callback_service.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2019 John Wellbelove
 
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of this software and associated documentation files(the "Software"), to deal
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#ifndef ETL_CALLBACK_SERVICE_INCLUDED
#define ETL_CALLBACK_SERVICE_INCLUDED
 
#include "platform.h"
#include "nullptr.h"
#include "static_assert.h"
#include "function.h"
#include "array.h"
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
  template <size_t Range, size_t Offset = 0U>
  class callback_service
  {
  public:
 
    //*************************************************************************
    //*************************************************************************
    callback_service()
      : unhandled_callback(*this),
        p_unhandled(ETL_NULLPTR)
    {
      lookup.fill(&unhandled_callback);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void register_callback(etl::ifunction<size_t>& callback)
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset,          "Callback Id out of range");
 
      lookup[Id - Offset] = &callback;
    }
 
    //*************************************************************************
    //*************************************************************************
    void register_callback(size_t id, etl::ifunction<size_t>& callback)
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        lookup[id - Offset] = &callback;
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    void register_unhandled_callback(etl::ifunction<size_t>& callback)
    {
      p_unhandled = &callback;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void callback()
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset,          "Callback Id out of range");
 
      (*lookup[Id - Offset])(Id);
    }
 
    //*************************************************************************
    //*************************************************************************
    void callback(size_t id)
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        (*lookup[id - Offset])(id);
      }
      else
      {
        unhandled(id);
      }
    }
 
  private:
 
    //*************************************************************************
    //*************************************************************************
    void unhandled(size_t id)
    {
      if (p_unhandled != ETL_NULLPTR)
      {
        (*p_unhandled)(id);
      }
    }

    etl::function_mp<callback_service<Range, Offset>,
                     size_t,
                     &callback_service<Range, Offset>::unhandled> unhandled_callback;

    etl::ifunction<size_t>* p_unhandled;

    etl::array<etl::ifunction<size_t>*, Range> lookup;
  };
}
 
#endif