Represents a unary function object that can be invoked upon dereferencing a pixel iterator.  
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template<typename D>
struct boost::gil::PixelDereferenceAdaptorConcept< D >
Represents a unary function object that can be invoked upon dereferencing a pixel iterator. 
This can perform an arbitrary computation, such as color conversion or table lookup. 
concept PixelDereferenceAdaptorConcept<boost::UnaryFunctionConcept D>
    : DefaultConstructibleConcept<D>, CopyConstructibleConcept<D>, AssignableConcept<D>
{
    typename const_t; where PixelDereferenceAdaptorConcept<const_t>;
    typename value_type; where PixelValueConcept<value_type>;
    typename reference;         
    typename const_reference;   
    static const bool D::is_mutable;
    where Convertible<value_type,result_type>;
};