Struct tracing_subscriber::fmt::writer::BoxMakeWriter[][src]

pub struct BoxMakeWriter { /* fields omitted */ }

A writer that erases the specific io::Write and Makewriter types being used.

This is useful in cases where the concrete type of the writer cannot be known until runtime.

Examples

A function that returns a Subscriber that will write to either stdout or stderr:


fn dynamic_writer(use_stderr: bool) -> impl Subscriber {
    let writer = if use_stderr {
        BoxMakeWriter::new(std::io::stderr)
    } else {
        BoxMakeWriter::new(std::io::stdout)
    };

    tracing_subscriber::fmt().with_writer(writer).finish()
}

Implementations

impl BoxMakeWriter[src]

pub fn new<M>(make_writer: M) -> Self where
    M: MakeWriter + Send + Sync + 'static,
    M::Writer: Write + 'static, 
[src]

Constructs a BoxMakeWriter wrapping a type implementing MakeWriter.

Trait Implementations

impl Debug for BoxMakeWriter[src]

impl MakeWriter for BoxMakeWriter[src]

type Writer = Box<dyn Write>

The concrete io::Write implementation returned by make_writer. Read more

Auto Trait Implementations

impl !RefUnwindSafe for BoxMakeWriter

impl Send for BoxMakeWriter

impl Sync for BoxMakeWriter

impl Unpin for BoxMakeWriter

impl !UnwindSafe for BoxMakeWriter

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T> Instrument for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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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.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.