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| StandardAccessor Class Template Reference |
--- | --- | ---

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

`#include "vigra/accessor.hxx"`

## Public Types

typedef VALUETYPE | value_type

## Public Methods

template<class ITERATOR> VALUETYPE const & | operator() (ITERATOR const &i) const
template<class ITERATOR, class DIFFERENCE> VALUETYPE const & | operator() (ITERATOR const &i, DIFFERENCE const &diff) const
template<class V, class ITERATOR> void | set (V const &value, ITERATOR const &i) const
template<class V, class ITERATOR, class DIFFERENCE> void | set (V const &value, ITERATOR const &i, DIFFERENCE const &diff) const

## Detailed Description

### template<class VALUETYPE>
class vigra::StandardAccessor< VALUETYPE >

Encapsulate access to the values an iterator points to.

StandardAccessor is a trivial accessor that simply encapsulates the iterator's operator *() and operator[]() in its read and write functions. It passes its arguments by reference. If you want to return items by value, you must use StandardValueAccessor instead of StandardAccessor. Both accessors have different optimization properties -- StandardAccessor is usually faster for compound pixel types, while StandardValueAccessor is faster for the built-in types.

When a floating point number is assigned by means of an accessor with integral value_type, the value is rounded and clipped as approriate.

#include "vigra/accessor.hxx"
Namespace: vigra

## Member Typedef Documentation

typedef VALUETYPE value_type

| the value_type

## Member Function Documentation

VALUETYPE const& 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).

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

| read the current data item

void set | ( | V const & | value,
|  | ITERATOR const & | i,
|  | DIFFERENCE const & | diff
| ) | const`[inline]`

| Write the data item at an offset (can be 1D or 2D or higher order difference).. The type `V` of the passed in `value` is automatically converted to `VALUETYPE`. In case of a conversion floating point -> intergral this includes rounding and clipping.

void set | ( | V const & | value,
|  | ITERATOR const & | i
| ) | const`[inline]`

| Write the current data item. The type `V` of the passed in `value` 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:

- vigra/accessor.hxx

© Ullrich Köthe (koethe@informatik.uni-hamburg.de) Cognitive Systems Group, University of Hamburg, Germany | html generated using doxygen and Python VIGRA 1.5.0 (7 Dec 2006)