VectorElementAccessor< ACCESSOR > Class Template Reference

Accessor for one component of a vector. More...

#include <vigra/accessor.hxx>

Public Types
typedef ACCESSOR::component_type	value_type

Public Member Functions
template<class ITERATOR >
value_type const &	operator() (ITERATOR const &i) const
template<class ITERATOR , class OFFSET >
value_type 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
void	setIndex (int i)
	VectorElementAccessor (int index, ACCESSOR a=ACCESSOR())

Detailed Description

template<class ACCESSOR>
class vigra::VectorElementAccessor< ACCESSOR >

Accessor for one component of a vector.

This works like VectorComponentAccessor, only the template parameters differ: Here, we need a vector accessor type , whereas VectorComponentAccessor requires a vector type.

Usage:

vigra::BRGBImage image(w,h);

// init red channel with 255
initImage(destImageRange(image, 
                         VectorElementAccessor<vigra::BRGBImage::Accessor>(0)),
          255);

#include <vigra/accessor.hxx>
Namespace: vigra

Member Typedef Documentation

typedef ACCESSOR::component_type value_type

the value_type

Constructor & Destructor Documentation

VectorElementAccessor	(	int	index,
		ACCESSOR	a = ACCESSOR()
	)

determine the component to be accessed

Member Function Documentation

value_type const& operator()

(

ITERATOR const &

i

)

const

read the current data item

value_type 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 value_type. 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 value_type. In case of a conversion floating point -> integral this includes rounding and clipping.

void setIndex

(

int

i

)

Reset the index to the given number.

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

• vigra/accessor.hxx