delegate_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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#ifndef ETL_DELEGATE_SERVICE_INCLUDED
#define ETL_DELEGATE_SERVICE_INCLUDED
 
#include "platform.h"
#include "nullptr.h"
#include "static_assert.h"
#include "delegate.h"
#include "array.h"
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
#if ETL_USING_CPP11 && !defined(ETL_DELEGATE_FORCE_CPP03_IMPLEMENTATION)
  template <size_t Range, 
            size_t Offset = 0U,
            const etl::delegate<void(size_t)>* Delegates = nullptr>
  class delegate_service
  {
  public:
 
    typedef etl::delegate<void(size_t)> delegate_type;
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void call() const
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset,          "Callback Id out of range");
 
      Delegates[Id - Offset](Id);
    }
 
    //*************************************************************************
    //*************************************************************************
    void call(size_t id) const
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        // Call the delegate with the specified Id.
        Delegates[id - Offset](id);
      }
      else
      {
        // Call the 'unhandled' delegate.
        Delegates[Range](id);
      }
    }
  };
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <size_t Range, 
            size_t Offset>
#if ETL_USING_CPP11 && !defined(ETL_DELEGATE_FORCE_CPP03_IMPLEMENTATION)
  class delegate_service<Range, Offset, nullptr>
#else
  class delegate_service
#endif
  {
  public:
 
    typedef etl::delegate<void(size_t)> delegate_type;
 
    //*************************************************************************
    //*************************************************************************
    delegate_service()
    {
      delegate_type default_delegate = delegate_type::create<delegate_service<Range, Offset>, &delegate_service<Range, Offset>::unhandled>(*this);
 
      lookup.fill(default_delegate);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void register_delegate(delegate_type 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_delegate(size_t id, delegate_type callback)
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        lookup[id - Offset] = callback;
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    void register_unhandled_delegate(delegate_type callback)
    {
      unhandled_delegate = callback;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void call() const
    {
      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 call(const size_t id) const
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        // Call the delegate with the specified Id.
        lookup[id - Offset](id);
      }
      else
      {
        // Call the 'unhandled' delegate.
        unhandled(id);
      }
    }
 
  private:
 
    //*************************************************************************
    //*************************************************************************
    void unhandled(size_t id) const
    {
      if (unhandled_delegate.is_valid())
      {
        unhandled_delegate(id);
      }
    }
 
    delegate_type unhandled_delegate;
 
    etl::array<delegate_type, Range> lookup;
  };
}
 
#endif