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Encapsulate access to the values an iterator points to. More...
#include <vigra/accessor.hxx>
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 |
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 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 appropriate.
#include <vigra/accessor.hxx>
Namespace: vigra
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.
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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