rust-lang/rust

a safe, concurrent, practical language

Lilian Anatolie Moraru

@lilianmoraru

Yes, using

#![feature(alloc_system)]
extern crate alloc_system;

and Not Rust's allocator, it is leaking...

But you basically intentionally asked for it to leak in that case

Btw, I have mistaken it with this one: https://github.com/dropbox/rust-alloc-no-stdlib

LeonineKing1199

@LeonineKing1199

Oh, that's so interesting.

All I did was use sudo apt-get install rustc

I'm on Ubuntu 16.04

Maybe it's my version of valgrind?

I'm on 3.11 of that

Lilian Anatolie Moraru

@lilianmoraru

@LeonineKing1199 I also use Valgrind 3.11(which is the newest version) and the way you install Rust does not change the behavior

Although, the recommended way of installing and using Rust would be through rustup: https://www.rustup.rs/

LeonineKing1199

@LeonineKing1199

Well, I'm thankful to know that I just have a borked build.

If other people are reporting 0 allocations, that's a good thing.

Alexander Chepurnoy

@kushti

Hi folks! What paper book on Rust can you recommend, if I went through the online book on Rust website, have written some simple programs following it and now want to go deeper?

Thomas Koehler

@Bastacyclop

deeper like Rust internals or as a user ?

Thomas Koehler

@Bastacyclop

I would say that once you've read the official book you will learn the most by practicing and looking at community's code, articles, ...

https://this-week-in-rust.org/ is great to find interesting stuff

Thomas Koehler

@Bastacyclop

I can't really help you for paper books

Thomas Koehler

@Bastacyclop

there is a lot of stuff here too https://github.com/ctjhoa/rust-learning, but the link is on the official website so you probably know it.

Bruno Filippone

@bfil

Anyone cares for a code review? I’ve just open sourced an event store I’ve built with Rust, here it is: https://github.com/bfil/exar-db
It would be great to get some feedback from the community!

Alexander Chepurnoy

@kushti

@Bastacyclop thanks for the tips! I actually missed rust-learning :(

Ingvar Stepanyan

@RReverser

Is there any efficient way to implement WeakMaps in Rust? Well, technically it's not WeakMap because Rust doesn't have GC and thus "weak" doesn't make much sense, but what I'm interested in is a way to store extra information on objects with O(1) lookup, where HashMap is not really the best solution.

Another way of looking into this would be "traits with data members".

To elaborate a little bit more - I'm going to store information associated with nodes in a tree retrieved from an external crate, so just adding data members is not really an option (without forking that crate just for this purpose); recreating entire tree but with wrappers around each node also seems too expensive (and requires lots of code to handle all kinds of nodes).

The only approach that seems to allow this so far is defining custom allocator which would reserve extra space on objects, but I'm not sure I want to go down that way and hope for a simpler solution.

Andrii

@j2ko

https://medium.com/@raphlinus/inside-the-fastest-font-renderer-in-the-world-75ae5270c445#.hi6ebreet

Benjamin Z

@benjyz

Hi. noob here. I'm trying to create a sqlite database

let conn = Connection::open_in_memory().unwrap();

the doc tells me I can open like this: open<P: AsRef<Path>>(path: P) -> Result<Connection>

Benjamin Z

@benjyz

nice.. got it let conn = Connection::open(path).unwrap();

Benjamin Z

@benjyz

how do I put off warnings in cargo?

Thomas Koehler

@Bastacyclop

which warnings ?

Benjamin Z

@benjyz

"function is never used: xyz, #[warn(dead_code)] on by default"

e.g.

Thomas Koehler

@Bastacyclop

FYI this comes from the rust compiler (rustc) which is called by cargo. You can use #[allow(dead_code)] in the code. This is called an attribute https://doc.rust-lang.org/book/attributes.html.

Benjamin Z

@benjyz

thanks. equally I try to ignore other warnings with

warning: unused import, #[warn(unused_imports)] on by default

with this.. doesn't work
"#![warn(unused_imports)]"

Thomas Koehler

@Bastacyclop

#[warn(stuff)] means you want a warning
#[allow(stuff)] means you don't want anything
#[deny(stuff)] means you want an error

wow

Benjamin Z

@benjyz

cool

Thomas Koehler

@Bastacyclop

more attributes here: https://doc.rust-lang.org/reference.html#attributes

Benjamin Z

@benjyz

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