A safer way to get/set parts of a compact number using contracts

[Finnian Reilly]

[eiffel.org] A safer way to get/set parts of a compact number using contracts

[Finnian Reilly]

The main caveat of the bit-setting technique described in the article was the extra overhead incurred to derive the shift-count from the mask.

But this has now been solved by calling built-in C functions for both msc and gcc compilers. So if available the compiler will use an assembly instruction.

See Unix example EL_BIT_ROUTINES

[eiffel.org] A safer way to get/set parts of a compact number using contracts

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[Ulrich Windl (Google)]

Hi!

Having had a quick glance at the code, and having used such functions in a C project myself, I miss the assertions!
From my C code I experienced that bad things happen if you use the routines incorrectly. Unfortunately I cannot access my code right now to give you some details.

Regards,
Ulrich Windl