Struct rocket::data::Capped

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pub struct Capped<T> {
    pub value: T,
    pub n: N,
}
Expand description

Encapsulates a value capped to a data limit.

A Capped<T> type represents a T that has been limited (capped) to some number of bytes. The internal N specifies whether the value is complete (also Capped::is_complete()) or whether it was capped prematurely. A Capped is returned by various methods of DataStream. Some Capped<T> types, like Capped<String> and Capped<TempFile>, implement traits like FromData and FromForm.

Example

Since Capped<TempFile> implements FromData, it can be used as a data guard. The following Rocket route accepts a raw upload and stores the upload in a different directory depending on whether the file exceeded the data limit or not. See TempFile for details on temporary file storage locations and limits.

use rocket::data::Capped;
use rocket::fs::TempFile;

#[post("/upload", data = "<file>")]
async fn upload(mut file: Capped<TempFile<'_>>) -> std::io::Result<()> {
    if file.is_complete() {
        file.persist_to("/tmp/complete/file.txt").await?;
    } else {
        file.persist_to("/tmp/incomplete/file.txt").await?;
    }

    Ok(())
}

Fields§

§value: T

The capped value itself.

§n: N

The number of bytes written and whether value is complete.

Implementations§

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impl<T> Capped<T>

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pub fn new(value: T, n: N) -> Self

Creates a new Capped from a value and an n. Prefer to use Capped::from() when possible.

Example
use rocket::data::{Capped, N};

let n = N { written: 2, complete: true };
let capped = Capped::new("hi".to_string(), n);
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pub fn complete(value: T, len: usize) -> Self

Creates a new Capped from a value and the length of value n, marking value as complete. Prefer to use Capped::from() when possible.

Example
use rocket::data::{Capped, N};

let string = "hi";
let capped = Capped::complete("hi", string.len());
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pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Capped<U>

Converts a Capped<T> to Capped<U> by applying f to the contained value.

Example
use rocket::data::{Capped, N};

let n = N { written: 2, complete: true };
let capped: Capped<usize> = Capped::new(10usize, n);
let mapped: Capped<String> = capped.map(|n| n.to_string());
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pub fn is_empty(&self) -> bool

Returns true if self.n.written is 0, that is, no bytes were written to value.

Example
use rocket::data::{Capped, N};

let n = N { written: 2, complete: true };
let capped = Capped::new("hi".to_string(), n);
assert!(!capped.is_empty());

let n = N { written: 0, complete: true };
let capped = Capped::new("".to_string(), n);
assert!(capped.is_empty());
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pub fn is_complete(&self) -> bool

Returns true if self.n.complete, that is, value represents the entire data stream.

Example
use rocket::data::{Capped, N};

let n = N { written: 2, complete: true };
let capped = Capped::new("hi".to_string(), n);
assert!(capped.is_complete());

let n = N { written: 4, complete: false };
let capped = Capped::new("hell".to_string(), n);
assert!(!capped.is_complete());
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pub fn into_inner(self) -> T

Returns the internal value.

Example
use rocket::data::{Capped, N};

let n = N { written: 2, complete: true };
let capped = Capped::new("hi".to_string(), n);
assert_eq!(capped.into_inner(), "hi");

Trait Implementations§

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impl<T: Clone> Clone for Capped<T>

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fn clone(&self) -> Capped<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for Capped<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T> Deref for Capped<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<T> DerefMut for Capped<T>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<T: AsRef<[u8]>> From<T> for Capped<T>

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fn from(value: T) -> Self

Creates a Capped<T> from a value, setting complete to true.

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impl<'r> FromData<'r> for Capped<&'r [u8]>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<&'r RawStr>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<&'r str>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<Cow<'_, str>>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<String>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<TempFile<'_>>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'r> FromData<'r> for Capped<Vec<u8>>

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type Error = Error

The associated error to be returned when the guard fails.
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fn from_data<'life0, 'async_trait>( req: &'r Request<'life0>, data: Data<'r> ) -> Pin<Box<dyn Future<Output = Outcome<'r, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Asynchronously validates, parses, and converts an instance of Self from the incoming request body data. Read more
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impl<'v> FromFormField<'v> for Capped<&'v [u8]>

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fn from_value(field: ValueField<'v>) -> Result<'v, Self>

Parse a value of T from a form value field. Read more
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fn from_data<'life0, 'async_trait>( f: DataField<'v, 'life0> ) -> Pin<Box<dyn Future<Output = Result<'v, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait,

Parse a value of T from a form data field. Read more
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fn default() -> Option<Self>

Returns a default value, if any exists, to be used during lenient parsing when the form field is missing. Read more
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impl<'v> FromFormField<'v> for Capped<&'v str>

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fn from_value(field: ValueField<'v>) -> Result<'v, Self>

Parse a value of T from a form value field. Read more
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fn from_data<'life0, 'async_trait>( f: DataField<'v, 'life0> ) -> Pin<Box<dyn Future<Output = Result<'v, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait,

Parse a value of T from a form data field. Read more
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fn default() -> Option<Self>

Returns a default value, if any exists, to be used during lenient parsing when the form field is missing. Read more
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impl<'v> FromFormField<'v> for Capped<Cow<'v, str>>

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fn from_value(field: ValueField<'v>) -> Result<'v, Self>

Parse a value of T from a form value field. Read more
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fn from_data<'life0, 'async_trait>( field: DataField<'v, 'life0> ) -> Pin<Box<dyn Future<Output = Result<'v, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait,

Parse a value of T from a form data field. Read more
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fn default() -> Option<Self>

Returns a default value, if any exists, to be used during lenient parsing when the form field is missing. Read more
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impl<'v> FromFormField<'v> for Capped<String>

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fn from_value(field: ValueField<'v>) -> Result<'v, Self>

Parse a value of T from a form value field. Read more
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fn from_data<'life0, 'async_trait>( f: DataField<'v, 'life0> ) -> Pin<Box<dyn Future<Output = Result<'v, Self>> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait,

Parse a value of T from a form data field. Read more
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fn default() -> Option<Self>

Returns a default value, if any exists, to be used during lenient parsing when the form field is missing. Read more
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impl<'v> FromFormField<'v> for Capped<TempFile<'v>>

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fn from_value(field: ValueField<'v>) -> Result<Self, Errors<'v>>

Parse a value of T from a form value field. Read more
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fn from_data<'life0, 'async_trait>( f: DataField<'v, 'life0> ) -> Pin<Box<dyn Future<Output = Result<Self, Errors<'v>>> + Send + 'async_trait>>where Self: 'async_trait, 'v: 'async_trait, 'life0: 'async_trait,

Parse a value of T from a form data field. Read more
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fn default() -> Option<Self>

Returns a default value, if any exists, to be used during lenient parsing when the form field is missing. Read more
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impl<L, T: Len<L>> Len<L> for Capped<T>

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fn len(&self) -> L

The length of the value.
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fn len_into_u64(len: L) -> u64

Convert len into u64.
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fn zero_len() -> L

The zero value for L.
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impl<'r, 'o: 'r, T: Responder<'r, 'o>> Responder<'r, 'o> for Capped<T>

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fn respond_to(self, request: &'r Request<'_>) -> Result<'o>

Returns Ok if a Response could be generated successfully. Otherwise, returns an Err with a failing Status. Read more
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impl<T: Copy> Copy for Capped<T>

Auto Trait Implementations§

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impl<T> RefUnwindSafe for Capped<T>where T: RefUnwindSafe,

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impl<T> Send for Capped<T>where T: Send,

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impl<T> Sync for Capped<T>where T: Sync,

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impl<T> Unpin for Capped<T>where T: Unpin,

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impl<T> UnwindSafe for Capped<T>where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<'v, T> FromForm<'v> for Twhere T: FromFormField<'v>,

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type Context = FromFieldContext<'v, T>

The form guard’s parsing context.
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fn init(opts: Options) -> <T as FromForm<'v>>::Context

Initializes and returns the parsing context for Self.
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fn push_value(ctxt: &mut <T as FromForm<'v>>::Context, field: ValueField<'v>)

Processes the value field field.
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fn push_data<'life0, 'life1, 'async_trait>( ctxt: &'life0 mut FromFieldContext<'v, T>, field: DataField<'v, 'life1> ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait, Global>>where 'v: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, T: 'async_trait,

Processes the data field field.
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fn finalize(ctxt: <T as FromForm<'v>>::Context) -> Result<T, Errors<'v>>

Finalizes parsing. Returns the parsed value when successful or collection of Errors otherwise.
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fn push_error(_ctxt: &mut Self::Context, _error: Error<'r>)

Processes the external form or field error _error. Read more
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fn default(opts: Options) -> Option<Self>

Returns a default value, if any, to use when a value is desired and parsing fails. Read more
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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoCollection<T> for T

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fn into_collection<A>(self) -> SmallVec<A>where A: Array<Item = T>,

Converts self into a collection.
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fn mapped<U, F, A>(self, f: F) -> SmallVec<A>where F: FnMut(T) -> U, A: Array<Item = U>,

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impl<T> Paint for Twhere T: ?Sized,

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fn fg(&self, value: Color) -> Painted<&T>

Returns a styled value derived from self with the foreground set to value.

This method should be used rarely. Instead, prefer to use color-specific builder methods like red() and green(), which have the same functionality but are pithier.

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Set foreground color to white using fg():

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Returns self with the quirk() set to Quirk::OnBright.

Example
println!("{}", value.on_bright());
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fn whenever(&self, value: Condition) -> Painted<&T>

Conditionally enable styling based on whether the Condition value applies. Replaces any previous condition.

See the crate level docs for more details.

Example

Enable styling painted only when both stdout and stderr are TTYs:

use yansi::{Paint, Condition};

painted.red().on_yellow().whenever(Condition::STDOUTERR_ARE_TTY);
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fn new(self) -> Painted<Self>where Self: Sized,

Create a new Painted with a default Style. Read more
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fn paint<S>(&self, style: S) -> Painted<&Self>where S: Into<Style>,

Apply a style wholesale to self. Any previous style is replaced. Read more
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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> Formattable for Twhere T: Deref, <T as Deref>::Target: Formattable,

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impl<T> Parsable for Twhere T: Deref, <T as Deref>::Target: Parsable,