Struct 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.

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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> Freeze for Capped<T>
where T: Freeze,

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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,

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'a, T> AsTaggedExplicit<'a> for T
where T: 'a,

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self>

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impl<'a, T> AsTaggedImplicit<'a> for T
where T: 'a,

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fn implicit( self, class: Class, constructed: bool, tag: u32, ) -> TaggedParser<'a, Implicit, Self>

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impl<T> Borrow<T> for T
where 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 T
where 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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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 T
where 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>>
where 'v: 'async_trait, 'life0: 'async_trait, 'life1: '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 T
where U: From<T>,

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Calls U::from(self).

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

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Converts self into a collection.
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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn fg(&self, value: Color) -> Painted<&T>

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Enables the yansi Quirk value.

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

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fn new(self) -> Painted<Self>
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type Target = T

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The target type on which the method may be called.
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fn random<T>(&mut self) -> T

Return a random value via the StandardUniform distribution. Read more
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Return an iterator over random variates Read more
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where T: SampleUniform, R: SampleRange<T>,

Generate a random value in the given range. Read more
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Return a bool with a probability p of being true. Read more
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fn random_ratio(&mut self, numerator: u32, denominator: u32) -> bool

Return a bool with a probability of numerator/denominator of being true. Read more
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Sample a new value, using the given distribution. Read more
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Create an iterator that generates values using the given distribution. Read more
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Fill any type implementing Fill with random data Read more
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fn gen<T>(&mut self) -> T

👎Deprecated since 0.9.0: Renamed to random to avoid conflict with the new gen keyword in Rust 2024.
Alias for Rng::random.
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👎Deprecated since 0.9.0: Renamed to random_range
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fn gen_bool(&mut self, p: f64) -> bool

👎Deprecated since 0.9.0: Renamed to random_bool
Alias for Rng::random_bool.
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fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool

👎Deprecated since 0.9.0: Renamed to random_ratio
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fn next_u32(&mut self) -> u32

Return the next random u32. Read more
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Return the next random u64. Read more
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Fill dest with random data. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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type Error = Infallible

The type returned in the event of a RNG error.
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fn try_next_u32(&mut self) -> Result<u32, <R as TryRngCore>::Error>

Return the next random u32.
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fn try_next_u64(&mut self) -> Result<u64, <R as TryRngCore>::Error>

Return the next random u64.
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fn try_fill_bytes( &mut self, dst: &mut [u8], ) -> Result<(), <R as TryRngCore>::Error>

Fill dest entirely with random data.
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fn unwrap_err(self) -> UnwrapErr<Self>
where Self: Sized,

Wrap RNG with the UnwrapErr wrapper.
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fn unwrap_mut(&mut self) -> UnwrapMut<'_, Self>

Wrap RNG with the UnwrapMut wrapper.
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fn read_adapter(&mut self) -> RngReadAdapter<'_, Self>
where Self: Sized,

Convert an RngCore to a RngReadAdapter.
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impl<V, T> VZip<V> for 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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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> CryptoRng for T
where T: DerefMut, <T as Deref>::Target: CryptoRng,

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impl<T> Formattable for T
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impl<T> Parsable for T
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impl<R> TryCryptoRng for R
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