nth_channel_deref_fn< SrcP > Struct Template Reference

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

#include <image_view_factory.hpp>

Public Types
using	const_t = nth_channel_deref_fn< const_ref_t >
using	value_type = typename pixel_value_type< channel_t, gray_layout_t >::type
using	const_reference = typename pixel_reference_type< channel_t, gray_layout_t, false, false >::type
using	argument_type = SrcP
using	reference = mp11::mp_if_c< is_mutable, ref_t, value_type >
using	result_type = reference

Public Member Functions
	nth_channel_deref_fn (int n=0)
template<typename P >
	nth_channel_deref_fn (const nth_channel_deref_fn< P > &d)
auto	operator() (argument_type srcP) const -> result_type

Public Attributes
int	_n

Static Public Attributes
static constexpr bool	is_mutable

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)

Member Data Documentation

is_mutable

constexpr bool is_mutable

staticconstexpr

Initial value:

=
            pixel_is_reference<SrcP>::value && pixel_reference_is_mutable<SrcP>::value

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

• image_view_factory.hpp