Handle.h

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#pragma once

// -- std includes
#include <functional>
#include <memory>
#include <typeinfo>

// -- MarlinBook includes
#include "marlinmt/book/MemLayout.h"
#include "marlinmt/book/Types.h"

namespace marlinmt {
  namespace book {

    // -- MarlinBook forward declaration
    class BookStore ;
    class MemLayout ;

    template < typename T >
    class BaseHandle {
    protected:
      BaseHandle( std::shared_ptr< MemLayout > mem, std::shared_ptr< T > obj )
        : _mem{std::move( mem )}, _obj{std::move( obj )} {}

      T &get() { return *_obj; }

    public:
      const T &merged() { return *_mem->template merged< T >(); }

    private:
      std::shared_ptr< MemLayout > _mem ;
      std::shared_ptr< T >         _obj ;
    } ;

    template < typename T >
    class Handle : public BaseHandle< T > {
    public:
      Handle( const std::shared_ptr< T >         &obj,
              const std::shared_ptr< MemLayout > &mem )
        : BaseHandle< T >( obj, mem ) {}
    } ;

  } // end namespace book
} // end namespace marlinmt