IsBlockMatrix< MatrixType > Struct Template Reference

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

Classes
struct	no_type
struct	yes_type

Static Public Attributes
static const bool	value

Static Private Member Functions
template<typename T >
static yes_type	check_for_block_matrix (const BlockMatrixBase< T > *)
template<typename T >
static yes_type	check_for_block_matrix (const BlockSparsityPatternBase< T > *)
template<typename T >
static yes_type	check_for_block_matrix (const BlockSparseMatrixEZ< T > *)
static no_type	check_for_block_matrix (...)

Detailed Description

template<typename MatrixType>
struct IsBlockMatrix< MatrixType >

A class that can be used to determine whether a given type is a block matrix type or not. For example,

IsBlockMatrix<SparseMatrix<number> >::value

has the value false, whereas

IsBlockMatrix<BlockSparseMatrix<number> >::value

is true. This is sometimes useful in template contexts where we may want to do things differently depending on whether a template type denotes a regular or a block matrix type.

See also

Block (linear algebra)

Author

Wolfgang Bangerth, 2009

Definition at line 1928 of file affine_constraints.h.

Member Function Documentation

check_for_block_matrix() [1/4]

template<typename MatrixType >

template<typename T >

static yes_type IsBlockMatrix< MatrixType >::check_for_block_matrix ( const BlockMatrixBase< T > *  )

staticprivate

Overload returning true if the class is derived from BlockMatrixBase, which is what block matrices do (with the exception of BlockSparseMatrixEZ).

check_for_block_matrix() [2/4]

template<typename MatrixType >

template<typename T >

static yes_type IsBlockMatrix< MatrixType >::check_for_block_matrix ( const BlockSparsityPatternBase< T > *  )

staticprivate

Overload returning true if the class is derived from BlockSparsityPatternBase, which is what block sparsity patterns do.

check_for_block_matrix() [3/4]

template<typename MatrixType >

template<typename T >

static yes_type IsBlockMatrix< MatrixType >::check_for_block_matrix ( const BlockSparseMatrixEZ< T > *  )

staticprivate

Overload for BlockSparseMatrixEZ, which is the only block matrix not derived from BlockMatrixBase at the time of writing this class.

check_for_block_matrix() [4/4]

template<typename MatrixType >

static no_type IsBlockMatrix< MatrixType >::check_for_block_matrix (   ... )

staticprivate

Catch all for all other potential matrix types that are not block matrices.

Member Data Documentation

value

template<typename MatrixType >

const bool IsBlockMatrix< MatrixType >::value

static

Initial value:

=
    (sizeof(check_for_block_matrix(static_cast<MatrixType *>(nullptr))) ==
     sizeof(yes_type))

A statically computable value that indicates whether the template argument to this class is a block matrix (in fact whether the type is derived from BlockMatrixBase<T>).

Definition at line 1978 of file affine_constraints.h.

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

• include/deal.II/lac/affine_constraints.h