In compiled languages, its also about giving the compiler clues about optimisations it can safely perform, especially in multi-threaded environments. A const value can be safely shared without locking, or moved into a register and not re-read for every reference. The current big problem is the lack of transitivity of const.

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In reply to Re^3: const correctness by BrowserUk
in thread const correctness by John M. Dlugosz

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