--- Log opened Sun May 05 00:00:03 2019
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03:31 < bitcoin-git> [bitcoin] Annasadra opened pull request #15955: #18173 ?Акционное письмо (master...master) https://github.com/bitcoin/bitcoin/pull/15955
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03:36 < bitcoin-git> [bitcoin] fanquake closed pull request #15955: #18173 ?Акционное письмо (master...master) https://github.com/bitcoin/bitcoin/pull/15955
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03:55 < bitcoin-git> [bitcoin] Annasadra opened pull request #15956: Ticket Received #18173 (master...master) https://github.com/bitcoin/bitcoin/pull/15956
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03:56 < bitcoin-git> [bitcoin] fanquake closed pull request #15956: Ticket Received #18173 (master...master) https://github.com/bitcoin/bitcoin/pull/15956
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06:25 < Chris_Stewart_5> Has anyone began working on the p2p code for neutrino?
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18:16 < tryphe> i noticed read() accepts 'size_t for its third argument but 'int'
18:16 < tryphe> whoops, 'int' is used here: https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L290
18:17 < tryphe> particularly 'have' and 'NUM_OS_RANDOM_BYTES' are int
18:17 < tryphe> is this intended for some reason, or a bug?
18:21 < sipa> it's a constant, it doesn't matter
18:23 < tryphe> but why?
18:23 < tryphe> size_t is unsigned, int is signed
18:24 < sipa> 32 is 32
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18:25 < tryphe> right but it doesn't really answer my question
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18:26 < gmaxwell> tryphe: use of an unsigned value would potentially risk random unsigned promotions elsewhere.
18:26 < gmaxwell> Which is a common source of gnarly bugs.
18:26 < gmaxwell> 32 fortunately fits in every type (except bool. :P )
18:29 < tryphe> gmaxwell, makes sense, it's that i would think doing that kind of thing might cause platform issues down the road, maybe similar to the way "word" became ambiguous
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18:37 < luke-jr> tryphe: I don't think C++ allows it to be ambiguous
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18:44 < sipa> tryphe: thabkfully we have a lot of control over supported platforms; right now, the code already relies on int being at least 32 bits iirc
18:46 < tryphe> luke-jr, sipa, those are good points, i guess it just makes me think how ints were 16 bits on 16-bit processors and how over time there were problems because interpretation became loose
18:47 < luke-jr> tryphe: int is guaranteed to be at least 16-bit
18:52 < tryphe> what about using an already defined fixed-width type like int32_t?
18:52 < tryphe> would it be preferred over int?
18:53 < luke-jr> it really depends on what the code requires
18:53 < luke-jr> if it's just counting from 1 to 3, int is fine
18:54 < luke-jr> if it's iterating over an array, it should use size_t
18:54 < luke-jr> etc
18:54 < luke-jr> fixed-width types should only be used when there is a need for an exact width
18:55 < tryphe> but if you know it's 32 bits, then that's why C++11 standard made fixed-width types, for that exact reaason
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18:55 < tryphe> it just seems strange that you would use int to me, that's all
18:56 < luke-jr> `int` is the preferred integer type when 16-bits is sufficient
18:56 < luke-jr> the compiler will choose whatever width is best for the target platform
18:56 < luke-jr> eg, it will use 32-bit if 16-bit would entail extra overflow checks/handling
18:57 < tryphe> i thought you guys only supported platforms where it was 32 bits, though
18:59 < sipa> yes
19:00 < tryphe> luke-jr, but from what sipa said, it can only be 32, hence the confusion
19:01 < tryphe> so it can be 16 sometimes?
19:01 < sipa> tryphe: C++ only guarantees that ints are at least 16 bits
19:01 < sipa> bitcoin core only support platforms where it is 32
19:02 < tryphe> gotcha
19:03 < tryphe> i still don't see why you would want to use int, seems like a future rat's nest of problems
19:04 < sipa> really, it is not a big deal
19:04 < sipa> int is big enough for the constant 32, hence, it is enough
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19:07 < tryphe> i see why you would want to use that for promotion to an unsigned type, but i'm just thinking hypothetically i guess :p
19:08 < tryphe> maybe some guy in 100 years compiles an old bitcoin build on the new C++50 standard where ints are 128 bytes, or something, lol
19:08 < tryphe> bits even
19:08 < luke-jr> and it will still work
19:09 < luke-jr> because 32 is still 32 in 128-bit
19:09 < tryphe> yeah, you could even safely promote it to size_t_128 or something i guess :p
19:09 < tryphe> thanks, that makes sense
19:09 < tryphe> wasn't trying to nag, just didn't understand it
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19:55 < tryphe> i'm thankful for bitcoin because watching the development process helps amatuers like me not have such terrible C++ habits :o
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22:37 < jb55> gcc bugs... spooky
22:52 < gwillen> tryphe: one interesting note about int, is that it is the smallest type for which C/C++ will not perform integer promotion behind your back unless the arguments have different types
22:52 < gwillen> if you're smaller than int, you get promoted to int no matter what
22:52 < gwillen> once you're at int, you get left alone unless you need a promotion to make the operation possible 
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23:15 < tryphe> gwillen, neat, thanks!
23:15 < tryphe> gwillen, i guess i had noticed that before, but never had a real explanation for it.
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--- Log closed Mon May 06 00:00:04 2019