Enum QueryEntityError

pub enum QueryEntityError<'w> {
    QueryDoesNotMatch(Entity, UnsafeWorldCell<'w>),
    NoSuchEntity(Entity),
    AliasedMutability(Entity),
}

An error that occurs when retrieving a specific Entity’s query result from Query or QueryState.

Variants

QueryDoesNotMatch(Entity, UnsafeWorldCell<'w>)

The given Entity’s components do not match the query.

Either it does not have a requested component, or it has a component which the query filters out.

NoSuchEntity(Entity)

The given Entity does not exist.

AliasedMutability(Entity)

The Entity was requested mutably more than once.

See QueryState::get_many_mut for an example.

Trait Implementations

impl<'w> Clone for QueryEntityError<'w>

fn clone(&self) -> QueryEntityError<'w>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'w> Debug for QueryEntityError<'w>

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

Formats the value using the given formatter.

impl<'w> Display for QueryEntityError<'w>

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

Formats the value using the given formatter.

impl<'w> Error for QueryEntityError<'w>

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.

impl<'w> PartialEq for QueryEntityError<'w>

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'w> Copy for QueryEntityError<'w>

impl<'w> Eq for QueryEntityError<'w>