Enum ExactlyOneError 

pub enum ExactlyOneError {
    Empty,
    MoreThanOne(usize),
}

Error produced when expecting exactly one node from a query

Variants

Empty

The query resulted in an empty NodeList

MoreThanOne(usize)

The query resulted in a NodeList containing more than one node

Implementations

impl ExactlyOneError

pub fn is_empty(&self) -> bool

Check that it is the Empty variant

pub fn is_more_than_one(&self) -> bool

Check that it is the MoreThanOne variant

pub fn as_more_than_one(&self) -> Option<usize>

Extract the number of nodes, if it was more than one, or None otherwise

Trait Implementations

impl Debug for ExactlyOneError

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

Formats the value using the given formatter.

impl Display for ExactlyOneError

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

Formats the value using the given formatter.

impl Error for ExactlyOneError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.