StandardAccessor< 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 const &	operator() (ITERATOR const &i) const
template<class ITERATOR , class OFFSET >
VALUETYPE const &	operator() (ITERATOR const &i, OFFSET const &diff) const
template<class V , class ITERATOR >
void	set (V const &value, ITERATOR const &i) const
template<class V , class ITERATOR , class OFFSET >
void	set (V const &value, ITERATOR const &i, OFFSET 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 appropriate.

#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

)

const

read the current data item

VALUETYPE const& operator()	(	ITERATOR const &	i,
		OFFSET const &	diff
	)		const

read the data item at an offset (can be 1D or 2D or higher order difference).

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 -> integral this includes rounding and clipping.

void set	(	V const &	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.

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The documentation for this class was generated from the following file:

• vigra/accessor.hxx