| --- Log opened Mon Jun 27 00:00:24 2016 |
| 00:07 | | Kindamoody is now known as Kindamoody[zZz] |
| 01:20 | <&Derakon> | Random thought: what does "i = ++i++" do in C? |
| 01:23 | <@celticminstrel> | My first thought is, is that undefined behaviour? |
| 01:24 | <@celticminstrel> | Even if not, though, it's a pretty weird statement... it's not clear to me which increment would be executed first, for instance. |
| 01:24 | <@Azash> | I wouldn't think so? |
| 01:24 | <@Azash> | It increments i by 1, sets it to itself, and increments it by 1 again |
| 01:24 | <@Azash> | afaict |
| 01:25 | <@celticminstrel> | ...how do you get that from it? |
| 01:25 | <&Derakon> | It may well be undefined and/or compiler-dependent. |
| 01:25 | <@celticminstrel> | If you go strictly right to left... |
| 01:26 | <@celticminstrel> | If that's how the precedence works, I think it wouldn't compile. |
| 01:26 | <@celticminstrel> | Because the post-increment would return an r-value, and pre-increment cannot be applied to an r-value. |
| 01:27 | <@celticminstrel> | Assuming that it compiles, I guess the pre-increment would first increase i be 1; then, the pre-increment would increase it again, after which the assignment effectively decrements it. So the final effect is of i being increased by 1. |
| 01:27 | <@celticminstrel> | s/be/by/ |
| 01:27 | <@Azash> | Hm.. According to this table at cppreference both prefix and suffix increments have precedence over assignment |
| 01:28 | | * Azash forgets |
| 01:28 | <&Derakon> | Yes, because j = ++i should execute the ++ before the =. |
| 01:28 | <@celticminstrel> | Hmm, that table seems to support post-increment being executed first, though. |
| 01:28 | <@Azash> | I thought one of those was lower to allow eg. lower = higher_by_one++; or so |
| 01:29 | <@celticminstrel> | "lower = higher_by_one++" increments higher_by_one, then assigns its former value to lower. |
| 01:29 | <@Azash> | "I thought one of those" was there to denote that I forgot which one that was |
| 01:30 | <@Azash> | But apparently neither one does |
| 01:30 | <@celticminstrel> | Based on that table, I think Derakon's statement probably should not compile... |
| 01:30 | <@Azash> | And yeah celticminstrel that's actually what I meant |
| 01:30 | <@Azash> | I didn't realize the return worked in mysterious ways though |
| 01:31 | <@celticminstrel> | The normal implementation of i++ is {auto j = i; ++i; return k} |
| 01:31 | <@celticminstrel> | j, not k |
| 01:31 | <@celticminstrel> | Copy, increment, return the copy. |
| 01:31 | <@Azash> | Right |
| 01:32 | <&Derakon> | Which makes it super-weird that "i++" is the default. |
| 01:32 | <&Derakon> | Postincrement should be deprecated in favor of pre-increment in basically every scenario. |
| 01:32 | <@celticminstrel> | Preincrement is more efficient in most cases, yeah. I don't think it actually makes a difference with integers, though. |
| 01:33 | <&Derakon> | It's not so much efficiency as it is having mechanics that make sense. |
| 01:34 | <&Derakon> | "increment i and then return the non-incremented value". Who ever thought that was a useful thing to do? |
| 01:34 | <@celticminstrel> | I don't know, but I can't claim it's not useful. |
| 01:35 | <&Derakon> | What for? |
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| 03:47 | <&McMartin> | while (*dest++ = *src++); |
| 03:47 | <&McMartin> | Is the traditional implementation of strcpy |
| 03:49 | <&McMartin> | Which is also the MOVSB instruction on x86, and the postincrement addressing mode in a lot of the old minicomputers |
| 03:49 | <&McMartin> | "After you read this pointer, make the pointer point to the next thing" |
| 03:50 | <&McMartin> | C was simply directly exposing a generic chip capability of the time. |
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| 14:53 | | * TheWatcher flails |
| 14:53 | <@TheWatcher> | Temporary variables everywhere |
| 14:57 | <~Vornicus> | gonna put that under that picture of Buzz Lightyear? |
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| 18:59 | <@gnolam> | https://twitter.com/cperciva/status/746590650661888000 |
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| 21:05 | <&McMartin> | "Version 1.0 of .NET Core, the open source, cross-platform .NET runtime platform that was first announced in 2014, has been released today." |
| 21:05 | <&McMartin> | "Microsoft picked an unusual venue to announce the release: the Red Hat Summit." |
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| 21:39 | <&McMartin> | TIL: std::shared_ptr lets you call the routines from std::atomic on itself |
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| --- Log closed Tue Jun 28 00:00:40 2016 |