pub type OptionalWriter<T> = EitherWriter<T, Sink>;
Available on crate features
fmt
and std
only.Expand description
A writer which may or may not be enabled.
This may be used by MakeWriter
implementations that wish to
conditionally enable or disable the returned writer based on a span or
event’s Metadata
.
Aliased Type§
enum OptionalWriter<T> {
A(T),
B(Sink),
}
Variants§
Implementations§
Source§impl<T> OptionalWriter<T>
impl<T> OptionalWriter<T>
Sourcepub fn none() -> Self
pub fn none() -> Self
Returns a disabled writer.
Any bytes written to the returned writer are discarded.
This is equivalent to returning Option::None
.
Sourcepub fn some(t: T) -> Self
pub fn some(t: T) -> Self
Returns an enabled writer of type T
.
This is equivalent to returning Option::Some
.
Trait Implementations§
Layout§
Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.