Thyra  Version of the Day
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
Public Member Functions | List of all members
Thyra::ConstDetachedVectorView< Scalar > Class Template Reference

Create an explicit non-mutable (const) view of a VectorBase object. More...

#include <Thyra_DetachedVectorView.hpp>

Public Member Functions

 ConstDetachedVectorView (const Teuchos::RCP< const VectorBase< Scalar > > &v, const Range1D &rng=Range1D(), const bool forceUnitStride=false)
 Construct an explicit non-mutable (const) view of a subset of elements. More...
 
 ConstDetachedVectorView (const VectorBase< Scalar > &v, const Range1D &rng=Range1D(), const bool forceUnitStride=false)
 Construct an explicit non-mutable (const) view of a subset of elements. More...
 
 ~ConstDetachedVectorView ()
 Free the explicit view on the VectorBase object v passed to ConstDetachedVectorView(). More...
 
const
RTOpPack::ConstSubVectorView
< Scalar > & 
sv () const
 Returns the explicit view as an RTOpPack::ConstSubVectorView<Scalar> object. More...
 
Teuchos_Ordinal globalOffset () const
 Returns the global offset for the explicit view. More...
 
Teuchos_Ordinal subDim () const
 Returns the dimension of the explicit view. More...
 
const Scalar * values () const
 Return a pointer to a Scalar array containing the explicit view. More...
 
ptrdiff_t stride () const
 Return the stride between elements in the array returned from this->values(). More...
 
const Scalar & operator[] (Teuchos_Ordinal i) const
 Zero-based indexing: Preconditions: values()!=NULL && (0 <= i < subDim()-1). More...
 
const Scalar & operator() (Teuchos_Ordinal i) const
 Zero-based indexing: Preconditions: values()!=NULL && (0 <= i < subDim()-1). More...
 

Detailed Description

template<class Scalar>
class Thyra::ConstDetachedVectorView< Scalar >

Create an explicit non-mutable (const) view of a VectorBase object.

This utility class makes it easy to explicitly access a contiguous subset of elements in any const VectorBase object.

Warning! Creating an explicit view of an arbitrary VectorBase object may be a very expensive operation (such as with distributed-memory vectors) and should only be done in special cases (such as when the vector is an in-core vector). There several specialized use cases where creating these types of explicit views are necessary but in most cases this should not be done.

If one wants to modify the elements in a VectorBase object then one should use the utility class DetachedVectorView.

The default constructor, copy constructor and assignment operators are not allowed.

Definition at line 40 of file Thyra_DetachedVectorView.hpp.

Constructor & Destructor Documentation

template<class Scalar>
Thyra::ConstDetachedVectorView< Scalar >::ConstDetachedVectorView ( const Teuchos::RCP< const VectorBase< Scalar > > &  v,
const Range1D rng = Range1D(),
const bool  forceUnitStride = false 
)
inline

Construct an explicit non-mutable (const) view of a subset of elements.

Parameters
v[in] The vector that a view will be taken. This object must be maintained until *this is destroyed.
rng[in] the range of element indices that the explicit view will be taken.
forceUnitStride[in] If true then the view will have unit stride.

Preconditions:

  • [rng.full_range()==false] rng.ubound() < v.space()->dim()

Postconditions:

Definition at line 78 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
Thyra::ConstDetachedVectorView< Scalar >::ConstDetachedVectorView ( const VectorBase< Scalar > &  v,
const Range1D rng = Range1D(),
const bool  forceUnitStride = false 
)
inline

Construct an explicit non-mutable (const) view of a subset of elements.

Parameters
v[in] The vector that a view will be taken. This object must be maintained until *this is destroyed.
rng[in] the range of element indices that the explicit view will be taken.
forceUnitStride[in] If true then the view will have unit stride.

Preconditions:

  • [rng.full_range()==false] rng.ubound() < v.space()->dim()

Postconditions:

Definition at line 121 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
Thyra::ConstDetachedVectorView< Scalar >::~ConstDetachedVectorView ( )
inline

Free the explicit view on the VectorBase object v passed to ConstDetachedVectorView().

Definition at line 130 of file Thyra_DetachedVectorView.hpp.

Member Function Documentation

template<class Scalar>
const RTOpPack::ConstSubVectorView<Scalar>& Thyra::ConstDetachedVectorView< Scalar >::sv ( ) const
inline

Returns the explicit view as an RTOpPack::ConstSubVectorView<Scalar> object.

Definition at line 140 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
Teuchos_Ordinal Thyra::ConstDetachedVectorView< Scalar >::globalOffset ( ) const
inline

Returns the global offset for the explicit view.

Definition at line 143 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
Teuchos_Ordinal Thyra::ConstDetachedVectorView< Scalar >::subDim ( ) const
inline

Returns the dimension of the explicit view.

Definition at line 146 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
const Scalar* Thyra::ConstDetachedVectorView< Scalar >::values ( ) const
inline

Return a pointer to a Scalar array containing the explicit view.

Definition at line 151 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
ptrdiff_t Thyra::ConstDetachedVectorView< Scalar >::stride ( ) const
inline

Return the stride between elements in the array returned from this->values().

Definition at line 156 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
const Scalar& Thyra::ConstDetachedVectorView< Scalar >::operator[] ( Teuchos_Ordinal  i) const
inline

Zero-based indexing: Preconditions: values()!=NULL && (0 <= i < subDim()-1).

Definition at line 161 of file Thyra_DetachedVectorView.hpp.

template<class Scalar>
const Scalar& Thyra::ConstDetachedVectorView< Scalar >::operator() ( Teuchos_Ordinal  i) const
inline

Zero-based indexing: Preconditions: values()!=NULL && (0 <= i < subDim()-1).

Definition at line 166 of file Thyra_DetachedVectorView.hpp.


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