Digest for comp.lang.c++@googlegroups.com - 5 updates in 1 topic

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• why use static_cast ? - 5 Updates

why use static_cast ?

JiiPee <kerrttuPoistaTama11@gmail.com>: Oct 20 08:14PM +0300 On 20/10/2022 19:07, Scott Lurndal wrote: > I would argue against this viewpoint, myself.   I mean, using static_cast is not slowing down a program in about 99.9% of cases against not using it. Talking about the slowness of static cast here. But of course I would not put a static cast in a tight loop looping millions of things a second.

scott@slp53.sl.home (Scott Lurndal): Oct 20 05:30PM >of cases against not using it. Talking about the slowness of static cast >here. But of course I would not put a static cast in a tight loop >looping millions of things a second.   static_cast is an annotation. It should not cause any significant differences in the generated code. dynamic_cast, on the other hand, will at a minimum add a lookup to the typeinfo.

JiiPee <kerrttuPoistaTama11@gmail.com>: Oct 20 08:41PM +0300 On 20/10/2022 20:30, Scott Lurndal wrote: > static_cast is an annotation. It should not cause any significant > differences in the generated code. dynamic_cast, on the other > hand, will at a minimum add a lookup to the typeinfo.   sorry mistake, I meant dynamic_cast. But the code I have been doing and seen, I rarely see a place where dynamic cast would slow down signifantly. Because many of the loops are looping something maybe 20-100 times so it does not slow down significantly there.

Lynn McGuire <lynnmcguire5@gmail.com>: Oct 20 01:21PM -0500 On 10/20/2022 8:55 AM, Scott Lurndal wrote: >> character*8. longint is a long long.   > Young C++ programmers don't understand C, so they think > that static_cast<fem::str<8>*> is more "readable". Heh.   The programmer in question is 39 and has been writing C and C++ since he was 13 or 14.   His actual comment was that static_cast's are easier to grep which I find hard to believe.   Thanks, Lynn

Lynn McGuire <lynnmcguire5@gmail.com>: Oct 20 01:21PM -0500 On 10/19/2022 9:01 PM, Lynn McGuire wrote: > character*8.  longint is a long long.   > Thanks, > Lynn   Thanks to all for the views ! They were good.   Lynn

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