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Encapsulate access to the values an iterator points to. More...
#include <vigra/accessor.hxx>
Public Types | |
typedef VALUETYPE | value_type |
Public Member Functions | |
template<class ITERATOR> | |
VALUETYPE | operator() (ITERATOR const &i) const |
template<class ITERATOR, class OFFSET> | |
VALUETYPE | operator() (ITERATOR const &i, OFFSET const &diff) const |
template<class V, class ITERATOR> | |
void | set (V value, ITERATOR const &i) const |
template<class V, class ITERATOR, class OFFSET> | |
void | set (V value, ITERATOR const &i, OFFSET const &diff) const |
Encapsulate access to the values an iterator points to.
StandardValueAccessor is a trivial accessor that simply encapsulates the iterator's operator*() and operator[]() in its read and write functions. It passes its arguments by value. If the iterator returns its items by reference (such as ImageIterator), you can also use StandardAccessor. These 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 appropriate.
#include <vigra/accessor.hxx>
Namespace: vigra
typedef VALUETYPE value_type |
the value_type
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 -> integral this includes rounding and clipping.
VALUETYPE operator() | ( | ITERATOR const & | i, |
OFFSET 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 -> integral this includes rounding and clipping.
void set | ( | V | value, |
ITERATOR const & | i ) const |
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 -> integral this includes rounding and clipping.
void set | ( | V | value, |
ITERATOR const & | i, | ||
OFFSET const & | diff ) const |
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 -> integral this includes rounding and clipping.
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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