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StandardConstValueAccessor< VALUETYPE > Class Template Reference
[Data Accessors]

Encapsulate access to the values an iterator points to. More...

#include <vigra/accessor.hxx>

List of all members.

Public Member Functions

template<class ITERATOR , class DIFFERENCE >
VALUETYPE operator() (ITERATOR const &i, DIFFERENCE const &diff) const
template<class ITERATOR >
VALUETYPE operator() (ITERATOR const &i) const

Detailed Description

template<class VALUETYPE>
class vigra::StandardConstValueAccessor< VALUETYPE >

Encapsulate access to the values an iterator points to.

StandardConstValueAccessor is a trivial accessor that simply encapsulates the iterator's operator*() and operator[]() in its read functions. It passes its arguments by value. If the iterator returns its items by reference (such as vigra::ConstImageIterator), you can also use StandardConstAccessor. These accessors have different optimization properties -- StandardConstAccessor is usually faster for compound pixel types, while StandardConstValueAccessor is faster for the built-in types.

When an iterator passes a floating point number to an accessor with integral value_type, the value is rounded and clipped as approriate.

#include <vigra/accessor.hxx>
Namespace: vigra


Member Function Documentation

VALUETYPE operator() ( ITERATOR const &  i  )  const

Read the current data item. The type ITERATOR::reference is automatically converted to VALUETYPE. In case of a conversion floating point -> intergral this includes rounding and clipping.

VALUETYPE operator() ( ITERATOR const &  i,
DIFFERENCE const &  diff 
) const

Read the data item at an offset (can be 1D or 2D or higher order difference). The type ITERATOR::index_reference is automatically converted to VALUETYPE. In case of a conversion floating point -> intergral this includes rounding and clipping.


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

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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VIGRA 1.6.0 (5 Nov 2009)