hashbrown | Rust port of Google 's SwissTable hash map | Hashing library
kandi X-RAY | hashbrown Summary
kandi X-RAY | hashbrown Summary
[Rust] This crate is a Rust port of Google’s high-performance [SwissTable] hash map, adapted to make it a drop-in replacement for Rust’s standard HashMap and HashSet types. The original C++ version of SwissTable can be found [here], and this [CppCon talk] gives an overview of how the algorithm works. Since Rust 1.36, this is now the HashMap implementation for the Rust standard library. However you may still want to use this crate instead since it works in environments without std, such as embedded systems and kernels. [SwissTable]: [here]: [CppCon talk]:
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Community Discussions
Trending Discussions on hashbrown
QUESTION
I have a hashbrown::HashSet, and I am trying to use Rayon's par_iter with it, but I cannot figure out the right syntax.
Cargo.toml
...ANSWER
Answered 2021-Feb-05 at 20:15If you look inside of the hashbrown crate, you will see that rayon support is only present if the rayon feature is enabled. You can enable the feature in your Cargo.toml:
QUESTION
When building my Rust lambda using cross, I get this error:
ANSWER
Answered 2020-Nov-30 at 19:46Reqwest lists OpenSSL as a requirement on Linux due to it using native-tls, which depends on openssl. You need to install the pkg-config and libssl-dev packages:
QUESTION
I started to learn GraphQL and I'm trying to create the following relationship:
...ANSWER
Answered 2020-May-02 at 10:39Calling shift and push on an array while iterating through that same array will invariably lead to some unexpected results. You could make a copy of the array, but it'd be much easier to just use map:
QUESTION
There is an async connect() function as below.
ANSWER
Answered 2019-Aug-29 at 00:14let future01 = future03.unit_error().boxed_local().compat();
QUESTION
I'm trying to retrieve tables from lua files in Rust. I'm registering a register_entity function in the lua global context for data files to register their tables. When the lua file is executed and it calls the register_entity function, the registered callback is called in Rust. The callback should add the passed table into a HashMap to maintain a collection of all entities.
Here's an example lua file that is being read.
...ANSWER
Answered 2019-Jul-26 at 18:45You cannot store reference to lua_ctx outside the call to Lua::context. The rlua::Table you store in entities is bound to the lifetime of lua_ctx.
rlua provides a way to store reference to Lua objects outside of context calls, with Context::create_registry_value. It returns a Regsitry key that you can safely store in your HashMap, and use it afterwards in another call to Lua::context. Check the following code for an example :
QUESTION
When I try to cargo build the 'hello world' of amethyst on Ubuntu 18.04, I get an error about missing libraries from lxbcb. I'm not sure what this error is trying to tell me or how to fix it. It seems like I'm missing libraries -lxcb-render, -lxcb-shap, and -lxcb-xfixes, but I can't seem to find them.
The hello world code of amethyst
...ANSWER
Answered 2019-Apr-21 at 06:53It looks like I missed installing some dependencies.
sudo apt install pkg-config libasound2-dev libssl-dev cmake libfreetype6-dev libexpat1-dev libxcb-composite0-dev
QUESTION
i want to add dynamically selected items in ExpandoObject then print it in the form of json value. if i selected 2values, it is printing only the last value 2times.My problem is whatever im selecting it prints last value only.
My code: Declaration
...ANSWER
Answered 2019-Apr-01 at 05:01dynamic foo = new ExpandoObject();
you declare global variables here,so the second time you call the following code, you are reassuming the first foo and adding it again, so there are two identical items in the output List.
QUESTION
I am currently trying to append a set of data that is seperated by a comma like this:
lastname, firstname, id-number
lastname2, firstname2, id-number2
etc...
into a class object that looks like this:
...ANSWER
Answered 2019-Feb-01 at 07:48There are several issues that look suspicious in the program. You are creating, for example, a local variable of type "array of Customer" within a loop body; it will be initialized again and again with every iteration of the loop, and it will get invalid / go out of scope once the loop has finished.
Anyway, the following statement will yield undefined behaviour:
QUESTION
I'm trying to defend my game against SQL injection, and I've read using prepared statements is one way to do it, something like this:
...ANSWER
Answered 2018-Sep-12 at 10:48Did you try:
QUESTION
I'm working on a game that requires the user (primarily kids) to combine a prefix and a suffix into a unique username, say, BlueBaron. Now there's only so many prefixes and suffixes, so if a user generates an existing one, a number is appended to it, say, BlueBaron2.
I have a table as follows:
...ANSWER
Answered 2018-Sep-10 at 11:31That's a good question. I'm no developer, but from a database admins view, I'd say that you need to do it like this.
You definitely need a unique index spanning over the 3 columns.
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Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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