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From: Pavol Droba (droba_at_[hidden])
Date: 2002-11-24 03:46:20


I have developed a simple cast function which I found very useful. Here it is:

        template< typename T >
        inline T offset_cast( void* p, unsigned int offset=0 )
                return reinterpret_cast< T >( static_cast<unsigned char*>( p )+offset );
        template< typename T >
        inline T offset_cast( const void* p, unsigned int offset=0 )
                return reinterpret_cast< T >( static_cast<const unsigned char*>( p )+offset );

Its purposes is to simplify a mapping of C-like structure onto binary data. Here is
the example: Assume thath you have a network packet in raw format, and you want
to read IP-header information. You could do following:

        ip_header* ip=offset_cast<ip_header>( packet, ip_header_offset );

instead of ugly pointer arithmetic.

Is there any interest for something like this in Boost?


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