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// $Id: petsc_block_vector.h 30036 2013-07-18 16:55:32Z maier $
//
// Copyright (C) 2004 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__petsc_block_vector_h
#define __deal2__petsc_block_vector_h
#include <deal.II/base/config.h>
#ifdef DEAL_II_WITH_PETSC
# include <deal.II/lac/petsc_vector.h>
# include <deal.II/lac/petsc_parallel_block_vector.h>
# include <deal.II/lac/block_indices.h>
# include <deal.II/lac/block_vector_base.h>
# include <deal.II/lac/exceptions.h>
DEAL_II_NAMESPACE_OPEN
namespace PETScWrappers
{
/*! @addtogroup PETScWrappers
*@{
*/
/**
* An implementation of block vectors based on the vector class implemented in
* PETScWrappers. While the base class provides for most of the interface,
* this class handles the actual allocation of vectors and provides functions
* that are specific to the underlying vector type.
*
* @ingroup Vectors
* @see @ref GlossBlockLA "Block (linear algebra)"
* @author Wolfgang Bangerth, 2004
*/
class BlockVector : public BlockVectorBase<Vector>
{
public:
/**
* Typedef the base class for simpler
* access to its own typedefs.
*/
typedef BlockVectorBase<Vector> BaseClass;
/**
* Typedef the type of the underlying
* vector.
*/
typedef BaseClass::BlockType BlockType;
/**
* Import the typedefs from the base
* class.
*/
typedef BaseClass::value_type value_type;
typedef BaseClass::pointer pointer;
typedef BaseClass::const_pointer const_pointer;
typedef BaseClass::reference reference;
typedef BaseClass::const_reference const_reference;
typedef BaseClass::size_type size_type;
typedef BaseClass::iterator iterator;
typedef BaseClass::const_iterator const_iterator;
/**
* Constructor. There are three
* ways to use this
* constructor. First, without
* any arguments, it generates
* an object with no
* blocks. Given one argument,
* it initializes <tt>num_blocks</tt>
* blocks, but these blocks have
* size zero. The third variant
* finally initializes all
* blocks to the same size
* <tt>block_size</tt>.
*
* Confer the other constructor
* further down if you intend to
* use blocks of different
* sizes.
*/
explicit BlockVector (const unsigned int num_blocks = 0,
const size_type block_size = 0);
/**
* Copy-Constructor. Dimension set to
* that of V, all components are copied
* from V
*/
BlockVector (const BlockVector &V);
/**
* Copy-constructor: copy the values
* from a PETSc wrapper parallel block
* vector class.
*
*
* Note that due to the communication
* model of MPI, @em all processes have
* to actually perform this operation,
* even if they do not use the
* result. It is not sufficient if only
* one processor tries to copy the
* elements from the other processors
* over to its own process space.
*/
explicit BlockVector (const MPI::BlockVector &v);
/**
* Constructor. Set the number of
* blocks to <tt>n.size()</tt> and
* initialize each block with
* <tt>n[i]</tt> zero elements.
*/
BlockVector (const std::vector<size_type> &n);
/**
* Constructor. Set the number of
* blocks to
* <tt>n.size()</tt>. Initialize the
* vector with the elements
* pointed to by the range of
* iterators given as second and
* third argument. Apart from the
* first argument, this
* constructor is in complete
* analogy to the respective
* constructor of the
* <tt>std::vector</tt> class, but the
* first argument is needed in
* order to know how to subdivide
* the block vector into
* different blocks.
*/
template <typename InputIterator>
BlockVector (const std::vector<size_type> &n,
const InputIterator first,
const InputIterator end);
/**
* Destructor. Clears memory
*/
~BlockVector ();
/**
* Copy operator: fill all components of
* the vector with the given scalar
* value.
*/
BlockVector &operator = (const value_type s);
/**
* Copy operator for arguments of the
* same type.
*/
BlockVector &
operator= (const BlockVector &V);
/**
* Copy all the elements of the
* parallel block vector @p v into this
* local vector. Note that due to the
* communication model of MPI, @em all
* processes have to actually perform
* this operation, even if they do not
* use the result. It is not sufficient
* if only one processor tries to copy
* the elements from the other
* processors over to its own process
* space.
*/
BlockVector &
operator = (const MPI::BlockVector &v);
/**
* Reinitialize the BlockVector to
* contain <tt>num_blocks</tt> blocks of
* size <tt>block_size</tt> each.
*
* If <tt>fast==false</tt>, the vector
* is filled with zeros.
*/
void reinit (const unsigned int num_blocks,
const size_type block_size,
const bool fast = false);
/**
* Reinitialize the BlockVector such
* that it contains
* <tt>block_sizes.size()</tt>
* blocks. Each block is reinitialized
* to dimension
* <tt>block_sizes[i]</tt>.
*
* If the number of blocks is the
* same as before this function
* was called, all vectors remain
* the same and reinit() is
* called for each vector.
*
* If <tt>fast==false</tt>, the vector
* is filled with zeros.
*
* Note that you must call this
* (or the other reinit()
* functions) function, rather
* than calling the reinit()
* functions of an individual
* block, to allow the block
* vector to update its caches of
* vector sizes. If you call
* reinit() on one of the
* blocks, then subsequent
* actions on this object may
* yield unpredictable results
* since they may be routed to
* the wrong block.
*/
void reinit (const std::vector<size_type> &N,
const bool fast=false);
/**
* Change the dimension to that
* of the vector <tt>V</tt>. The same
* applies as for the other
* reinit() function.
*
* The elements of <tt>V</tt> are not
* copied, i.e. this function is
* the same as calling <tt>reinit
* (V.size(), fast)</tt>.
*
* Note that you must call this
* (or the other reinit()
* functions) function, rather
* than calling the reinit()
* functions of an individual
* block, to allow the block
* vector to update its caches of
* vector sizes. If you call
* reinit() of one of the
* blocks, then subsequent
* actions of this object may
* yield unpredictable results
* since they may be routed to
* the wrong block.
*/
void reinit (const BlockVector &V,
const bool fast=false);
/**
* Change the number of blocks to
* <tt>num_blocks</tt>. The individual
* blocks will get initialized with
* zero size, so it is assumed that
* the user resizes the
* individual blocks by herself
* in an appropriate way, and
* calls <tt>collect_sizes</tt>
* afterwards.
*/
void reinit (const unsigned int num_blocks);
/**
* Swap the contents of this
* vector and the other vector
* <tt>v</tt>. One could do this
* operation with a temporary
* variable and copying over the
* data elements, but this
* function is significantly more
* efficient since it only swaps
* the pointers to the data of
* the two vectors and therefore
* does not need to allocate
* temporary storage and move
* data around.
*
* Limitation: right now this
* function only works if both
* vectors have the same number
* of blocks. If needed, the
* numbers of blocks should be
* exchanged, too.
*
* This function is analog to the
* the swap() function of all C++
* standard containers. Also,
* there is a global function
* swap(u,v) that simply calls
* <tt>u.swap(v)</tt>, again in analogy
* to standard functions.
*/
void swap (BlockVector &v);
/**
* Print to a stream.
*/
void print (std::ostream &out,
const unsigned int precision = 3,
const bool scientific = true,
const bool across = true) const;
/** @addtogroup Exceptions
* @{ */
/**
* Exception
*/
DeclException0 (ExcIteratorRangeDoesNotMatchVectorSize);
///@}
};
/*@}*/
/*----------------------- Inline functions ----------------------------------*/
inline
BlockVector::BlockVector (const unsigned int n_blocks,
const size_type block_size)
{
reinit (n_blocks, block_size);
}
inline
BlockVector::BlockVector (const std::vector<size_type> &n)
{
reinit (n, false);
}
inline
BlockVector::BlockVector (const BlockVector &v)
:
BlockVectorBase<Vector > ()
{
this->components.resize (v.n_blocks());
block_indices = v.block_indices;
for (unsigned int i=0; i<this->n_blocks(); ++i)
this->components[i] = v.components[i];
}
inline
BlockVector::BlockVector (const MPI::BlockVector &v)
:
BlockVectorBase<Vector > ()
{
this->components.resize (v.get_block_indices().size());
block_indices = v.get_block_indices();
for (unsigned int i=0; i<this->n_blocks(); ++i)
this->components[i] = v.block(i);
}
template <typename InputIterator>
BlockVector::BlockVector (const std::vector<size_type> &n,
const InputIterator first,
const InputIterator end)
{
// first set sizes of blocks, but
// don't initialize them as we will
// copy elements soon
reinit (n, true);
InputIterator start = first;
for (unsigned int b=0; b<n.size(); ++b)
{
InputIterator end = start;
std::advance (end, static_cast<signed int>(n[b]));
for (size_type i=0; i<n[b]; ++i, ++start)
this->block(b)(i) = *start;
}
Assert (start == end, ExcIteratorRangeDoesNotMatchVectorSize());
}
inline
BlockVector &
BlockVector::operator = (const value_type s)
{
BaseClass::operator = (s);
return *this;
}
inline
BlockVector &
BlockVector::operator = (const BlockVector &v)
{
BaseClass::operator = (v);
return *this;
}
inline
BlockVector &
BlockVector::operator = (const MPI::BlockVector &v)
{
BaseClass::operator = (v);
return *this;
}
inline
BlockVector::~BlockVector ()
{}
inline
void
BlockVector::reinit (const unsigned int n_bl,
const size_type bl_sz,
const bool fast)
{
std::vector<size_type> n(n_bl, bl_sz);
reinit(n, fast);
}
inline
void
BlockVector::reinit (const std::vector<size_type> &n,
const bool fast)
{
block_indices.reinit (n);
if (this->components.size() != this->n_blocks())
this->components.resize(this->n_blocks());
for (unsigned int i=0; i<this->n_blocks(); ++i)
this->components[i].reinit(n[i], fast);
}
inline
void
BlockVector::reinit (const BlockVector &v,
const bool fast)
{
block_indices = v.get_block_indices();
if (this->components.size() != this->n_blocks())
this->components.resize(this->n_blocks());
for (unsigned int i=0; i<this->n_blocks(); ++i)
block(i).reinit(v.block(i), fast);
}
inline
void
BlockVector::reinit (const unsigned int num_blocks)
{
reinit (num_blocks, 0, true);
}
inline
void
BlockVector::swap (BlockVector &v)
{
Assert (this->n_blocks() == v.n_blocks(),
ExcDimensionMismatch(this->n_blocks(), v.n_blocks()));
for (unsigned int i=0; i<this->n_blocks(); ++i)
this->components[i].swap (v.components[i]);
::dealii::swap (this->block_indices, v.block_indices);
}
inline
void
BlockVector::print (std::ostream &out,
const unsigned int precision,
const bool scientific,
const bool across) const
{
for (unsigned int i=0; i<this->n_blocks(); ++i)
{
if (across)
out << 'C' << i << ':';
else
out << "Component " << i << std::endl;
this->components[i].print(out, precision, scientific, across);
}
}
/**
* Global function which overloads the default implementation
* of the C++ standard library which uses a temporary object. The
* function simply exchanges the data of the two vectors.
*
* @relates PETScWrappers::BlockVector
* @author Wolfgang Bangerth, 2000
*/
inline
void swap (BlockVector &u,
BlockVector &v)
{
u.swap (v);
}
}
DEAL_II_NAMESPACE_CLOSE
#endif // DEAL_II_WITH_PETSC
#endif
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