Struct rfw::ecs::schedule::ReportExecutionOrderAmbiguities[−][src]

pub struct ReportExecutionOrderAmbiguities;

Expand description

When this resource is present in the AppBuilder’s Resources, each SystemStage will log a report containing pairs of systems with ambiguous execution order.

Systems that access the same Component or Resource within the same stage risk an ambiguous order that could result in logic bugs, unless they have an explicit execution ordering constraint between them.

This occurs because, in the absence of explicit constraints, systems are executed in an unstable, arbitrary order within each stage that may vary between runs and frames.

Some ambiguities reported by the ambiguity checker may be warranted (to allow two systems to run without blocking each other) or spurious, as the exact combination of archetypes used may prevent them from ever conflicting during actual gameplay. You can resolve the warnings produced by the ambiguity checker by adding .before or .after to one of the conflicting systems referencing the other system to force a specific ordering.

The checker may report a system more times than the amount of constraints it would actually need to have unambiguous order with regards to a group of already-constrained systems.

Auto Trait Implementations

impl RefUnwindSafe for ReportExecutionOrderAmbiguities

impl Send for ReportExecutionOrderAmbiguities

impl Sync for ReportExecutionOrderAmbiguities

impl Unpin for ReportExecutionOrderAmbiguities

impl UnwindSafe for ReportExecutionOrderAmbiguities

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