#linuxcnc-devel | Logs for 2015-04-07

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[00:06:34] <Tom_L> found it
[00:06:35] <Tom_L> i think
[00:06:43] <Tom_L> woops wrong channel
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[16:25:03] <tjtr33> OT i didnt know Terry Pratchett had died. I was just listening to GuardsGuards and found out .thx terry. https://xkcd.com/1498/
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[18:42:40] <kwallace_T770> Google is not finding anything on what !! does here: char probe_whenclears = !!(probe_type & 2);
[18:44:06] <skunkworks> http://cboard.cprogramming.com/c-programming/133581-what-double-exclamation-mark-c-language.html
[18:44:27] <skunkworks> https://www.google.com/search?q=what+does+double+exclimation+points+mean+in+C&ie=utf-8&oe=utf-8#q=what+does+double+exclimation+points+mean+in+C
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[18:46:46] <jepler> ooh skunkworks ftw
[18:47:05] <kwallace_T770> skunkworks, thank you.
[18:47:29] <jepler> in a more civilised language, you might write bool(probe_type & 2)
[18:47:55] <archivist> ew, not in my C standard book
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[18:48:54] <kwallace_T770> Now that I know what !! does, it seems fairly obvious.
[18:49:36] <skunkworks> it boils down to asking the right question.... :)
[18:49:53] <jepler> You could write that in C++ or Python. In C, you could write (bool)(probe_type & 2) if you've included <stdbool.h> or <rtapi_bool.h>
[18:51:37] <jepler> !!(x) is an idiom that you won't soon forget, so it doesn't matter much that (bool)(x) might be clearer. They both generate identical code in my test (gcc 4.7 -Os targeting amd64)
[18:52:06] <jepler> (interestingly, !!(probe_type & 2)'s assembly includes a shift instruction!)
[18:53:12] <archivist> bool is in the standard
[18:53:41] <jepler> archivist: C99 has _Bool, _True and _False; if you #include <stdbool.h> it adds bool, true and false.
[18:54:04] <archivist> I have C99 open here :)
[18:54:10] <jepler> ah excellent
[18:54:56] <archivist> I have teh defence when someone shouts were is your C standard in ##C
[18:54:57] <jepler> linuxcnc now has a header <rtapi_bool.h> if you want bool, because in kernelspace, true/false/bool need to come from <linux/types.h>
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[19:06:16] <kwallace_T770> Thanks for the help!!
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[19:12:13] <kwallace_T770> BTW, Rogge made a G38.6 probe move that allows a move but ignores a make signal. I just need to have a move that ignores the break signal.
[19:16:37] <kwallace_T770> Geeze, it was in the 70's last week, it was snowing about an hour ago.
[19:21:25] <jepler> just drizzle and 50s here, I can't complain
[19:21:32] <jepler> (but I will refrain from going for my lunchtime walk)
[19:24:38] <kwallace_T770> My fin g erz is frozsn.
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[21:56:02] <kwallace_T770> Oops, Rogge's 38.6 mentioned above masks make and break signals. My problem is somewhere else.
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