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

#include <Thyra_DetachedVectorView.hpp>

Public Member Functions
	DetachedVectorView (const Teuchos::RCP< VectorBase< Scalar > > &v, const Range1D &rng=Range1D(), const bool forceUnitStride=false)
	Construct an explicit mutable (non-const) view of a subset of elements. More...

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

const RTOpPack::SubVectorView < 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...

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...

Scalar &	operator[] (Teuchos_Ordinal i) const
	Zero-based indexing: Preconditions: `values()!=NULL && (0 <= i < subDim()-1)`. More...

Scalar &	operator() (Teuchos_Ordinal i) const
	Zero-based indexing: Preconditions: `values()!=NULL && (0 <= i < subDim()-1)`. More...

Detailed Description

template<class Scalar>
class Thyra::DetachedVectorView< Scalar >

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

This utility class makes it easy to explicitly access a contiguous subset of elements in any VectorBase object and change the 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 only read the elements in a VectorBase object then one should use the utility class ConstDetachedVectorView.

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

Definition at line 222 of file Thyra_DetachedVectorView.hpp.

Constructor & Destructor Documentation

template<class Scalar>

Thyra::DetachedVectorView< Scalar >::DetachedVectorView	(	const Teuchos::RCP< VectorBase< Scalar > > &	v,
		const Range1D &	rng = `Range1D()`,
		const bool	forceUnitStride = `false`
	)

inline

Construct an explicit mutable (non-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. The elements in `v` are not guaranteed to be updated 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:

this->sv() returns the created view
this->globalOffset()==rng.lbound()
this->subDim()==rng.size()
this->values() returns a pointer to a Scalar array
this->stride() returns the stride between the elements pointed it in this->values()
[forceUnitStride==true] this->stride()==1

Definition at line 261 of file Thyra_DetachedVectorView.hpp.