On Tue, Nov 12, 2013 at 3:05 PM, jean-marc Mercier < [email protected]> wrote:
> Thus I could use maps to simulate HashSet, it not a very big overload. > However, is there any incentive to trade off 20% performance ? > Immutability is its own reward, or, rather, comes with its own set of them. :) Working with immutable data makes lock-free thread-safety comparatively trivial, and enables a wide array of aggressive optimizations (including providing the compiler the option to make operations concurrent at-will; safe caching/memoization; etc). Moreover, introducing things that *aren't* known to be immutible, thread-safe, deterministic operations into an environment where those guarantees otherwise exist means that a lot of optimizations are suddenly off-the-table / unsafe.
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