lvr2::VectorMap< HandleT, ValueT > Class Template Reference

A map with constant lookup overhead using small-ish integer-keys. More...

#include <VectorMap.hpp>

Inheritance diagram for lvr2::VectorMap< HandleT, ValueT >:

Public Member Functions
AttributeMapHandleIteratorPtr< HandleT >	begin () const final
	Returns an iterator over all keys of this map. The order of iteration is unspecified. More...
void	clear () final
	Removes all values from the map. More...
bool	containsKey (HandleT key) const final
	Returns true iff the map contains a value associated with the given key. More...
AttributeMapHandleIteratorPtr< HandleT >	end () const final
	Returns an iterator to the end of all keys. More...
boost::optional< ValueT >	erase (HandleT key) final
	Removes the value associated with the given key. More...
boost::optional< const ValueT & >	get (HandleT key) const final
	Returns the value associated with the given key or None if there is no associated value. More...
boost::optional< ValueT & >	get (HandleT key) final
	Returns the value associated with the given key or None if there is no associated value. More...
boost::optional< ValueT >	insert (HandleT key, const ValueT &value) final
	Inserts the given value at the given key position. More...
size_t	numValues () const final
	Returns the number of values in this map. More...
void	reserve (size_t newCap)
	VectorMap ()
	Creates an empty map without default element set. More...
	VectorMap (const ValueT &defaultValue)
	Creates a map with a given default value. More...
	VectorMap (size_t countElements, const boost::shared_array< ValueT > &values)
	VectorMap (size_t countElements, const ValueT &defaultValue)
	Creates a map with a given default value and calls reserve. More...
Public Member Functions inherited from lvr2::AttributeMap< HandleT, ValueT >
ValueT &	operator[] (HandleT key)
	Returns the value associated with the given key or panics if there is no associated value. More...
const ValueT &	operator[] (HandleT key) const
	Returns the value associated with the given key or panics if there is no associated value. More...

Private Attributes
boost::optional< ValueT >	m_default
StableVector< HandleT, ValueT >	m_vec
	The underlying storage. More...

Additional Inherited Members
Public Types inherited from lvr2::AttributeMap< HandleT, ValueT >
typedef HandleT	HandleType
	The type of the handle used as key in this map. More...
typedef ValueT	ValueType
	The type of the value stored in this map. More...

Detailed Description

template<typename HandleT, typename ValueT>
class lvr2::VectorMap< HandleT, ValueT >

A map with constant lookup overhead using small-ish integer-keys.

It stores the given values in a vector, they key is simply the index within the vector. This means that the space requirement is O(largest_key). See StableVector for more information.

Definition at line 60 of file VectorMap.hpp.

Constructor & Destructor Documentation

VectorMap() [1/4]

template<typename HandleT , typename ValueT >

lvr2::VectorMap< HandleT, ValueT >::VectorMap ( )

inline

Creates an empty map without default element set.

Definition at line 66 of file VectorMap.hpp.

VectorMap() [2/4]

template<typename HandleT , typename ValueT >

lvr2::VectorMap< HandleT, ValueT >::VectorMap

(

const ValueT &

defaultValue

)

Creates a map with a given default value.

Whenever you request a value for a key and there isn't a value associated with that key, the default value is returned. Note that if you set a default value (which you do by calling this constructor), you can't remove it. Neither erase() nor clear() will do it. Calls to get() will always return a non-none value and operator[] won't ever panic.

One additional important detail: if you call get() to obtain a mutable reference, the default value is inserted into the map. This is the only sane way to return a mutably reference.

VectorMap() [3/4]

template<typename HandleT , typename ValueT >

lvr2::VectorMap< HandleT, ValueT >::VectorMap	(	size_t	countElements,
		const ValueT &	defaultValue
	)

Creates a map with a given default value and calls reserve.

This works exactly as the VectorMap(const Value&) constructor, but also calls reserve(countElements) immediately afterwards.

VectorMap() [4/4]

template<typename HandleT , typename ValueT >

lvr2::VectorMap< HandleT, ValueT >::VectorMap	(	size_t	countElements,
		const boost::shared_array< ValueT > &	values
	)

Member Function Documentation

begin()

template<typename HandleT , typename ValueT >

AttributeMapHandleIteratorPtr<HandleT> lvr2::VectorMap< HandleT, ValueT >::begin ( ) const

finalvirtual

Returns an iterator over all keys of this map. The order of iteration is unspecified.

You can simply iterate over all keys of this map with a range-based for-loop:

for (auto handle: attributeMap) { ... }

Implements lvr2::AttributeMap< HandleT, ValueT >.

clear()

template<typename HandleT , typename ValueT >

void lvr2::VectorMap< HandleT, ValueT >::clear ( )

finalvirtual

Removes all values from the map.

Implements lvr2::AttributeMap< HandleT, ValueT >.

containsKey()

template<typename HandleT , typename ValueT >

bool lvr2::VectorMap< HandleT, ValueT >::containsKey ( HandleT  key ) const

finalvirtual

Returns true iff the map contains a value associated with the given key.

Implements lvr2::AttributeMap< HandleT, ValueT >.

end()

template<typename HandleT , typename ValueT >

AttributeMapHandleIteratorPtr<HandleT> lvr2::VectorMap< HandleT, ValueT >::end ( ) const

finalvirtual

Returns an iterator to the end of all keys.

Implements lvr2::AttributeMap< HandleT, ValueT >.

erase()

template<typename HandleT , typename ValueT >

boost::optional<ValueT> lvr2::VectorMap< HandleT, ValueT >::erase ( HandleT  key )

finalvirtual

Removes the value associated with the given key.

Returns

If there was a value associated with the key, it is returned. None otherwise.

Implements lvr2::AttributeMap< HandleT, ValueT >.

get() [1/2]

template<typename HandleT , typename ValueT >

boost::optional<const ValueT&> lvr2::VectorMap< HandleT, ValueT >::get ( HandleT  key ) const

finalvirtual

Returns the value associated with the given key or None if there is no associated value.

Note: this method can not be used to insert a new value. It only allows reading an already inserted value.

Implements lvr2::AttributeMap< HandleT, ValueT >.

get() [2/2]

template<typename HandleT , typename ValueT >

boost::optional<ValueT&> lvr2::VectorMap< HandleT, ValueT >::get ( HandleT  key )

finalvirtual

Returns the value associated with the given key or None if there is no associated value.

Note: this method can not be used to insert a new value. It only allows reading and modifying an already inserted value.

Implements lvr2::AttributeMap< HandleT, ValueT >.

insert()

template<typename HandleT , typename ValueT >

boost::optional<ValueT> lvr2::VectorMap< HandleT, ValueT >::insert ( HandleT  key, const ValueT &  value  )

finalvirtual

Inserts the given value at the given key position.

Returns

If there was a value associated with the given key before inserting the new value, the old value is returned. None otherwise.

Implements lvr2::AttributeMap< HandleT, ValueT >.

numValues()

template<typename HandleT , typename ValueT >

size_t lvr2::VectorMap< HandleT, ValueT >::numValues ( ) const

finalvirtual

Returns the number of values in this map.

Implements lvr2::AttributeMap< HandleT, ValueT >.

reserve()

template<typename HandleT , typename ValueT >

void lvr2::VectorMap< HandleT, ValueT >::reserve

(

size_t

newCap

)

See also

StableVector::reserve(size_t)

Member Data Documentation

m_default

template<typename HandleT , typename ValueT >

boost::optional<ValueT> lvr2::VectorMap< HandleT, ValueT >::m_default

private

Definition at line 117 of file VectorMap.hpp.

m_vec

template<typename HandleT , typename ValueT >

StableVector<HandleT, ValueT> lvr2::VectorMap< HandleT, ValueT >::m_vec

private

The underlying storage.

Definition at line 116 of file VectorMap.hpp.

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

• VectorMap.hpp