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StandardAccessor [Data Accessors] |
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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, class DIFFERENCE> | |
VALUETYPE const & | operator() (ITERATOR const &i, DIFFERENCE const &diff) const |
template<class ITERATOR> | |
VALUETYPE const & | operator() (ITERATOR const &i) const |
template<class V, class ITERATOR, class DIFFERENCE> | |
void | set (V const &value, ITERATOR const &i, DIFFERENCE const &diff) const |
template<class V, class ITERATOR> | |
void | set (V const &value, ITERATOR const &i) const |
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
typedef VALUETYPE value_type |
the value_type
template<class ITERATOR, class DIFFERENCE> | ||||
VALUETYPE const& operator() | ( | ITERATOR const & | i, | |
DIFFERENCE const & | diff | |||
) | const |
read the data item at an offset (can be 1D or 2D or higher order difference).
template<class ITERATOR> | |||||
VALUETYPE const& operator() | ( | ITERATOR const & | i | ) | const |
read the current data item
template<class V, class ITERATOR, class DIFFERENCE> | ||||
void set | ( | V const & | value, | |
ITERATOR const & | i, | |||
DIFFERENCE 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 -> intergral this includes rounding and clipping.
template<class V, class ITERATOR> | ||||
void set | ( | V const & | 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 -> intergral this includes rounding and clipping.
© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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