Pavol Droba <[EMAIL PROTECTED]> writes:
> Hi,
>
> 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?
My answer: "not if it uses reinterpret_cast, since that's not
portable".
--
David Abrahams
[EMAIL PROTECTED] * http://www.boost-consulting.com
Boost support, enhancements, training, and commercial distribution
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