GetMemorySize that return the element size.

Returns

Memory size in bytes.

Insert() [1/4]

Result<void> Insert	(	K	rMinValue,
		K	rMaxValue,
		V &&	value
	)

Maps the range rMinValue ... rMaxValue to value. Existing overlapping mappings are truncated, split or removed as necessary, or they are merged with the new mapping if their values are equal. If the range is empty (rMaxValue is less than rMinValue), nothing happens.

Parameters

[in]	rMinValue	Lower boundary of the range.
[in]	rMaxValue	Upper boundary of the range.
[in]	value	Value to which the range shall be mapped.

Insert() [2/4]

Result<void> Insert	(	K	rMinValue,
		K	rMaxValue,
		const V &	value
	)

Maps the range rMinValue ... rMaxValue to value. Existing overlapping mappings are truncated, split or removed as necessary, or they are merged with the new mapping if their values are equal. If the range is empty (rMaxValue is less than rMinValue), nothing happens.

Parameters

[in]	rMinValue	Lower boundary of the range.
[in]	rMaxValue	Upper boundary of the range.
[in]	value	Value to which the range shall be mapped.

Insert() [3/4]

Result<void> Insert	(	K	key,
		const V &	value
	)

Maps the single value key (i.e., the range key ... key consisting of a single element) to value. Existing mappings which overlap key are truncated, split or removed as necessary, or they may be extended to include key if their values are equal.

Parameters

[in]	key	A single key which shall be mapped.
[in]	value	Value to which the range shall be mapped.

Insert() [4/4]

Result<void> Insert	(	const Range &	range,
		const V &	value
	)

Maps the given range to value. Existing overlapping mappings are truncated, split or removed as necessary, or they are merged with the new mapping if their values are equal. If the range is empty, nothing happens.

Parameters

[in]	range	Range which shall be mapped.
[in]	value	Value to which the range shall be mapped.

FindValue()

const V* FindValue

(

K

key

)

const

Finds the value associated with the given key in this map. There always exists such a value, so this function never returns nullptr.

Parameters

[in]

key

Key to search for.

Returns

Pointer to value for the given key, never nullptr.

FindRange()

const V* FindRange	(	K	key,
		Range &	rangeOut
	)		const

Finds the value associated with the given key in this map. There always exists such a value, so this function never returns nullptr. rangeOut is set to the range.

Parameters

[in]	key	Key to search for.
[out]	rangeOut	rangeOut is set to the found range.

Returns

Pointer to value for the given key, never nullptr.

ToString()

SFINAEHelper<String, K>::type ToString

(

const FormatStatement *

fmt = nullptr

)

const

Begin()

ConstIterator Begin

(

)

const

Returns an iterator pointing to the first entry of this map. The iteration order corresponds to the order of the ranges.

Returns

Iterator for this map pointing to the first element.

End()

ConstIterator End

(

)

const

Returns an iterator pointing just behind the last entry of this map. The iteration order corresponds to the order of the ranges.

Returns

Iterator for this map pointing behind the last element.

GetKeys()

ConstKeyIterator GetKeys

(

)

const

Returns a foreach iterator to iterate over all keys (i.e., ranges) of this map. This will yield all ranges in ascending order.

Returns

Foreach iterator over all keys (i.e., ranges).

GetValues()

ConstValueIterator GetValues

(

)

const

Returns a foreach iterator to iterate over all values of this map. This will yield all values in ascending order of the corresponding ranges.

Returns

Foreach iterator over all values.

GetMap()

const MapType& GetMap

(

)

const

GetHashCode()

HashInt GetHashCode

(

)

const

operator==()

Bool operator==

(

const ContiguousRangeMap< K, V, MAP > &

other

)

const

operator!=()

Bool operator!=

(

const ContiguousRangeMap< K, V, MAP > &

other

)

const

GetUnderlyingMap() [1/2]

const MapType& GetUnderlyingMap

(

)

const

GetUnderlyingMap() [2/2]

MapType& GetUnderlyingMap

(

)

MAXON_DISALLOW_COPY_AND_ASSIGN()

MAXON_DISALLOW_COPY_AND_ASSIGN ( ContiguousRangeMap< K, V, MAP >  )

private

Member Data Documentation

_map

MapType _map

private

The underlying map which maps each start of a range to the mapped value. The range ends one before the start of the next range.