Generic Image Library: nth_channel_deref_fn Struct Template Reference

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# nth_channel_deref_fn Struct Template Reference
[Models]

`#include <image_view_factory.hpp>`

List of all members.

## Detailed Description

### template<typename SrcP>
struct boost::gil::detail::nth_channel_deref_fn< SrcP >

Function object that returns a grayscale reference of the N-th channel of a given reference. Models: PixelDereferenceAdaptorConcept.

If the input is a pixel value or constant reference, the function object is immutable. Otherwise it is mutable (and returns non-const reference to the n-th channel).

## Public Types

typedef nth_channel_deref_fn < const_ref_t > | const_t
typedef pixel_value_type < channel_t, gray_layout_t > ::type | value_type
typedef pixel_reference_type < channel_t, gray_layout_t, false, false >::type | const_reference
typedef SrcP | argument_type
typedef mpl::if_c< is_mutable, ref_t, value_type >::type | reference
typedef reference | result_type

## Public Member Functions

| BOOST_STATIC_CONSTANT (bool, is_mutable=pixel_is_reference< SrcP >::value &&pixel_reference_is_mutable< SrcP >::value)
| nth_channel_deref_fn (int n=0)
template<typename P>
| nth_channel_deref_fn (const nth_channel_deref_fn< P > &d)
result_type | operator() (argument_type srcP) const

## Public Attributes

int | _n

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

- image_view_factory.hpp