Data Accessors

Modules
	Accessors for FFTWComplex
	Accessors for OpenCL types
	Accessors for RGBValue

Classes
class	BilinearInterpolatingAccessor< ACCESSOR, VALUETYPE >
	Bilinear interpolation at non-integer positions. More...
class	cl_charNAccessor_COMP
class	FFTWRealAccessor< Real >
class	MultiImageAccessor2< Iter1, Acc1, Iter2, Acc2 >
	Access two images simultaneously. More...
class	RGBAccessor< T >
class	SequenceAccessor< SEQUENCE >
	Accessor for items that are STL compatible sequences. More...
class	StandardAccessor< VALUETYPE >
	Encapsulate access to the values an iterator points to. More...
class	StandardConstAccessor< VALUETYPE >
	Encapsulate read access to the values an iterator points to. More...
class	StandardConstValueAccessor< VALUETYPE >
	Encapsulate access to the values an iterator points to. More...
class	StandardValueAccessor< VALUETYPE >
	Encapsulate access to the values an iterator points to. More...
class	VectorAccessor< VECTOR >
	Accessor for items that are STL compatible vectors. More...
class	VectorComponentAccessor< VECTORTYPE >
	Accessor for one component of a vector. More...
class	VectorComponentValueAccessor< VECTORTYPE >
	Accessor for one component of a vector. More...
class	VectorElementAccessor< ACCESSOR >
	Accessor for one component of a vector. More...

Detailed Description

Basic templates to encapsulate access to the data of an iterator.

Data accessors are used to allow for flexible access to the data an iterator points to. When we access the data directly, we are bound to what operator*() returns, if this method exists at all. Encapsulating access in an accessor enables a better decoupling of data structures and algorithms. This paper contains a detailed description of the concept. Here is a brief list of the basic accessor requirements:

Operation	Result	Semantics
accessor(iter)	convertible to Accessor::value_type const &	read data at the current position of the iterator
accessor(iter, index)	convertible to Accessor::value_type const &	read data at offset index relative to iterator's current position (random-access iterator only)
accessor.set(value, iter)	void	write data value at the current position of the iterator (mutable iterator only)
accessor.set(value, iter, index)	void	write data value at offset index relative to iterator's current position (mutable random-access iterator only)
Accessor::value_type		type of the data field the accessor refers to
iter is an iterator index has the iterator's index type (Iterator::difference_type) value is convertible to Accessor::value_type const &

The template AccessorTraits<T> can be used to find the default accessor associated with the type T, e.g.

typedef typename AccessorTraits<typename Image::value_type>::default_accessor       Accessor;
typedef typename AccessorTraits<typename Image::value_type>::default_const_accessor ConstAccessor;