Struct Tag

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pub struct Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T>,
{ /* private fields */ }
Expand description

A tag generic over its containing value type.

There are two ways to construct a Tag:

  • You already have a T: Just use new()
let tag = Tag::<bool>::new("foo".to_owned(), true);
  • You have something that may be able to be turned into a TagValue<T>. In that case, either use parse() or the TryInto implementation. parse() accepts an impl Into<RawTagValue>, which is implemented for String:
let tag = Tag::<bool>::parse("foo".to_owned(), "true".to_owned()).unwrap();

Both the TryInto implementation and parse() may return a ParseTagValueError that contains more information about the parse failure.

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impl<T> Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T>,

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pub fn new(key: impl Into<TagKey>, value: T) -> Self

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pub fn parse( key: impl Into<TagKey>, value: impl Into<String>, ) -> Result<Self, ParseTagValueError>
where T: TagValue<T, Error = ParseTagValueError>,

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impl<T> Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T>,

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pub const fn key(&self) -> &TagKey

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pub const fn value(&self) -> &T

Trait Implementations§

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impl<T> Debug for Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T> + Debug,

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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> From<Tag<T>> for RawTag
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T>, InnerTagValue<T>: Display + Into<RawTagValue>,

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fn from(tag: Tag<T>) -> Self

Converts to this type from the input type.
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impl<T> From<Tag<T>> for Tag
where T: Debug + Clone + PartialEq + Eq + Into<String> + Send + TagValue<T>,

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fn from(tag: Tag<T>) -> Self

Converts to this type from the input type.
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impl<T> From<Tag<T>> for Tag
where T: Debug + Clone + PartialEq + Eq + Into<String> + Send + TagValue<T>,

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fn from(tag: Tag<T>) -> Self

Converts to this type from the input type.
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impl<T> From<Tag<T>> for Tag
where T: Debug + Clone + PartialEq + Eq + Into<String> + Send + TagValue<T>,

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fn from(tag: Tag<T>) -> Self

Converts to this type from the input type.
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impl<T> PartialEq for Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T> + PartialEq,

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fn eq(&self, other: &Tag<T>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> TryFrom<RawTag> for Tag<T>
where T: Clone + PartialEq + Eq + Debug + Send + TagValue<T, Error = ParseTagValueError>,

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type Error = ParseTagValueError

The type returned in the event of a conversion error.
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fn try_from(tag: RawTag) -> Result<Self, Self::Error>

Performs the conversion.
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impl<T> Eq for Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T> + Eq,

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impl<T> StructuralPartialEq for Tag<T>
where T: Debug + Clone + PartialEq + Eq + Send + TagValue<T>,

Auto Trait Implementations§

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impl<T> Freeze for Tag<T>
where T: Freeze,

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

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impl<T> Send for Tag<T>

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

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

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

Blanket Implementations§

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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<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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<Unshared, Shared> IntoShared<Shared> for Unshared
where Shared: FromUnshared<Unshared>,

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fn into_shared(self) -> Shared

Creates a shared type from an unshared type.
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impl<T> Same for T

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type Output = T

Should always be Self
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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
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impl<T> ErasedDestructor for T
where T: 'static,