Enum ScheduleBuildError 

#[non_exhaustive]
pub enum ScheduleBuildError {
    HierarchyLoop(NodeId),
    HierarchyCycle(Vec<Vec<NodeId>>),
    DependencyLoop(NodeId),
    DependencyCycle(Vec<Vec<NodeId>>),
    CrossDependency(NodeId, NodeId),
    SetsHaveOrderButIntersect(SystemSetKey, SystemSetKey),
    SystemTypeSetAmbiguity(SystemSetKey),
    Uninitialized,
    Elevated(ScheduleBuildWarning),
}

Category of errors encountered during Schedule::initialize.

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.

HierarchyLoop(NodeId)

A system set contains itself.

HierarchyCycle(Vec<Vec<NodeId>>)

The hierarchy of system sets contains a cycle.

DependencyLoop(NodeId)

A system (set) has been told to run before itself.

DependencyCycle(Vec<Vec<NodeId>>)

The dependency graph contains a cycle.

CrossDependency(NodeId, NodeId)

Tried to order a system (set) relative to a system set it belongs to.

SetsHaveOrderButIntersect(SystemSetKey, SystemSetKey)

Tried to order system sets that share systems.

SystemTypeSetAmbiguity(SystemSetKey)

Tried to order a system (set) relative to all instances of some system function.

Uninitialized

Tried to run a schedule before all of its systems have been initialized.

Elevated(ScheduleBuildWarning)

A warning that was elevated to an error.

Implementations

impl ScheduleBuildError

pub fn to_string(&self, graph: &ScheduleGraph, world: &World) -> String

Renders the error as a human-readable string with node identifiers replaced with their names.

The given graph and world are used to resolve the names of the nodes and components involved in the error. The same graph and world should be used as those used to initialize the Schedule. Failure to do so will result in incorrect or incomplete error messages.

Trait Implementations

impl Debug for ScheduleBuildError

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

Formats the value using the given formatter.

impl Display for ScheduleBuildError

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

Formats the value using the given formatter.

impl Error for ScheduleBuildError

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 From<ScheduleBuildWarning> for ScheduleBuildError

fn from(source: ScheduleBuildWarning) -> Self

Converts to this type from the input type.