Module system_condition 

Structs

And

Runs only while both A and B would run.

Conditional

Wraps a System, skipping it for a tick whenever C::should_run returns false.

ConditionalFn

Wraps a System, skipping it for a tick whenever cond returns false. The closure-based counterpart to Conditional — see RunIfFnExt::run_if_fn.

ConditionalSet

Or

Runs while either A or B would run.

ResourceExists

Runs only while resource T exists.

RunIfFnSystem

RunIfSystem

Traits

RunCondition

A predicate checked before a system runs. If should_run returns false, the wrapped system’s body is skipped entirely for that tick — its SystemParams are never fetched.

RunIfExt

Adds .run_if to anything convertible into a System, gating it on a RunCondition.

RunIfFnExt

Adds .run_if_fn to anything convertible into a System, gating it on a plain closure instead of a RunCondition type — no struct/impl boilerplate needed for a one-off check:

SystemSetRunIfExt

Adds .run_if to an entire IntoSystemSet tuple at once, applying the same condition to every system in it.