--- Log opened Thu May 09 00:00:09 2019
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02:35 < stevenroose> nickler: they are floats currently
02:36 < stevenroose> so f64 it would be instead of i64. unless you propose having a `serde(with = "")` serde module that converts floats to signed ints, but that sounds crazy
02:37 < stevenroose> andytoshi: you thinking `SignedAmount(Amount, bool)` that just forwards as much of the logic possible to Amount (like parsing by taking the minus out etc..) or a full duplicate `SignedAmount(i64)` that will have quite some code duplication?
02:38 < stevenroose> > `i64` is a bit annoying because of the decimal serialization
02:38 < stevenroose> andytoshi: what do you mean with that?
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03:21 < stevenroose> just a random Rust question: if you have to fulfill a trait that lets you take &self (no mut), but you want to mutate your internal state, you can just put that state in a `Mutex`. Because `Mutex::lock(&self) -> Result<&mut T>` (note the &self -> &mut T). Is this not kind of a hack against Rust's `mut` keyword protecting immutability?
03:22 < stevenroose> I think an Arc can do the same thing. A Rc can't for some reason. Neither can a Box for a more obvious reason.
03:23 < stevenroose> It seems like there is not way to do it without the overhead of a Mutex. (Arc is even more overhead probably) F.e. if the object you're doing this in is already protected by a mutex upstream, it's a bit unfortunate to have an extra Mutex inside.
04:42 < sgeisler> stevenroose: what do you want to do? Does it have something to do with caching/initializing some internal data structure if used? If so a `OnceCell` from https://docs.rs/once_cell/0.2.0/once_cell/ might do the trick.
04:48 < stevenroose> sgeisler: f.e. we have an API client that uses an HTTP client internally so all methods take &self. I implemented a dummy version of the client for testing purposes. Now in order to mimick the API trait from a Rust dummy, it needs to keep some state (like store a tx when a send is done and return history when a fetch is made)
04:48 < stevenroose> So it would be quite silly to have to change the entire interface of the trait to &mut self just because a test dummy version excists.
04:48 < stevenroose> exists*
04:49 < stevenroose> Same goes with a DB dummies f.e. A RocksDB takes &self, so your DB type that has an inner RocksDB::DB will take &self. If you want to quick and dirty DummyDB that implements the same interface but just stores in memory, you'd need &mut self.
04:50 < stevenroose> Are you still on Rocket, I have an example on Github.
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06:58 < nickler> stevenroose: I have no idea really how serde works really, or how the integration is supposed to look like ... will look into that
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08:01 < stevenroose> nickler: amounts are floats now, fwiw
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18:29 < andytoshi> stevenroose: within a thread use `RefCell` rather than `Mutex`
18:29 < andytoshi> this is "internal mutability" and yes it morally evades rust's immutability guarantees, but does so in a safe way
18:29 < andytoshi> re "i64 is annoying", what i mean is that we can't impl Deserialize and Serialize on i64 cuz it's not our type
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--- Log closed Fri May 10 00:00:11 2019