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 |
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)
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staticconstexpr |