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Kernel functor requirements:

template<
    typename TAcc = alpaka::IAcc<>>    // Templated on the accelerator type.
struct MyFunctor         
{
    ALPAKA_FCT_ACC                     // Macro marking the function to be executable on all accelerators.
    void operator()(                   // The function / kernel to execute.
        TAcc const & acc,              // The interfaced accelerator implementation.
        ... ) const                  
    {
        ... 
    }
    
    // Class can have members but has to be std::is_trivially_copyable.
    // Classes must not have pointers or references to host memory!
};