[ VIGRA Homepage | Function Index | Class Index | Namespaces | File List | Main Page ]
StandardValueAccessor< VALUETYPE > Class Template Reference |
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 vigra::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) |
html generated using doxygen and Python
|