Enum RequiredComponentsError 

#[non_exhaustive]
pub enum RequiredComponentsError {
    DuplicateRegistration(ComponentId, ComponentId),
    CyclicRequirement(ComponentId, ComponentId),
    ArchetypeExists(ComponentId),
}

An error returned when the registration of a required component fails.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

DuplicateRegistration(ComponentId, ComponentId)

The component is already a directly required component for the requiree.

CyclicRequirement(ComponentId, ComponentId)

Adding the given requirement would create a cycle.

ArchetypeExists(ComponentId)

An archetype with the component that requires other components already exists

Trait Implementations

impl Debug for RequiredComponentsError

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

Formats the value using the given formatter.

impl Display for RequiredComponentsError

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

Formats the value using the given formatter.

impl Error for RequiredComponentsError

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.