Struct LazyString 

pub struct LazyString<F>(/* private fields */)
where
    F: Fn(&mut Formatter<'_>) -> Result<(), Error>;

A struct used to lazily defer creation of custom async logging messages until we know that the message is actually needed.

Context

Logging in the async context explicitly requires passing of a context pointer to enable CDB to determine the source of error message. To that end, a custom logging function is used.

The LazyString captures a lambda that constructs the logging message and implements std::fmt::Display, allowing string formatting to only be performed once we know a message needs to be logged.

Implementations

impl<F> LazyString<F>

where F: Fn(&mut Formatter<'_>) -> Result<(), Error>,

pub fn new(f: F) -> Self

Construct a new LazyString around the provided lambda.

Trait Implementations

impl<F> Display for LazyString<F>

where F: Fn(&mut Formatter<'_>) -> Result<(), Error>,

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

Formats the value using the given formatter.