shm_ptr.h

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#ifndef SHM_PTR_H
#define SHM_PTR_H 1

#include "shm_segment.h"

template<typename T>
class shm_ptr
{
 public:
  shm_ptr() { offset = 0; } ;
  shm_ptr( T* rawptr, const shm_segment& seg ) { 
    offset = (long) rawptr - (long)seg.get_base();
  };
 
  T* get( const shm_segment& seg ) const { 
    return ( T * )( offset + (long)( seg.get_base() ) ) ; 
  };
  long off( void ) { return offset ; } ;

  long set( long off ) { return offset = off ; } ;
  void reset( T* rawptr, const shm_segment& seg ) { 
    offset = (long)rawptr - (long)( seg.get_base() ); 
  };
 private:
  long offset;
};
 
class shm_ptr_out_of_bounds : public std::exception
{
 public:
  const char* what() const throw()
    { return "shm_ptr cannot be created with address outside of segment"; }
};

#endif

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