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details StandardConstValueAccessor Class Template Reference VIGRA

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

#include "vigra/accessor.hxx"


Public Methods

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

 

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.


VALUETYPE operator() ITERATOR const &    i const [inline]

 

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.


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

© Ullrich Köthe (koethe@informatik.uni-hamburg.de)
Cognitive Systems Group, University of Hamburg, Germany

html generated using doxygen and Python
VIGRA 1.4.0 (21 Dec 2005)