True. Robby
On Thu, Sep 17, 2015 at 9:16 PM, Sam Tobin-Hochstadt <[email protected]> wrote: > I don't know if it's really fixable -- equal? has to check that both > arguments are symbols before producing #f, which is work that eq? doesn't > do. Perhaps the difference can be reduced, though. > > Sam > > > On Thu, Sep 17, 2015, 10:13 PM Robby Findler <[email protected]> > wrote: >> >> Sounds like something I would try to fix if I had time to really focus >> on the eq? semantic question :( >> >> On Thu, Sep 17, 2015 at 9:01 PM, Sam Tobin-Hochstadt >> <[email protected]> wrote: >> > Unfortunately, that's only true when eq? produces #t, which probably >> > isn't >> > an issue when using eq? directly, but can be when using memq or similar. >> > This benchmark suggests about a 10x speed difference when the symbols >> > are >> > different: http://pasterack.org/pastes/94877 >> > >> > Sam >> > >> > >> > On Thu, Sep 17, 2015, 9:52 PM Robby Findler >> > <[email protected]> >> > wrote: >> >> >> >> FWIW, if you use equal? in those cases, you'll get the same >> >> performance behavior and you will have fewer eq?s to audit when things >> >> go wonky. >> >> >> >> ;) >> >> >> >> Robby >> >> >> >> On Thu, Sep 17, 2015 at 8:36 PM, Neil Van Dyke <[email protected]> >> >> wrote: >> >> > Whew. :) I only rarely have a non-symbol use for `eq?`, but I use >> >> > `eq?` >> >> > heavily for symbols in everyday application code. >> >> > >> >> > Robby Findler wrote on 09/17/2015 09:27 PM: >> >> >> >> >> >> eq? on symbols is a special part of the specification and that seems >> >> >> benign to me, all things considered. The "giant hash in the sky" >> >> >> that >> >> >> makes sure that works isn't exactly trouble free, but we seem to >> >> >> have >> >> >> it under control. >> >> > >> >> > >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups >> >> > "Racket Users" group. >> >> > To unsubscribe from this group and stop receiving emails from it, >> >> > send >> >> > an >> >> > email to [email protected]. >> >> > For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> >> You received this message because you are subscribed to the Google >> >> Groups >> >> "Racket Users" group. >> >> To unsubscribe from this group and stop receiving emails from it, send >> >> an >> >> email to [email protected]. >> >> For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
