Reference documentation for deal.II version 9.3.3
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Classes | Public Types | List of all members
LinearAlgebra::ReadWriteVector< Number > Class Template Reference
Linear algebra classes » Vector classes

#include <deal.II/lac/read_write_vector.h>

Inheritance diagram for LinearAlgebra::ReadWriteVector< Number >:
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Classes

class  FunctorTemplate
 

Public Types

using value_type = Number
 
using pointer = value_type *
 
using const_pointer = const value_type *
 
using iterator = value_type *
 
using const_iterator = const value_type *
 
using reference = value_type &
 
using const_reference = const value_type &
 
using size_type = types::global_dof_index
 
using real_type = typename numbers::NumberTraits< Number >::real_type
 

Public Member Functions

1: Basic Object-handling
 ReadWriteVector ()
 
 ReadWriteVector (const ReadWriteVector< Number > &in_vector)
 
 ReadWriteVector (const size_type size)
 
 ReadWriteVector (const IndexSet &locally_stored_indices)
 
 ~ReadWriteVector () override=default
 
virtual void reinit (const size_type size, const bool omit_zeroing_entries=false)
 
template<typename Number2 >
void reinit (const ReadWriteVector< Number2 > &in_vector, const bool omit_zeroing_entries=false)
 
virtual void reinit (const IndexSet &locally_stored_indices, const bool omit_zeroing_entries=false)
 
void reinit (const TrilinosWrappers::MPI::Vector &trilinos_vec)
 
template<typename Functor >
void apply (const Functor &func)
 
void swap (ReadWriteVector< Number > &v)
 
ReadWriteVector< Number > & operator= (const ReadWriteVector< Number > &in_vector)
 
template<typename Number2 >
ReadWriteVector< Number > & operator= (const ReadWriteVector< Number2 > &in_vector)
 
ReadWriteVector< Number > & operator= (const Number s)
 
void import (const ::Vector< Number > &vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const LinearAlgebra::Vector< Number > &vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
template<typename MemorySpace >
void import (const distributed::Vector< Number, MemorySpace > &vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const PETScWrappers::MPI::Vector &petsc_vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const TrilinosWrappers::MPI::Vector &trilinos_vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const TpetraWrappers::Vector< Number > &tpetra_vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const EpetraWrappers::Vector &epetra_vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
void import (const CUDAWrappers::Vector< Number > &cuda_vec, VectorOperation::values operation, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern={})
 
size_type size () const
 
size_type n_elements () const
 
size_type locally_owned_size () const
 
const IndexSet & get_stored_elements () const
 
iterator begin ()
 
const_iterator begin () const
 
iterator end ()
 
const_iterator end () const
 
2: Data-Access
Number operator() (const size_type global_index) const
 
Number & operator() (const size_type global_index)
 
Number operator[] (const size_type global_index) const
 
Number & operator[] (const size_type global_index)
 
template<typename Number2 >
void extract_subvector_to (const std::vector< size_type > &indices, std::vector< Number2 > &values) const
 
template<typename ForwardIterator , typename OutputIterator >
void extract_subvector_to (ForwardIterator indices_begin, const ForwardIterator indices_end, OutputIterator values_begin) const
 
Number local_element (const size_type local_index) const
 
Number & local_element (const size_type local_index)
 

3: Modification of vectors

IndexSet stored_elements
 
IndexSet source_stored_elements
 
std::shared_ptr< Utilities::MPI::CommunicationPatternBase > comm_pattern
 
std::unique_ptr< Number[], decltype(std::free) * > values
 
std::shared_ptr<::parallel::internal::TBBPartitioner > thread_loop_partitioner
 
template<typename Number2 >
class ReadWriteVector
 
template<typename Number2 >
void add (const std::vector< size_type > &indices, const std::vector< Number2 > &values)
 
template<typename Number2 >
void add (const std::vector< size_type > &indices, const ReadWriteVector< Number2 > &values)
 
template<typename Number2 >
void add (const size_type n_elements, const size_type *indices, const Number2 *values)
 
void print (std::ostream &out, const unsigned int precision=3, const bool scientific=true) const
 
std::size_t memory_consumption () const
 
void import (const Tpetra::Vector< Number, int, types::global_dof_index > &tpetra_vector, const IndexSet &locally_owned_elements, VectorOperation::values operation, const MPI_Comm &mpi_comm, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern)
 
void import (const Epetra_MultiVector &multivector, const IndexSet &locally_owned_elements, VectorOperation::values operation, const MPI_Comm &mpi_comm, const std::shared_ptr< const Utilities::MPI::CommunicationPatternBase > &communication_pattern)
 
unsigned int global_to_local (const types::global_dof_index global_index) const
 
void resize_val (const size_type new_allocated_size)
 
TpetraWrappers::CommunicationPattern create_tpetra_comm_pattern (const IndexSet &source_index_set, const MPI_Comm &mpi_comm)
 
EpetraWrappers::CommunicationPattern create_epetra_comm_pattern (const IndexSet &source_index_set, const MPI_Comm &mpi_comm)
 

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
 
template<class Archive >
void serialize (Archive &ar, const unsigned int version)
 
using map_value_type = decltype(counter_map)::value_type
 
using map_iterator = decltype(counter_map)::iterator
 
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 std::mutex mutex
 
static ::ExceptionBase & ExcInUse (int arg1, std::string arg2, std::string arg3)
 
static ::ExceptionBase & ExcNoSubscriber (std::string arg1, std::string arg2)
 
void check_no_subscribers () const noexcept
 

Detailed Description

template<typename Number>
class LinearAlgebra::ReadWriteVector< Number >

ReadWriteVector is intended to represent vectors in \({\mathbb R}^N\) for which it stores all or a subset of elements. The latter case in important in parallel computations, where \(N\) may be so large that no processor can actually all elements of a solution vector, but where this is also not necessary: one typically only has to store the values of degrees of freedom that live on cells that are locally owned plus potentially those degrees of freedom that live on ghost cells.

This class allows to access individual elements to be read or written. However, it does not allow global operations such as taking the norm. ReadWriteVector can be used to read and write elements in vectors derived from VectorSpaceVector such as TrilinosWrappers::MPI::Vector and PETScWrappers::MPI::Vector.

Storing elements

Most of the time, one will simply read from or write into a vector of the current class using the global numbers of these degrees of freedom. This is done using operator()() or operator[]() which call global_to_local() to transform the global index into a local one. In such cases, it is clear that one can only access elements of the vector that the current object indeed stores.

However, it is also possible to access elements in the order in which they are stored by the current object. In other words, one is not interested in accessing elements with their global indices, but instead using an enumeration that only takes into account the elements that are actually stored. This is facilitated by the local_element() function. To this end, it is necessary to know in which order the current class stores its element. The elements of all the consecutive ranges are stored in ascending order of the first index of each range. The function IndexSet::largest_range_starting_index() can be used to get the first index of the largest range.

Definition at line 133 of file read_write_vector.h.

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