Helper class to provide type-safe access to aux data. More...

#include <Accessor.h>

Inheritance diagram for SG::Accessor< T, ALLOC >:

Collaboration diagram for SG::Accessor< T, ALLOC >:

Public Types
using	reference_type = typename AuxDataTraits< T, ALLOC >::reference_type
	Type referencing an item. More...

using	element_type = typename AuxDataTraits< T, ALLOC >::element_type
	Type the user sees. More...

using	container_pointer_type = typename AuxDataTraits< T, ALLOC >::container_pointer_type
	Pointer into the container holding this item. More...

using	span = typename AuxDataTraits< T, ALLOC >::span
	A span over elements in the container. More...

using	const_reference_type = typename AuxDataTraits< T, AuxAllocator_t< T > >::const_reference_type
	Type referencing an item. More...

using	const_container_pointer_type = typename AuxDataTraits< T, AuxAllocator_t< T > >::const_container_pointer_type
	Pointer into the container holding this item. More...

using	const_span = typename AuxDataTraits< T, AuxAllocator_t< T > >::const_span
	A span over elements in the container. More...

Public Member Functions
	Accessor (const std::string &name)
	Constructor. More...

	Accessor (const std::string &name, const std::string &clsname)
	Constructor. More...

	Accessor (const SG::auxid_t auxid)
	Constructor taking an auxid directly. More...

template<class ELT >
reference_type	operator() (ELT &e) const
	Fetch the variable for one element, as a non-const reference. More...

reference_type	operator() (AuxVectorData &container, size_t index) const
	Fetch the variable for one element, as a non-const reference. More...

template<class ELT >
void	set (ELT &e, const element_type &x) const
	Set the variable for one element. More...

container_pointer_type	getDataArray (AuxVectorData &container) const
	Get a pointer to the start of the auxiliary data array. More...

span	getDataSpan (AuxVectorData &container) const
	Get a span over the auxilary data array. More...

template<class ELT >
bool	isAvailableWritable (ELT &e) const
	Test to see if this variable exists in the store and is writable. More...

const_reference_type	operator() (const ELT &e) const
	Fetch the variable for one element, as a const reference. More...

const_reference_type	operator() (const AuxVectorData &container, size_t index) const
	Fetch the variable for one element, as a const reference. More...

const_reference_type	withDefault (const ELT &e, const T &deflt) const
	Fetch the variable for one element, as a const reference, with a default. More...

const_reference_type	withDefault (const AuxVectorData &container, size_t index, const T &deflt) const
	Fetch the variable for one element, as a const reference. More...

const_container_pointer_type	getDataArray (const AuxVectorData &container) const
	Get a pointer to the start of the auxiliary data array. More...

const_span	getDataSpan (const AuxVectorData &container) const
	Get a span over the auxilary data array. More...

bool	isAvailable (const ELT &e) const
	Test to see if this variable exists in the store. More...

SG::auxid_t	auxid () const
	Return the aux id for this variable. More...

Protected Attributes
SG::auxid_t	m_auxid
	The cached `auxid`. More...

Detailed Description

template<class T, class ALLOC = AuxAllocator_t<T>>
class SG::Accessor< T, ALLOC >

Helper class to provide type-safe access to aux data.

This is written as a separate class in order to be able to cache the name -> auxid lookup.

You might use this something like this:

// Only need to do this once.
SG::Accessor<int> vint1 ("myInt");
...
const Myclass* m = ...;
int x = vint1 (*m);

You can also use this to define getters/setters in your class:

class Myclass {
  ...
  int get_x() const
  { const static Accessor<int> acc ("x", "Myclass");
    return acc (*this); }
  int& get_x()
  { const static Accessor<int> acc ("x", "Myclass");
    return acc (*this); }

Definition at line 64 of file Control/AthContainers/AthContainers/Accessor.h.

Member Typedef Documentation

◆ const_container_pointer_type

using SG::ConstAccessor< T, AuxAllocator_t< T > >::const_container_pointer_type = typename AuxDataTraits<T, AuxAllocator_t< T > >::const_container_pointer_type

inherited

Pointer into the container holding this item.

Definition at line 64 of file ConstAccessor.h.

◆ const_reference_type

using SG::ConstAccessor< T, AuxAllocator_t< T > >::const_reference_type = typename AuxDataTraits<T, AuxAllocator_t< T > >::const_reference_type

inherited

Type referencing an item.

Definition at line 60 of file ConstAccessor.h.

◆ const_span

using SG::ConstAccessor< T, AuxAllocator_t< T > >::const_span = typename AuxDataTraits<T, AuxAllocator_t< T > >::const_span

inherited

A span over elements in the container.

Definition at line 68 of file ConstAccessor.h.

◆ container_pointer_type

template<class T , class ALLOC = AuxAllocator_t<T>>

using SG::Accessor< T, ALLOC >::container_pointer_type = typename AuxDataTraits<T, ALLOC>::container_pointer_type

Pointer into the container holding this item.

Definition at line 75 of file Control/AthContainers/AthContainers/Accessor.h.

◆ element_type

template<class T , class ALLOC = AuxAllocator_t<T>>

using SG::Accessor< T, ALLOC >::element_type = typename AuxDataTraits<T, ALLOC>::element_type

Type the user sees.

Definition at line 72 of file Control/AthContainers/AthContainers/Accessor.h.

◆ reference_type

template<class T , class ALLOC = AuxAllocator_t<T>>

using SG::Accessor< T, ALLOC >::reference_type = typename AuxDataTraits<T, ALLOC>::reference_type

Type referencing an item.

Definition at line 69 of file Control/AthContainers/AthContainers/Accessor.h.

◆ span

template<class T , class ALLOC = AuxAllocator_t<T>>

using SG::Accessor< T, ALLOC >::span = typename AuxDataTraits<T, ALLOC>::span

A span over elements in the container.

Definition at line 79 of file Control/AthContainers/AthContainers/Accessor.h.

Constructor & Destructor Documentation

◆ Accessor() [1/3]

template<class T , class ALLOC = AuxAllocator_t<T>>

SG::Accessor< T, ALLOC >::Accessor ( const std::string & name )

Constructor.

Parameters

name	Name of this aux variable.

The name -> auxid lookup is done here.

◆ Accessor() [2/3]

template<class T , class ALLOC = AuxAllocator_t<T>>

SG::Accessor< T, ALLOC >::Accessor	(	const std::string &	name,
		const std::string &	clsname
	)

Constructor.

Parameters

name	Name of this aux variable.
clsname	The name of its associated class. May be blank.

The name -> auxid lookup is done here.

◆ Accessor() [3/3]

template<class T , class ALLOC = AuxAllocator_t<T>>

SG::Accessor< T, ALLOC >::Accessor ( const SG::auxid_t auxid )

Constructor taking an auxid directly.

Parameters

auxid ID for this auxiliary variable.

Will throw SG::ExcAuxTypeMismatch if the types don't match.

Member Function Documentation

◆ auxid()

SG::auxid_t SG::ConstAccessor< T, AuxAllocator_t< T > >::auxid

inherited

Return the aux id for this variable.

◆ getDataArray() [1/2]

template<class T , class ALLOC = AuxAllocator_t<T>>

container_pointer_type SG::Accessor< T, ALLOC >::getDataArray ( AuxVectorData & container ) const

Get a pointer to the start of the auxiliary data array.

Parameters

container The container from which to fetch the variable.

◆ getDataArray() [2/2]

const_container_pointer_type SG::ConstAccessor< T, AuxAllocator_t< T > >::getDataArray ( const AuxVectorData & container ) const

inherited

Get a pointer to the start of the auxiliary data array.

Parameters

container The container from which to fetch the variable.

◆ getDataSpan() [1/2]

template<class T , class ALLOC = AuxAllocator_t<T>>

span SG::Accessor< T, ALLOC >::getDataSpan ( AuxVectorData & container ) const

Get a span over the auxilary data array.

Parameters

container The container from which to fetch the variable.

◆ getDataSpan() [2/2]

const_span SG::ConstAccessor< T, AuxAllocator_t< T > >::getDataSpan ( const AuxVectorData & container ) const

inherited

Get a span over the auxilary data array.

Parameters

container The container from which to fetch the variable.

◆ isAvailable()

bool SG::ConstAccessor< T, AuxAllocator_t< T > >::isAvailable ( const ELT & e ) const

inherited

Test to see if this variable exists in the store.

Parameters

e	An element of the container which to test the variable.

◆ isAvailableWritable()

template<class T , class ALLOC = AuxAllocator_t<T>>

template<class ELT >

bool SG::Accessor< T, ALLOC >::isAvailableWritable ( ELT & e ) const

Test to see if this variable exists in the store and is writable.

Parameters

e	An element of the container which to test the variable.

◆ operator()() [1/4]

template<class T , class ALLOC = AuxAllocator_t<T>>

reference_type SG::Accessor< T, ALLOC >::operator()	(	AuxVectorData &	container,
		size_t	index
	)		const

Fetch the variable for one element, as a non-const reference.

Parameters

container	The container from which to fetch the variable.
index	The index of the desired element.

This allows retrieving aux data by container / index. Looping over the index via this method will be faster then looping over the elements of the container.

◆ operator()() [2/4]

const_reference_type SG::ConstAccessor< T, AuxAllocator_t< T > >::operator()	(	const AuxVectorData &	container,
		size_t	index
	)		const

inherited

Fetch the variable for one element, as a const reference.

Parameters

container	The container from which to fetch the variable.
index	The index of the desired element.

This allows retrieving aux data by container / index. Looping over the index via this method will be faster then looping over the elements of the container.

◆ operator()() [3/4]

const_reference_type SG::ConstAccessor< T, AuxAllocator_t< T > >::operator() ( const ELT & e ) const

inherited

Fetch the variable for one element, as a const reference.

Parameters

e	The element for which to fetch the variable.

◆ operator()() [4/4]

template<class T , class ALLOC = AuxAllocator_t<T>>

template<class ELT >

reference_type SG::Accessor< T, ALLOC >::operator() ( ELT & e ) const

Fetch the variable for one element, as a non-const reference.

Parameters

e	The element for which to fetch the variable.

◆ set()

template<class T , class ALLOC = AuxAllocator_t<T>>

template<class ELT >

void SG::Accessor< T, ALLOC >::set	(	ELT &	e,
		const element_type &	x
	)		const

Set the variable for one element.

Parameters

e	The element for which to fetch the variable.
x	The variable value to set.

◆ withDefault() [1/2]

const_reference_type SG::ConstAccessor< T, AuxAllocator_t< T > >::withDefault	(	const AuxVectorData &	container,
		size_t	index,
		const T &	deflt
	)		const

inherited

Fetch the variable for one element, as a const reference.

Parameters

container	The container from which to fetch the variable.
index	The index of the desired element.
deflt	Default value.

This allows retrieving aux data by container / index. Looping over the index via this method will be faster then looping over the elements of the container. If this variable is not available, then return deflt instead.

◆ withDefault() [2/2]

const_reference_type SG::ConstAccessor< T, AuxAllocator_t< T > >::withDefault	(	const ELT &	e,
		const T &	deflt
	)		const

inherited

Fetch the variable for one element, as a const reference, with a default.

Parameters

e	The element for which to fetch the variable.
deflt	Default value.

If this variable is not available, then return deflt instead.

Member Data Documentation

◆ m_auxid

SG::auxid_t SG::ConstAccessor< T, AuxAllocator_t< T > >::m_auxid

protectedinherited

The cached auxid.

Definition at line 206 of file ConstAccessor.h.

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

Control/AthContainers/AthContainers/Accessor.h

Public Types

Public Member Functions

Protected Attributes

Detailed Description

template<class T, class ALLOC = AuxAllocator_t<T>> class SG::Accessor< T, ALLOC >

Member Typedef Documentation

◆ const_container_pointer_type

◆ const_reference_type

◆ const_span

◆ container_pointer_type

◆ element_type

◆ reference_type

◆ span

Constructor & Destructor Documentation

◆ Accessor() [1/3]

◆ Accessor() [2/3]

◆ Accessor() [3/3]

Member Function Documentation

◆ auxid()

◆ getDataArray() [1/2]

◆ getDataArray() [2/2]

◆ getDataSpan() [1/2]

◆ getDataSpan() [2/2]

◆ isAvailable()

◆ isAvailableWritable()

◆ operator()() [1/4]

◆ operator()() [2/4]

◆ operator()() [3/4]

◆ operator()() [4/4]

◆ set()

◆ withDefault() [1/2]

◆ withDefault() [2/2]

Member Data Documentation

◆ m_auxid

template<class T, class ALLOC = AuxAllocator_t<T>>
class SG::Accessor< T, ALLOC >