tracing_capture::predicates

Struct Scanner

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pub struct Scanner<T, I> { /* private fields */ }
Expand description

Helper that allows using Predicates rather than closures to find matching elements, and provides more informative error messages.

Returned by the ScanExt methods; see its docs for more details.

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impl<T, I> Scanner<T, I>
where I: Iterator, I::Item: Debug,

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pub fn single<P: Predicate<I::Item> + ?Sized>(self, predicate: &P) -> I::Item

Finds the single item matching the predicate.

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Panics with an informative message if no items, or multiple items match the predicate.

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pub fn first<P: Predicate<I::Item> + ?Sized>(self, predicate: &P) -> I::Item

Finds the first item matching the predicate.

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Panics with an informative message if no items match the predicate.

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pub fn all<P: Predicate<I::Item> + ?Sized>(self, predicate: &P)

Checks that all of the items match the predicate.

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Panics with an informative message if any of items does not match the predicate.

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pub fn none<P: Predicate<I::Item> + ?Sized>(self, predicate: &P)

Checks that none of the items match the predicate.

§Panics

Panics with an informative message if any of items match the predicate.

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impl<T, I> Scanner<T, I>
where I: DoubleEndedIterator, I::Item: Debug,

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pub fn last<P: Predicate<I::Item> + ?Sized>(self, predicate: &P) -> I::Item

Finds the last item matching the predicate.

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Panics with an informative message if no items match the predicate.

Trait Implementations§

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impl<T: Clone, I> Clone for Scanner<T, I>

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fn clone(&self) -> Self

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, I: Debug> Debug for Scanner<T, I>

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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: Copy, I> Copy for Scanner<T, I>

Auto Trait Implementations§

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impl<T, I> Freeze for Scanner<T, I>
where T: Freeze,

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impl<T, I> RefUnwindSafe for Scanner<T, I>
where T: RefUnwindSafe,

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impl<T, I> Send for Scanner<T, I>
where T: Send,

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impl<T, I> Sync for Scanner<T, I>
where T: Sync,

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impl<T, I> Unpin for Scanner<T, I>
where T: Unpin,

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impl<T, I> UnwindSafe for Scanner<T, I>
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<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, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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<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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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

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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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

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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impl<T> ToOwned for T
where 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 T
where 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 T
where 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<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