Struct FnKey

pub struct FnKey<T, F>
where
    F: FnOnce() -> Cow<'static, str>,
{ /* private fields */ }

Partially constructed context (missing value) for Result<T>.

Implementations

impl<T, F> FnKey<T, F>

where F: FnOnce() -> Cow<'static, str>,

pub fn new(builder: Result<T>, key: F) -> Self

Save off a key for a context that will be added to builder.

pub fn value<S>(self, value: S) -> Result<T>

where S: Into<Cow<'static, str>>,

Finish creating context and add it to Result<T>.

pub fn value_with<V>(self, value: V) -> Result<T>

where V: FnOnce() -> Cow<'static, str>,

Finish creating context and add it to Result<T>.