From 7321f25174c64350fbc91f3fcb580cb1cb189b4e Mon Sep 17 00:00:00 2001
From: Winston Hartnett <winstonhartnett@gmail.com>
Date: Sat, 7 Jan 2023 03:38:44 -0600
Subject: [PATCH] Expose SystemMeta field accessors (#5497)

---
 crates/bevy_ecs/src/system/function_system.rs | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/crates/bevy_ecs/src/system/function_system.rs b/crates/bevy_ecs/src/system/function_system.rs
index 2cc88f9e30b77..bd7b25ee41120 100644
--- a/crates/bevy_ecs/src/system/function_system.rs
+++ b/crates/bevy_ecs/src/system/function_system.rs
@@ -43,6 +43,36 @@ impl SystemMeta {
         &self.name
     }
 
+    /// Returns the system's component access set.
+    #[inline]
+    pub fn component_access_set(&self) -> &FilteredAccessSet<ComponentId> {
+        &self.component_access_set
+    }
+
+    /// Returns a mutable reference to the system's component access set.
+    ///
+    /// # Safety
+    /// This allows unsafe modifications to the component access set that can violate Bevy's scheduling soundness.
+    #[inline]
+    pub unsafe fn component_access_set_mut(&mut self) -> &mut FilteredAccessSet<ComponentId> {
+        &mut self.component_access_set
+    }
+
+    /// Returns the system's archetype component access set.
+    #[inline]
+    pub fn archetype_component_access(&self) -> &Access<ArchetypeComponentId> {
+        &self.archetype_component_access
+    }
+
+    /// Returns a mutable reference to this system's archetype component access set.
+    ///
+    /// # Safety
+    /// This allows unsafe modifications to the archetype component access set that can violate Bevy's scheduling soundness.
+    #[inline]
+    pub unsafe fn archetype_component_access_mut(&mut self) -> &mut Access<ArchetypeComponentId> {
+        &mut self.archetype_component_access
+    }
+
     /// Returns true if the system is [`Send`].
     #[inline]
     pub fn is_send(&self) -> bool {
@@ -56,6 +86,18 @@ impl SystemMeta {
     pub fn set_non_send(&mut self) {
         self.is_send = false;
     }
+
+    /// Returns this system's last change tick.
+    #[inline]
+    pub fn last_change_tick(&self) -> u32 {
+        self.last_change_tick
+    }
+
+    /// Set this system's last change tick.
+    #[inline]
+    pub fn set_last_change_tick(&mut self, last_change_tick: u32) {
+        self.last_change_tick = last_change_tick;
+    }
 }
 
 // TODO: Actually use this in FunctionSystem. We should probably only do this once Systems are constructed using a World reference