Struct CallbackDisposition

pub struct CallbackDisposition<'a, T> {
    pub handler_was_defined: bool,
    pub result: Option<T>,
    pub event_name: &'a str,
}

Allows reasoning about the result of a callback to decide how to interpret the result

Fields

handler_was_defined: bool

Indicates whether the handler was found. If false, then result will also be None. If true and result.is_none(), it indicates that none of the handlers returned a value.

result: Option<T>

The result!

event_name: &'a str

Which event was called (or to be called)

Implementations

impl<'a, T> CallbackDisposition<'a, T>

pub fn require_value(self) -> Result<T>

Requires that a value be returned. Translates the disposition into appropriate error messaging if no value was returned.

impl<'a, T: Default> CallbackDisposition<'a, T>

pub fn or_default(self) -> T

Unwraps the value type, or the Default impl if no value was returned