Reference documentation for deal.II version 9.1.1

#include <deal.II/lac/block_indices.h>
Public Types  
using  size_type = types::global_dof_index 
Public Member Functions  
BlockIndices ()  
BlockIndices (const std::vector< size_type > &block_sizes)  
BlockIndices (BlockIndices &&b) noexcept  
BlockIndices (const BlockIndices &)=default  
BlockIndices (const unsigned int n_blocks, const size_type block_size=0)  
void  reinit (const unsigned int n_blocks, const size_type n_elements_per_block) 
void  reinit (const std::vector< size_type > &block_sizes) 
void  push_back (const size_type size) 
BlockIndices &  operator= (const BlockIndices &b) 
BlockIndices &  operator= (BlockIndices &&) noexcept 
bool  operator== (const BlockIndices &b) const 
void  swap (BlockIndices &b) 
std::size_t  memory_consumption () const 
Size information  
unsigned int  size () const 
size_type  total_size () const 
size_type  block_size (const unsigned int i) const 
std::string  to_string () const 
Index conversion  
Functions in this group assume an object, which was created after sorting by block, such that each block forms a set of consecutive indices in the object. If applied to other objects, the numbers obtained from these functions are meaningless.  
std::pair< unsigned int, size_type >  global_to_local (const size_type i) const 
size_type  local_to_global (const unsigned int block, const size_type index) const 
size_type  block_start (const unsigned int i) const 
Public Member Functions inherited from Subscriptor  
Subscriptor ()  
Subscriptor (const Subscriptor &)  
Subscriptor (Subscriptor &&) noexcept  
virtual  ~Subscriptor () 
Subscriptor &  operator= (const Subscriptor &) 
Subscriptor &  operator= (Subscriptor &&) noexcept 
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) 
Private Attributes  
unsigned int  n_blocks 
std::vector< size_type >  start_indices 
Related Functions  
(Note that these are not member functions.)  
void  swap (BlockIndices &u, BlockIndices &v) 
Additional Inherited Members  
Static Public Member Functions inherited from Subscriptor  
static ::ExceptionBase &  ExcInUse (int arg1, std::string arg2, std::string arg3) 
static ::ExceptionBase &  ExcNoSubscriber (std::string arg1, std::string arg2) 
BlockIndices represents a range of indices (such as the range \([0,N)\) of valid indices for elements of a vector) and how this one range is broken down into smaller but contiguous "blocks" (such as the velocity and pressure parts of a solution vector). In particular, it provides the ability to translate between global indices and the indices within a block. This class is used, for example, in the BlockVector, BlockSparsityPattern, and BlockMatrixBase classes.
The information that can be obtained from this class falls into two groups. First, it is possible to query the global size of the index space (through the total_size() member function), and the number of blocks and their sizes (via size() and the block_size() functions).
Secondly, this class manages the conversion of global indices to the local indices within this block, and the other way around. This is required, for example, when you address a global element in a block vector and want to know within which block this is, and which index within this block it corresponds to. It is also useful if a matrix is composed of several blocks, where you have to translate global row and column indices to local ones.
Definition at line 60 of file block_indices.h.
Declare the type for container size.
Definition at line 66 of file block_indices.h.

inline 
Default constructor. Initialize for zero blocks.
Definition at line 284 of file block_indices.h.

inline 
Constructor. Initialize the number of entries in each block i
as block_sizes[i]
. The number of blocks will be the size of block_sizes
.
Definition at line 302 of file block_indices.h.

inlinenoexcept 
Move constructor. Initialize a new object by stealing the internal data of another BlockIndices object.
Definition at line 311 of file block_indices.h.

default 
Copy constructor.

inlineexplicit 
Specialized constructor for a structure with blocks of equal size.
Definition at line 291 of file block_indices.h.

inline 
Reinitialize the number of blocks and assign each block the same number of elements.
Definition at line 260 of file block_indices.h.

inline 
Reinitialize the number of indices within each block from the given argument. The number of blocks will be adjusted to the size of block_sizes
and the size of block i
is set to block_sizes[i]
.
Definition at line 271 of file block_indices.h.

inline 
Add another block of given size to the end of the block structure.
Definition at line 322 of file block_indices.h.

inline 
Number of blocks in index field.
Definition at line 358 of file block_indices.h.

inline 
Return the total number of indices accumulated over all blocks, that is, the dimension of the vector space of the block vector.
Definition at line 366 of file block_indices.h.

inline 
The size of the ith
block.
Definition at line 376 of file block_indices.h.

inline 
String representation of the block sizes. The output is of the form [nb>b1,b2,b3s]
, where nb
is n_blocks(), s
is total_size() and b1
etc. are the values returned by block_size() for each of the blocks.
Definition at line 385 of file block_indices.h.

inline 
Return the block and the index within that block for the global index i
. The first element of the pair is the block, the second the index within it.
Definition at line 331 of file block_indices.h.

inline 
Return the global index of index
in block block
.
Definition at line 345 of file block_indices.h.

inline 
The start index of the ith block.
Definition at line 401 of file block_indices.h.

inline 
Copy operator.
Definition at line 410 of file block_indices.h.

inlinenoexcept 
Move assignment operator. Move another BlockIndices object onto the current one by transferring its contents.
Definition at line 420 of file block_indices.h.

inline 
Compare whether two objects are the same, i.e. whether the number of blocks and the sizes of all blocks are equal.
Definition at line 434 of file block_indices.h.

inline 
Swap the contents of these two objects.
Definition at line 449 of file block_indices.h.

inline 
Determine an estimate for the memory consumption (in bytes) of this object.
Definition at line 458 of file block_indices.h.

related 
Global function swap
which overloads the default implementation of the C++ standard library which uses a temporary object. The function simply exchanges the data of the two objects.
Definition at line 477 of file block_indices.h.

private 
Number of blocks. While this value could be obtained through start_indices.size()1
, we cache this value for faster access.
Definition at line 222 of file block_indices.h.

private 
Global starting index of each vector. The last and redundant value is the total number of entries.
Definition at line 228 of file block_indices.h.