ZeroTensorFunction< rank, dim, Number > Class Template Reference

#include <deal.II/base/tensor_function.h>

Inheritance diagram for ZeroTensorFunction< rank, dim, Number >:

Public Types
using	time_type
using	value_type
using	gradient_type

Public Member Functions
	ZeroTensorFunction (const time_type initial_time=0.0)
virtual typename::TensorFunction< rank, dim, double >::value_type	value (const Point< dim > &p) const override
virtual void	value_list (const std::vector< Point< dim > > &points, std::vector< typename ::TensorFunction< rank, dim, double >::value_type > &values) const override
virtual void	value_list (const std::vector< Point< dim > > &points, std::vector< value_type > &values) const
virtual typename::TensorFunction< rank, dim, double >::gradient_type	gradient (const Point< dim > &p) const override
virtual void	gradient_list (const std::vector< Point< dim > > &points, std::vector< typename ::TensorFunction< rank, dim, double >::gradient_type > &gradients) const override
virtual void	gradient_list (const std::vector< Point< dim > > &points, std::vector< gradient_type > &gradients) const
numbers::NumberTraits< double >::real_type	get_time () const
virtual void	set_time (const numbers::NumberTraits< double >::real_type new_time)
virtual void	advance_time (const numbers::NumberTraits< double >::real_type delta_t)
template<class Archive >
void	serialize (Archive &ar, const unsigned int version)
Subscriptor functionality
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.
void	subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
void	unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
unsigned int	n_subscriptions () const
template<typename StreamType >
void	list_subscribers (StreamType &stream) const
void	list_subscribers () const

Static Public Member Functions
static ::ExceptionBase &	ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase &	ExcNoSubscriber (std::string arg1, std::string arg2)

Private Types
using	map_value_type = decltype(counter_map)::value_type
using	map_iterator = decltype(counter_map)::iterator

Private Member Functions
void	check_no_subscribers () const noexcept

Private Attributes
const ::Tensor< rank, dim, double >	_value
numbers::NumberTraits< double >::real_type	time
std::atomic< unsigned int >	counter
std::map< std::string, unsigned int >	counter_map
std::vector< std::atomic< bool > * >	validity_pointers
const std::type_info *	object_info

Static Private Attributes
static std::mutex	mutex

Detailed Description

template<int rank, int dim, typename Number = double>
class ZeroTensorFunction< rank, dim, Number >

Provide a tensor valued function which always returns zero. Obviously, all derivates of this function are zero.

Definition at line 181 of file tensor_function.h.

Member Typedef Documentation

time_type

template<int rank, int dim, typename Number = double>

using ZeroTensorFunction< rank, dim, Number >::time_type

Initial value:

 
    typename ConstantTensorFunction<rank, dim, Number>::time_type

The scalar-valued real type used for representing time.

Definition at line 187 of file tensor_function.h.

value_type

using TensorFunction< rank, dim, double >::value_type

inherited

Alias for the return types of the value function.

Definition at line 63 of file tensor_function.h.

gradient_type

using TensorFunction< rank, dim, double >::gradient_type

inherited

Alias for the return types of the gradient functions.

Definition at line 68 of file tensor_function.h.

map_value_type

using Subscriptor::map_value_type = decltype(counter_map)::value_type

privateinherited

The data type used in counter_map.

Definition at line 229 of file subscriptor.h.

map_iterator

using Subscriptor::map_iterator = decltype(counter_map)::iterator

privateinherited

The iterator type used in counter_map.

Definition at line 234 of file subscriptor.h.

Constructor & Destructor Documentation

ZeroTensorFunction()

template<int rank, int dim, typename Number = double>

ZeroTensorFunction< rank, dim, Number >::ZeroTensorFunction

(

const time_type

initial_time = 0.0

)

Constructor.

An initial value for the time variable may be specified, otherwise it defaults to zero.

Member Function Documentation

value()

virtual typename::TensorFunction< rank, dim, double >::value_type ConstantTensorFunction< rank, dim, double >::value ( const Point< dim > & p ) const

overridevirtualinherited

Return the value of the function at the given point.

Reimplemented from TensorFunction< rank, dim, double >.

value_list() [1/2]

virtual void ConstantTensorFunction< rank, dim, double >::value_list ( const std::vector< Point< dim > > & points, std::vector< typename ::TensorFunction< rank, dim, double >::value_type > & values ) const

overridevirtualinherited

value_list() [2/2]

virtual void TensorFunction< rank, dim, double >::value_list ( const std::vector< Point< dim > > & points, std::vector< value_type > & values ) const

virtualinherited

Set values to the point values of the function at the points. It is assumed that values already has the right size, i.e. the same size as the points array.

gradient()

virtual typename::TensorFunction< rank, dim, double >::gradient_type ConstantTensorFunction< rank, dim, double >::gradient ( const Point< dim > & p ) const

overridevirtualinherited

Return the gradient of the function at the given point.

Reimplemented from TensorFunction< rank, dim, double >.

gradient_list() [1/2]

virtual void ConstantTensorFunction< rank, dim, double >::gradient_list ( const std::vector< Point< dim > > & points, std::vector< typename ::TensorFunction< rank, dim, double >::gradient_type > & gradients ) const

overridevirtualinherited

gradient_list() [2/2]

virtual void TensorFunction< rank, dim, double >::gradient_list ( const std::vector< Point< dim > > & points, std::vector< gradient_type > & gradients ) const

virtualinherited

Set gradients to the gradients of the function at the points. It is assumed that values already has the right size, i.e. the same size as the points array.

get_time()

numbers::NumberTraits< double >::real_type FunctionTime< numbers::NumberTraits< double >::real_type >::get_time ( ) const

inherited

Return the value of the time variable.

set_time()

virtual void FunctionTime< numbers::NumberTraits< double >::real_type >::set_time ( const numbers::NumberTraits< double >::real_type new_time )

virtualinherited

Set the time to new_time, overwriting the old value.

advance_time()

virtual void FunctionTime< numbers::NumberTraits< double >::real_type >::advance_time ( const numbers::NumberTraits< double >::real_type delta_t )

virtualinherited

Advance the time by the given time step delta_t.

subscribe()

void Subscriptor::subscribe ( std::atomic< bool > *const validity, const std::string & identifier = "" ) const

inherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 135 of file subscriptor.cc.

unsubscribe()

void Subscriptor::unsubscribe ( std::atomic< bool > *const validity, const std::string & identifier = "" ) const

inherited

Unsubscribes a user from the object.

Note

The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 155 of file subscriptor.cc.

n_subscriptions()

unsigned int Subscriptor::n_subscriptions ( ) const

inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 300 of file subscriptor.h.

list_subscribers() [1/2]

template<typename StreamType >

void Subscriptor::list_subscribers ( StreamType & stream ) const

inlineinherited

List the subscribers to the input stream.

Definition at line 317 of file subscriptor.h.

list_subscribers() [2/2]

void Subscriptor::list_subscribers ( ) const

inherited

List the subscribers to deallog.

Definition at line 203 of file subscriptor.cc.

serialize()

template<class Archive >

void Subscriptor::serialize ( Archive & ar, const unsigned int version )

inlineinherited

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 309 of file subscriptor.h.

check_no_subscribers()

void Subscriptor::check_no_subscribers ( ) const

privatenoexceptinherited

Check that there are no objects subscribing to this object. If this check passes then it is safe to destroy the current object. It this check fails then this function will either abort or print an error message to deallog (by using the AssertNothrow mechanism), but will not throw an exception.

Note

Since this function is just a consistency check it does nothing in release mode.

If this function is called when there is an uncaught exception then, rather than aborting, this function prints an error message to the standard error stream and returns.

Definition at line 52 of file subscriptor.cc.

Member Data Documentation

_value

const ::Tensor<rank, dim, double> ConstantTensorFunction< rank, dim, double >::_value

privateinherited

Definition at line 169 of file tensor_function.h.

time

numbers::NumberTraits< double >::real_type FunctionTime< numbers::NumberTraits< double >::real_type >::time

privateinherited

Store the present time.

Definition at line 112 of file function_time.h.

counter

std::atomic<unsigned int> Subscriptor::counter

mutableprivateinherited

Store the number of objects which subscribed to this object. Initially, this number is zero, and upon destruction it shall be zero again (i.e. all objects which subscribed should have unsubscribed again).

The creator (and owner) of an object is counted in the map below if HE manages to supply identification.

We use the mutable keyword in order to allow subscription to constant objects also.

This counter may be read from and written to concurrently in multithreaded code: hence we use the std::atomic class template.

Definition at line 218 of file subscriptor.h.

counter_map

std::map<std::string, unsigned int> Subscriptor::counter_map

mutableprivateinherited

In this map, we count subscriptions for each different identification string supplied to subscribe().

Definition at line 224 of file subscriptor.h.

validity_pointers

std::vector<std::atomic<bool> *> Subscriptor::validity_pointers

mutableprivateinherited

In this vector, we store pointers to the validity bool in the SmartPointer objects that subscribe to this class.

Definition at line 240 of file subscriptor.h.

object_info

const std::type_info* Subscriptor::object_info

mutableprivateinherited

Pointer to the typeinfo object of this object, from which we can later deduce the class name. Since this information on the derived class is neither available in the destructor, nor in the constructor, we obtain it in between and store it here.

Definition at line 248 of file subscriptor.h.

mutex

std::mutex Subscriptor::mutex

staticprivateinherited

A mutex used to ensure data consistency when accessing the mutable members of this class. This lock is used in the subscribe() and unsubscribe() functions, as well as in list_subscribers().

Definition at line 271 of file subscriptor.h.

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

• include/deal.II/base/tensor_function.h