Struct metered::ErrorCount

pub struct ErrorCount<C: Counter = AtomicInt<u64>>(pub C);

A metric counting how many times an expression typed std Result as returned an Err variant.

This is a light-weight metric.

By default, ErrorCount uses a lock-free u64 Counter, which makes sense in multithread scenarios. Non-threaded applications can gain performance by using a std::cell:Cell<u64> instead.

Trait Implementations

impl<C: Counter> Clear for ErrorCount<C>

fn clear(&self)

Requests to clear self.

impl<C: Clone + Counter> Clone for ErrorCount<C>

fn clone(&self) -> ErrorCount<C>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<C: Debug + Counter> Debug for ErrorCount<C>

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

Formats the value using the given formatter.

impl<C: Default + Counter> Default for ErrorCount<C>

fn default() -> ErrorCount<C>

Returns the "default value" for a type.

impl<C: Counter> Deref for ErrorCount<C>

type Target = C

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<C: Counter> Enter for ErrorCount<C>

type E = ()

The type returned by the enter function and carried to OnResult

fn enter(&self)

enter is called when entering in an aspect

impl<C: Counter, T, E> Metric<Result<T, E>> for ErrorCount<C>

impl<C: Counter, T, E> OnResult<Result<T, E>> for ErrorCount<C>

fn on_result(&self, _: (), r: &Result<T, E>) -> Advice

Called when an expression has returned.

fn leave_scope(&self, _enter: Self::E) -> Advice

Called when an expression has exited, but the return value isn't known. This can happen because of a panic, or if control flow bypasses a macro. This is also called by the default implementation of on_result.

impl<C: Counter> Serialize for ErrorCount<C> where
    C: Serialize, 

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.