Struct Flag

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pub struct Flag { /* private fields */ }
Expand description

Flag histograms.

This histogram has only two states. Until the first call to record(), it is unset. Once record() has been called once, it is set and won’t change anymore. This type is useful if you need to track whether a feature was ever used during a session.

With SerializationFormat::SimpleJson, these histograms are serialized as a plain number 0 (unset)/1 (set).

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impl Flag

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pub fn new(service: &Service, name: String) -> Flag

Create a new Flag histogram with a given name.

Argument name is used as key when processing and exporting the data. Each name must be unique to the Service.

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If name is already used by another histogram in service.

Trait Implementations§

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impl Clone for Flag

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fn clone(&self) -> Self

Returns a duplicate 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 Histogram<()> for Flag

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fn record_cb<F>(&self, cb: F)
where F: FnOnce() -> Option<()>,

Record a value in this histogram, as provided by a callback. Read more
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fn record(&self, value: T)

Record a value in this histogram. Read more

Auto Trait Implementations§

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impl !Freeze for Flag

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impl RefUnwindSafe for Flag

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impl Send for Flag

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impl Sync for Flag

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impl Unpin for Flag

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impl UnwindSafe for Flag

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<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<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> 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.