SG::Decorator< T, ALLOC > Class Template Reference

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

#include <Decorator.h>

Collaboration diagram for SG::Decorator< 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	const_container_pointer_type = typename AuxDataTraits< T, ALLOC >::const_container_pointer_type
using	span = typename AuxDataTraits< T, ALLOC >::span
	A span over elements in the container. More...
using	const_span = typename AuxDataTraits< T, ALLOC >::const_span

Public Member Functions
	Decorator (const std::string &name)
	Constructor. More...
	Decorator (const std::string &name, const std::string &clsname)
	Constructor. More...
	Decorator (const SG::auxid_t auxid)
	Constructor taking an auxid directly. More...
template<class ELT >
reference_type	operator() (const ELT &e) const
	Fetch the variable for one element, as a non-const reference. More...
reference_type	operator() (const AuxVectorData &container, size_t index) const
	Fetch the variable for one element, as a non-const reference. More...
template<class ELT >
void	set (const ELT &e, const element_type &x) const
	Set the variable for one element. More...
const_container_pointer_type	getDataArray (const AuxVectorData &container) const
	Get a pointer to the start of the auxiliary data array. More...
container_pointer_type	getDecorationArray (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...
span	getDecorationSpan (const AuxVectorData &container) const
	Get a span over the auxilary data array. More...
template<class ELT >
bool	isAvailable (const ELT &e) const
	Test to see if this variable exists in the store. More...
template<class ELT >
bool	isAvailableWritable (const ELT &e) const
	Test to see if this variable exists in the store and is writable. More...
bool	isAvailable (const AuxVectorData &c) const
	Test to see if this variable exists in the store. More...
bool	isAvailableWritable (const AuxVectorData &c) const
	Test to see if this variable exists in the store and is writable. More...
SG::auxid_t	auxid () const
	Return the aux id for this variable. More...

Protected Member Functions
	Decorator (const std::string &name, const std::string &clsname, const SG::AuxVarFlags flags)
	Constructor. More...
	Decorator (const SG::auxid_t auxid, const SG::AuxVarFlags flags)
	Constructor taking an auxid directly. More...

Private Attributes
SG::auxid_t	m_auxid
	The cached auxid. More...

Detailed Description

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

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

This is like Accessor, except that it only ‘decorates’ the container. What this means is that this object can operate on a const container and return a non-const reference. However, if the container is locked, this will only work if either this is a reference to a new variable, in which case it is marked as a decoration, or it is a reference to a variable already marked as a decoration.

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.
static const SG::Decorator<int> vint1 ("myInt");
...
const DataVector<MyClass>* v = ...;
const Myclass* m = v->at(2);
vint1 (*m) = 123;

Definition at line 58 of file Decorator.h.

Member Typedef Documentation

const_container_pointer_type

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

using SG::Decorator< T, ALLOC >::const_container_pointer_type = typename AuxDataTraits<T, ALLOC>::const_container_pointer_type

Definition at line 70 of file Decorator.h.

const_span

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

using SG::Decorator< T, ALLOC >::const_span = typename AuxDataTraits<T, ALLOC>::const_span

Definition at line 75 of file Decorator.h.

container_pointer_type

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

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

Pointer into the container holding this item.

Definition at line 68 of file Decorator.h.

element_type

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

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

Type the user sees.

Definition at line 65 of file Decorator.h.

reference_type

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

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

Type referencing an item.

Definition at line 62 of file Decorator.h.

span

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

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

A span over elements in the container.

Definition at line 74 of file Decorator.h.

Constructor & Destructor Documentation

Decorator() [1/5]

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

SG::Decorator< T, ALLOC >::Decorator

(

const std::string &

name

)

Constructor.

Parameters

name	Name of this aux variable.

The name -> auxid lookup is done here.

Decorator() [2/5]

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

SG::Decorator< T, ALLOC >::Decorator	(	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.

Decorator() [3/5]

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

SG::Decorator< T, ALLOC >::Decorator

(

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.

Decorator() [4/5]

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

SG::Decorator< T, ALLOC >::Decorator ( const std::string &  name, const std::string &  clsname, const SG::AuxVarFlags  flags  )

protected

Constructor.

Parameters

name	Name of this aux variable.
clsname	The name of its associated class. May be blank.
flags	Optional flags qualifying the type. See AuxTypeRegsitry.

The name -> auxid lookup is done here.

Decorator() [5/5]

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

SG::Decorator< T, ALLOC >::Decorator ( const SG::auxid_t  auxid, const SG::AuxVarFlags  flags  )

protected

Constructor taking an auxid directly.

Parameters

auxid	ID for this auxiliary variable.
flags	Optional flags qualifying the type. See AuxTypeRegistry.

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

Member Function Documentation

auxid()

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

SG::auxid_t SG::Decorator< T, ALLOC >::auxid

(

)

const

Return the aux id for this variable.

getDataArray()

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

const_container_pointer_type SG::Decorator< T, ALLOC >::getDataArray

(

const AuxVectorData &

container

)

const

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

Parameters

container

The container from which to fetch the variable.

getDataSpan()

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

const_span SG::Decorator< T, ALLOC >::getDataSpan

(

const AuxVectorData &

container

)

const

Get a span over the auxilary data array.

Parameters

container

The container from which to fetch the variable.

getDecorationArray()

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

container_pointer_type SG::Decorator< T, ALLOC >::getDecorationArray

(

const AuxVectorData &

container

)

const

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

Parameters

container

The container from which to fetch the variable.

If the container is locked, this will allow fetching only variables that do not yet exist (in which case they will be marked as decorations) or variables already marked as decorations.

getDecorationSpan()

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

span SG::Decorator< T, ALLOC >::getDecorationSpan

(

const AuxVectorData &

container

)

const

Get a span over the auxilary data array.

Parameters

container

The container from which to fetch the variable.

If the container is locked, this will allow fetching only variables that do not yet exist (in which case they will be marked as decorations) or variables already marked as decorations.

isAvailable() [1/2]

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

bool SG::Decorator< T, ALLOC >::isAvailable

(

const AuxVectorData &

c

)

const

Test to see if this variable exists in the store.

Parameters

c	The container in which to test the variable.

isAvailable() [2/2]

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

template<class ELT >

bool SG::Decorator< T, ALLOC >::isAvailable

(

const ELT &

e

)

const

Test to see if this variable exists in the store.

Parameters

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

isAvailableWritable() [1/2]

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

bool SG::Decorator< T, ALLOC >::isAvailableWritable

(

const AuxVectorData &

c

)

const

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

Parameters

c	The container in which to test the variable.

isAvailableWritable() [2/2]

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

template<class ELT >

bool SG::Decorator< T, ALLOC >::isAvailableWritable

(

const ELT &

e

)

const

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

Parameters

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

operator()() [1/2]

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

reference_type SG::Decorator< T, ALLOC >::operator()	(	const 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.

If the container is locked, this will allow fetching only variables that do not yet exist (in which case they will be marked as decorations) or variables already marked as decorations.

operator()() [2/2]

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

template<class ELT >

reference_type SG::Decorator< T, ALLOC >::operator()

(

const ELT &

e

)

const

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

Parameters

e	The element for which to fetch the variable.

If the container is locked, this will allow fetching only variables that do not yet exist (in which case they will be marked as decorations) or variables already marked as decorations.

set()

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

template<class ELT >

void SG::Decorator< T, ALLOC >::set	(	const 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.

Member Data Documentation

m_auxid

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

SG::auxid_t SG::Decorator< T, ALLOC >::m_auxid

private

The cached auxid.

Definition at line 249 of file Decorator.h.

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

• Decorator.h