kandi X-RAY | crate Summary
kandi X-RAY | crate Summary
CrateDB is a distributed SQL database for storing and analyzing massive amounts of data in real-time. Built on top of Lucene.
Top functions reviewed by kandi - BETA
- Configures all the functions
- Register scalar function module
- Register scalar functions
- Register scalar function types
- Validates a binding
- Returns true if the original binding is not duplicated
- Checks if two types are equals
- Add a binding
- Overrides the default implementation of the superclass method
- Gets constraints
- Writes the header to the stream
- Executes the portal
- Runs the head chunk
- Analyze a restore snapshot
- Returns a map of all analyzers
- Gets doc value aggregator
- Gets the token filters
- Replaces escaped characters in a string
- Analyze values
- Closes a routing table
- Create a new token filter
- Gets the analyzer factories
- This method creates temp file and uri
- Creates a SplitPoints from a QUERY query
- Create temp file and uri
- Fetch dynamic nodes
crate Key Features
crate Examples and Code Snippets
Trending Discussions on crate
I have done a small program, and it shows a weird behavior that I cannot explain. I am using rodio crate to try out some audio stuff.
I have done two programs that, in my opinion, should give the same result.
The first one I use matches to handle errors:...
ANSWERAnswered 2021-Sep-30 at 19:08
The issue is one of scoping and an implementation detail of rodio: the one critical item here is
OutputStream::try_default(), it doesn't really matter how you handle
Sink::try_new(&handle) it'll always behave the same, not so
try_default, if you match or
if let it it'll work fine, if you
unwrap it it'll fail.
But why would that be, the two should be equivalent. The answer is in the details of rodio, specifically of
I have been using the
#[tokio::main] macro in one of my programs. After importing
main and using it unqualified, I encountered an unexpected error.
ANSWERAnswered 2022-Feb-15 at 23:57
#[main] is an old, unstable attribute that was mostly removed from the language in 1.53.0. However, the removal missed one line, with the result you see: the attribute had no effect, but it could be used on stable Rust without an error, and conflicted with imported attributes named
main. This was a bug, not intended behaviour. It has been fixed as of
1.59.0-beta.8. Your example with
use tokio::main; and
#[main] can now run without error.
Before it was removed, the unstable
#[main] was used to specify the entry point of a program. Alex Crichton described the behaviour of it and related attributes in a 2016 comment on GitHub:
Ah yes, we've got three entry points. I.. think this is how they work:
#[start], the receiver of
char **argv. This is literally the symbol
main(or what is called by that symbol generated in the compiler).
- Next, there's
#[lang = "start"]. If no
#[start]exists in the crate graph then the compiler generates a
mainfunction that calls this. This functions receives argc/argv along with a third argument that is a function pointer to the
#[main]function (defined below). Importantly,
#[lang = "start"]can be located in a library. For example it's located in the standard library (libstd).
#[main], the main function for an executable. This is passed no arguments and is called by
#[lang = "start"](if it decides to). The standard library uses this to initialize itself and then call the Rust program. This, if not specified, defaults to
fn mainat the top.
So to answer your question, this isn't the same as
#[start]. To answer your other (possibly not yet asked) question, yes we have too many entry points.
I have a little library where I can define integer types. These are intended for type-safe indexing into arrays and strings in the kind of algorithms I often write. For example, I can use it to define an offset type,
Offset and an index type,
Idx such that you can get an
Offset by subtracting two
Idx, you can get
Idx by adding or subtracting
Offset, but you cannot for example multiple or add
ANSWERAnswered 2022-Feb-10 at 05:54
No, you can't.
By definition of the orphan rules:
impl Trait for T0, an
implis valid only if at least one of the following is true:
- Trait is a local trait
- All of
Only the appearance of uncovered type parameters is restricted. Note that for the purposes of coherence, fundamental types are special. The T in Box is not considered covered, and Box is considered local.
traitwhich was defined in the current crate. A trait definition is local or not independent of applied type arguments. Given
Foois always local, regardless of the types substituted for
unionwhich was defined in the current crate. This is not affected by applied type arguments.
struct Foois considered local, but
LocalTypeis local. Type aliases do not affect locality.
Vec are local, and
Range is not a fundamental type, you cannot
impl Index<...>> for Vec, no matter what you put in the place of the
The reason for these rules is that nothing prevents
Vec from implementing
impl Index> for Vec. Such impl does not exist, and probably never will, but the rules are the same among all types, and in the general case this definitely can happen.
You cannot overload the range operator either - it always creates a
The only solution I can think about is to create a newtype wrapper for
Vec, as suggested in the comments.
If you want your vector to return a wrapped slice, you can use a bit of unsafe code:
This may be a stupid question, but I cannot seem to solve this.
I have this kind of file structure:...
ANSWERAnswered 2022-Jan-31 at 19:19
There is no
main module, even though you have a
main.rs file. The stuff you put in the
main.rs file are considered to be at the root of the crate.
So you have two ways to call the function:1. Directly (w/o use)
I'm trying to create a Printing Server in rust and face a problem when trying to send JSON as a response.
I've found on the Rocket documentation that is really easy to send JSON as a response: You just have to use the Serde library.
Unfortunatly, that wasn't so simple for me...
Here is my current code :...
ANSWERAnswered 2021-Aug-06 at 14:23
You are using rocket 0.5.0-rc.1 and rocket_contrib 0.4.10. While
Json from rocket_contrib does implement
Responder, it implements the
Responder trait of Rocket v4, not that of Rocket v5.
In Rocket v5,
Json is not part of
rocket_contib anymore, but included in the
rocket crate (note that you need to enable the
json feature on the
Using the cxx crate: https://crates.io/crates/cxx
I have the following struct on Rust:...
ANSWERAnswered 2022-Jan-27 at 20:47
Hey @all I was playing with WebAssembly Studio and created an empty Rust project.
In my Rust code, I'm returning the pointer and the length for my "Hello World" string. Compiling worked fine, but I was expecting the resulting WASM to have a function returning two i32. But I found a function taking one i32 and returning nothing.
Why is the function not having the signature fn () -> (i32,i32) ?
How am I supposed to extract the two values from the WASM module? (Using Rust-wasmtime)
Below you can find the code snippets I'm talking about. Thanks in advance!...
ANSWERAnswered 2022-Jan-18 at 09:48
WebAssembly got the ability to return multiple values just recently. The compiler used doesn't seem to support this yet or doesn't use it for compatibility reasons, i.e. for runtimes that don't know this feature yet.
Therefore, the compiler rewrites the code as follows:
Recently when I was learning Type Layout in Rust (https://doc.rust-lang.org/reference/type-layout.html), I saw that struct in Rust supports the #[repr(C)] directive, so I wanna to see the difference between the default(Rust) representation and C-like representation. Here comes the code:...
ANSWERAnswered 2022-Jan-05 at 04:26
This crate does not seem to account for field reordering. It appears the compiler reordered the struct to have
vec! macro implementation there is this rule:
ANSWERAnswered 2021-Dec-18 at 21:03
Let's go step by step to see how
<[_]>::into_vec(box [$($x),+]) produces a
[$($x),+]expands to an array of input elements:
[1, 2, 3]
box ...puts that into a
boxexpressions are nightly-only syntax sugar for
box 5is syntax sugar for
Box::new(5)(actually it's the other way around: internally
box, which is implemented in the compiler)
to_vecmethod on a slice containing elements that have an inferred type (
[_]). Wrapping the
[_]in angled brackets is needed for syntactic reasons to call an method on a slice type. And
into_vecis a function that takes a boxed slice and produces a
So far, I've seen two builder patterns in official Rust code and other crates:...
ANSWERAnswered 2021-Dec-19 at 02:26
No vulnerabilities reported
You can use crate like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the crate component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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