From d3de7416f7432dcb1021672c353ea4b63e152055 Mon Sep 17 00:00:00 2001
From: = <klimusha@gmail.com>
Date: Sat, 10 Jul 2021 01:03:55 +1000
Subject: [PATCH] Implement std::ops::Not for ShouldRun

---
 crates/bevy_ecs/src/schedule/run_criteria.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/crates/bevy_ecs/src/schedule/run_criteria.rs b/crates/bevy_ecs/src/schedule/run_criteria.rs
index f9f7edf3b2ef8..8230f767fd70d 100644
--- a/crates/bevy_ecs/src/schedule/run_criteria.rs
+++ b/crates/bevy_ecs/src/schedule/run_criteria.rs
@@ -44,6 +44,19 @@ pub enum ShouldRun {
     NoAndCheckAgain,
 }
 
+impl std::ops::Not for ShouldRun {
+    type Output = Self;
+
+    fn not(self) -> Self {
+        match self {
+            ShouldRun::Yes => ShouldRun::No,
+            ShouldRun::No => ShouldRun::Yes,
+            ShouldRun::YesAndCheckAgain => ShouldRun::NoAndCheckAgain,
+            ShouldRun::NoAndCheckAgain => ShouldRun::YesAndCheckAgain,
+        }
+    }
+}
+
 pub(crate) struct BoxedRunCriteria {
     criteria_system: Option<BoxedSystem<(), ShouldRun>>,
     initialized: bool,