--- Log opened Sun Jun 07 00:00:43 2020
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03:07 < elichai2> it's probably worse, `collect` have problems with pre allocating
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03:15 < sgeisler> Isn't that what size hints are for? `take` can give you an upper bound and `repeat` has no lower bound, so maybe that iterator would know its exact size?
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03:48 < elichai2> yeah it's kinda broken IIRC
03:53 < elichai2> But I can't find that issue rn
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10:23 < andytoshi> i'd go with whatever's more readable
10:23 < andytoshi> i do remember this bug in `collect`, but i'm not too worried about it. if it's causing us problems we should work around it, sure, but otherwise we should just wait for stdlib to get their act together
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11:38 < Kiminuo> andytoshi, https://github.com/apoelstra/rust-miniscript/pull/96#issuecomment-640170389 - It looks like we have a first PR conflict in miniscript. Sanket's PR looks better though, unfortunately :)
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11:42 < elichai2> andytoshi: agreed.
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16:25 < junderw> Hi everyone
16:26 < junderw> I am making a library using secp256k1 library published by rust-bitcoin, and I want to instanciate Secp256k1::new() once when I do MyStruct::new()...
16:26 < junderw> but I can't get the type right...
16:27 < junderw> looking at the library I need Secp256k1<All>
16:27 < junderw> but All is a member of the context module which is private.
16:27 < junderw> Note: I am a rust beginner.
16:29 < junderw> If anyone can tell me how I can do Secp256k1::new() once when I instantiate my struct. (If there's a way to do that without getting at the secp256k1::context::std_only::All then I'd like to hear it too)
16:30 < junderw> Secp256k1::new() is super expensive and doing it at the beginning of every method is slow.
16:31 < junderw> btw, some of my methods will only use verify, some will only use sign etc... so if there's some reason why I should get an instance of SignOnly and VerifyOnly each and store both I would love to hear it. Thanks.
16:52 < gwillen> junderw: I can tell you that there's no advantage to having multiple instances, in pretty much any case
16:52 < gwillen> using one of the Only contexts will just save you some time and memory when initializing the context
16:52 < gwillen> but if you need both just use All, and mostly it's fine to use All no matter what
16:52 < gwillen> and then save the context and reuse it for everything, yeah
16:54 < gwillen> do you have an example of the thing you're trying to do that isn't working? I am mostly familiar with the C secp library (which this is bindings for), but I know some Rust as well. I would expect Secp256k1::new() to Just Work.
16:56 < gwillen> actuall junderw I think the type you want is secp256k1::All, did you see/try that?
16:56 < junderw> pub struct MyStruct { secp: Secp256k1, } gives me a type error.
16:56 < junderw> that's my problem
16:56 < junderw> Secp256k1<All> is what I want
16:56 < junderw> but All is defined in a private mod
16:56 < gwillen> can you use Secp256k1<secp256k1::All> ?
16:56 < gwillen> I don't think that definition of All is private
16:57 < gwillen> I think that's the one that's meant for you to use
17:00 < junderw> gwillen thanks that worked. I'm new to rust and Atom's IDE feature is spotty at best with listing members of things.
17:00 < junderw> problem resolved
17:01 < gwillen> ahhh that makes sense, it grabbed the wrong one
17:02 < gwillen> for future reference, here's how I figured it out: look at https://docs.rs/secp256k1/0.17.2/secp256k1/struct.Secp256k1.html, and look at the definition of new9)
17:02 < gwillen> er, the definition of new(). You will see that all the types are clickable. If you click "All", it takes you to https://docs.rs/secp256k1/0.17.2/secp256k1/enum.All.html which tells you the type you want.
17:20 < junderw> awesome
19:22 < junderw> Question: How do I get the inner slice of the ffi::PublicKey object when it's private. `pubkey.0` yells at me because "it's private."
19:23 < junderw> I have an ffi:PublicKey and I would like to make a secp256k1::PublicKey
19:23 < junderw> (ffi meaning secp256k1_sys)
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20:07 < junderw> nvm, I was able to get it to work without needing to do that.
20:08 < junderw> This is what I'm working on BTW https://github.com/junderw/tiny-secp256k1-wasm/pull/2
20:08 < junderw> pointAdd is "match hell"
20:09 < junderw> (for context, this is a WASM implementation via rust for this interface/library https://github.com/bitcoinjs/tiny-secp256k1
20:10 < junderw> native/addon.cpp or js.js should give you an idea of the interface.
20:10 < junderw> it's also documented in the README if anyone wants to help out :-D
20:11 < junderw> once I'm done I would appreciate if anyone has time to review.
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--- Log closed Mon Jun 08 00:00:44 2020